/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_1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-d966a43 [2022-01-31 21:18:52,363 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-31 21:18:52,365 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-31 21:18:52,421 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-01-31 21:18:52,452 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-31 21:18:52,452 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-31 21:18:52,453 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-31 21:18:52,454 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 21:18:52,461 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-31 21:18:52,461 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-31 21:18:52,462 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-31 21:18:52,462 INFO L138 SettingsManager]: * sizeof long=4 [2022-01-31 21:18:52,463 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-31 21:18:52,463 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-01-31 21:18:52,463 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-31 21:18:52,463 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-31 21:18:52,463 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-31 21:18:52,463 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-31 21:18:52,464 INFO L138 SettingsManager]: * sizeof long double=12 [2022-01-31 21:18:52,464 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-31 21:18:52,464 INFO L138 SettingsManager]: * Use constant arrays=true [2022-01-31 21:18:52,464 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-31 21:18:52,464 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-31 21:18:52,465 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-31 21:18:52,465 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-01-31 21:18:52,465 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-31 21:18:52,465 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 21:18:52,465 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-31 21:18:52,465 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-01-31 21:18:52,466 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-31 21:18:52,466 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-01-31 21:18:52,466 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-31 21:18:52,677 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-31 21:18:52,704 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-31 21:18:52,706 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-31 21:18:52,707 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-31 21:18:52,708 INFO L275 PluginConnector]: CDTParser initialized [2022-01-31 21:18:52,709 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_1.c [2022-01-31 21:18:52,761 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b2d9179d2/16f16f4df73d4593b89eb2209b4ffa61/FLAGb6eacd28d [2022-01-31 21:18:53,135 INFO L306 CDTParser]: Found 1 translation units. [2022-01-31 21:18:53,136 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_1.c [2022-01-31 21:18:53,143 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b2d9179d2/16f16f4df73d4593b89eb2209b4ffa61/FLAGb6eacd28d [2022-01-31 21:18:53,157 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b2d9179d2/16f16f4df73d4593b89eb2209b4ffa61 [2022-01-31 21:18:53,159 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-31 21:18:53,162 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-01-31 21:18:53,166 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-31 21:18:53,166 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-31 21:18:53,169 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-31 21:18:53,169 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 09:18:53" (1/1) ... [2022-01-31 21:18:53,170 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6841019a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:18:53, skipping insertion in model container [2022-01-31 21:18:53,170 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 09:18:53" (1/1) ... [2022-01-31 21:18:53,176 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-31 21:18:53,187 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-31 21:18:53,318 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_1.c[318,331] [2022-01-31 21:18:53,335 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 21:18:53,341 INFO L203 MainTranslator]: Completed pre-run [2022-01-31 21:18:53,351 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_1.c[318,331] [2022-01-31 21:18:53,353 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 21:18:53,381 INFO L208 MainTranslator]: Completed translation [2022-01-31 21:18:53,382 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:18:53 WrapperNode [2022-01-31 21:18:53,382 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-31 21:18:53,383 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-31 21:18:53,383 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-31 21:18:53,391 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-31 21:18:53,400 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:18:53" (1/1) ... [2022-01-31 21:18:53,400 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:18:53" (1/1) ... [2022-01-31 21:18:53,416 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:18:53" (1/1) ... [2022-01-31 21:18:53,416 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:18:53" (1/1) ... [2022-01-31 21:18:53,420 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:18:53" (1/1) ... [2022-01-31 21:18:53,422 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:18:53" (1/1) ... [2022-01-31 21:18:53,429 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:18:53" (1/1) ... [2022-01-31 21:18:53,435 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-31 21:18:53,435 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-31 21:18:53,435 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-31 21:18:53,436 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-31 21:18:53,437 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:18:53" (1/1) ... [2022-01-31 21:18:53,443 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 21:18:53,453 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 21:18:53,462 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 21:18:53,476 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 21:18:53,499 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-01-31 21:18:53,499 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-31 21:18:53,499 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-01-31 21:18:53,499 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-01-31 21:18:53,500 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-01-31 21:18:53,500 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-01-31 21:18:53,500 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-01-31 21:18:53,500 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-01-31 21:18:53,501 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-31 21:18:53,501 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-01-31 21:18:53,502 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-01-31 21:18:53,502 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-01-31 21:18:53,502 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-01-31 21:18:53,502 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-31 21:18:53,507 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-01-31 21:18:53,509 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-01-31 21:18:53,509 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-31 21:18:53,565 INFO L234 CfgBuilder]: Building ICFG [2022-01-31 21:18:53,567 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-31 21:18:53,705 INFO L275 CfgBuilder]: Performing block encoding [2022-01-31 21:18:53,724 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-31 21:18:53,725 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-01-31 21:18:53,726 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 09:18:53 BoogieIcfgContainer [2022-01-31 21:18:53,726 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-31 21:18:53,728 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-31 21:18:53,728 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-31 21:18:53,738 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-31 21:18:53,739 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.01 09:18:53" (1/3) ... [2022-01-31 21:18:53,739 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5678ce8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 09:18:53, skipping insertion in model container [2022-01-31 21:18:53,739 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:18:53" (2/3) ... [2022-01-31 21:18:53,740 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5678ce8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 09:18:53, skipping insertion in model container [2022-01-31 21:18:53,740 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 09:18:53" (3/3) ... [2022-01-31 21:18:53,741 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_1.c [2022-01-31 21:18:53,747 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-01-31 21:18:53,748 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-31 21:18:53,807 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-31 21:18:53,812 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 21:18:53,813 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-31 21:18:53,823 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 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 21:18:53,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-01-31 21:18:53,829 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:18:53,829 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:18:53,829 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:18:53,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:18:53,833 INFO L85 PathProgramCache]: Analyzing trace with hash -1168619535, now seen corresponding path program 1 times [2022-01-31 21:18:53,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:18:53,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1229586852] [2022-01-31 21:18:53,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:18:53,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:18:53,927 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 21:18:53,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:54,037 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:18:54,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:54,055 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 21:18:54,056 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:18:54,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1229586852] [2022-01-31 21:18:54,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1229586852] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:18:54,060 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:18:54,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-31 21:18:54,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883031109] [2022-01-31 21:18:54,062 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:18:54,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-31 21:18:54,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:18:54,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-31 21:18:54,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-31 21:18:54,096 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 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 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:54,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:18:54,145 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2022-01-31 21:18:54,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-31 21:18:54,148 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-01-31 21:18:54,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:18:54,158 INFO L225 Difference]: With dead ends: 34 [2022-01-31 21:18:54,158 INFO L226 Difference]: Without dead ends: 14 [2022-01-31 21:18:54,161 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 21:18:54,165 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 14 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 25 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 21:18:54,166 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 25 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:18:54,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-01-31 21:18:54,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-01-31 21:18:54,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:54,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2022-01-31 21:18:54,199 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 12 [2022-01-31 21:18:54,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:18:54,199 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2022-01-31 21:18:54,200 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:54,200 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2022-01-31 21:18:54,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-01-31 21:18:54,201 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:18:54,201 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:18:54,201 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-31 21:18:54,201 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:18:54,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:18:54,202 INFO L85 PathProgramCache]: Analyzing trace with hash -1458605129, now seen corresponding path program 1 times [2022-01-31 21:18:54,202 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:18:54,203 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1021091711] [2022-01-31 21:18:54,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:18:54,204 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:18:54,207 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 21:18:54,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:54,271 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:18:54,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:54,287 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:18:54,288 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:18:54,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1021091711] [2022-01-31 21:18:54,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1021091711] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:18:54,289 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:18:54,289 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-01-31 21:18:54,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21773380] [2022-01-31 21:18:54,290 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:18:54,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-01-31 21:18:54,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:18:54,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-01-31 21:18:54,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-01-31 21:18:54,294 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:54,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:18:54,340 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2022-01-31 21:18:54,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-01-31 21:18:54,341 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-01-31 21:18:54,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:18:54,341 INFO L225 Difference]: With dead ends: 24 [2022-01-31 21:18:54,341 INFO L226 Difference]: Without dead ends: 16 [2022-01-31 21:18:54,345 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 21:18:54,346 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 12 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 21 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 21:18:54,346 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 21 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:18:54,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-01-31 21:18:54,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-01-31 21:18:54,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 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 21:18:54,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2022-01-31 21:18:54,357 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2022-01-31 21:18:54,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:18:54,358 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2022-01-31 21:18:54,358 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:54,359 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2022-01-31 21:18:54,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-01-31 21:18:54,359 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:18:54,359 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:18:54,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-01-31 21:18:54,360 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:18:54,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:18:54,361 INFO L85 PathProgramCache]: Analyzing trace with hash -1316432198, now seen corresponding path program 1 times [2022-01-31 21:18:54,361 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:18:54,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1267424844] [2022-01-31 21:18:54,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:18:54,472 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:54,478 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:18:54,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:18:54,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:54,547 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:18:54,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:54,564 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:18:54,613 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:18:54,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1267424844] [2022-01-31 21:18:54,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1267424844] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:18:54,614 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:18:54,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-01-31 21:18:54,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972164676] [2022-01-31 21:18:54,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:18:54,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-01-31 21:18:54,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:18:54,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-01-31 21:18:54,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-01-31 21:18:54,616 INFO L87 Difference]: Start difference. First operand 16 states and 18 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 21:18:54,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:18:54,698 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2022-01-31 21:18:54,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-01-31 21:18:54,698 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 21:18:54,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:18:54,699 INFO L225 Difference]: With dead ends: 26 [2022-01-31 21:18:54,699 INFO L226 Difference]: Without dead ends: 20 [2022-01-31 21:18:54,700 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2022-01-31 21:18:54,707 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 15 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:18:54,708 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 19 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:18:54,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-01-31 21:18:54,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-01-31 21:18:54,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 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 21:18:54,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2022-01-31 21:18:54,718 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 14 [2022-01-31 21:18:54,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:18:54,718 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2022-01-31 21:18:54,718 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 21:18:54,719 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-01-31 21:18:54,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-01-31 21:18:54,720 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:18:54,720 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:18:54,720 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-01-31 21:18:54,720 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:18:54,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:18:54,721 INFO L85 PathProgramCache]: Analyzing trace with hash -1342594849, now seen corresponding path program 1 times [2022-01-31 21:18:54,721 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:18:54,721 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049380712] [2022-01-31 21:18:54,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:18:54,899 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 21:18:54,952 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:54,952 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:55,002 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:55,110 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 21:18:55,110 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:55,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:18:55,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:55,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:18:55,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:55,261 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:18:55,392 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:18:55,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2049380712] [2022-01-31 21:18:55,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2049380712] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:18:55,393 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:18:55,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-01-31 21:18:55,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718726690] [2022-01-31 21:18:55,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:18:55,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-01-31 21:18:55,394 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:18:55,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-01-31 21:18:55,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-01-31 21:18:55,394 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:55,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:18:55,531 INFO L93 Difference]: Finished difference Result 38 states and 48 transitions. [2022-01-31 21:18:55,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-01-31 21:18:55,531 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-01-31 21:18:55,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:18:55,532 INFO L225 Difference]: With dead ends: 38 [2022-01-31 21:18:55,532 INFO L226 Difference]: Without dead ends: 26 [2022-01-31 21:18:55,533 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2022-01-31 21:18:55,533 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 14 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:18:55,534 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 45 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:18:55,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-01-31 21:18:55,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-01-31 21:18:55,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 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 21:18:55,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2022-01-31 21:18:55,539 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 19 [2022-01-31 21:18:55,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:18:55,540 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2022-01-31 21:18:55,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:55,540 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2022-01-31 21:18:55,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-01-31 21:18:55,540 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:18:55,541 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:18:55,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-01-31 21:18:55,541 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:18:55,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:18:55,541 INFO L85 PathProgramCache]: Analyzing trace with hash 952217402, now seen corresponding path program 2 times [2022-01-31 21:18:55,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:18:55,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [161017128] [2022-01-31 21:18:55,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:18:55,615 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:55,658 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:55,659 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:55,689 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:55,753 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 21:18:55,754 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:55,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:18:55,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:55,838 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:18:55,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:55,846 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:18:56,002 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:18:56,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [161017128] [2022-01-31 21:18:56,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [161017128] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:18:56,003 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:18:56,003 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-01-31 21:18:56,003 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507764592] [2022-01-31 21:18:56,003 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:18:56,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-01-31 21:18:56,004 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:18:56,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-01-31 21:18:56,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2022-01-31 21:18:56,004 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:56,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:18:56,174 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2022-01-31 21:18:56,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-01-31 21:18:56,175 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-01-31 21:18:56,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:18:56,175 INFO L225 Difference]: With dead ends: 41 [2022-01-31 21:18:56,175 INFO L226 Difference]: Without dead ends: 29 [2022-01-31 21:18:56,176 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2022-01-31 21:18:56,177 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 25 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:18:56,177 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 40 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:18:56,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-01-31 21:18:56,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-01-31 21:18:56,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 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 21:18:56,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2022-01-31 21:18:56,186 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 21 [2022-01-31 21:18:56,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:18:56,186 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2022-01-31 21:18:56,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:56,186 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2022-01-31 21:18:56,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-01-31 21:18:56,187 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:18:56,187 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:18:56,187 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-01-31 21:18:56,187 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:18:56,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:18:56,188 INFO L85 PathProgramCache]: Analyzing trace with hash 1246825262, now seen corresponding path program 3 times [2022-01-31 21:18:56,188 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:18:56,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1114657598] [2022-01-31 21:18:56,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:18:56,262 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 21:18:56,294 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:56,294 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:56,325 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:56,389 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 21:18:56,390 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:56,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:18:56,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:56,483 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:18:56,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:56,488 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:18:56,628 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:18:56,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1114657598] [2022-01-31 21:18:56,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1114657598] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:18:56,629 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:18:56,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-01-31 21:18:56,629 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485198234] [2022-01-31 21:18:56,629 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:18:56,630 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-01-31 21:18:56,630 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:18:56,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-01-31 21:18:56,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=146, Unknown=0, NotChecked=0, Total=210 [2022-01-31 21:18:56,630 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:56,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:18:56,812 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2022-01-31 21:18:56,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-01-31 21:18:56,812 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-01-31 21:18:56,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:18:56,813 INFO L225 Difference]: With dead ends: 45 [2022-01-31 21:18:56,813 INFO L226 Difference]: Without dead ends: 32 [2022-01-31 21:18:56,814 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=149, Invalid=403, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:18:56,814 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 30 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:18:56,815 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 30 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:18:56,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-01-31 21:18:56,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-01-31 21:18:56,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 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 21:18:56,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2022-01-31 21:18:56,822 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 24 [2022-01-31 21:18:56,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:18:56,822 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2022-01-31 21:18:56,822 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:56,823 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2022-01-31 21:18:56,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-01-31 21:18:56,823 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:18:56,823 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:18:56,823 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-01-31 21:18:56,824 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:18:56,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:18:56,824 INFO L85 PathProgramCache]: Analyzing trace with hash 969620496, now seen corresponding path program 4 times [2022-01-31 21:18:56,824 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:18:56,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [94991887] [2022-01-31 21:18:56,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:18:56,876 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:56,906 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:56,906 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:56,929 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:56,984 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:56,984 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:56,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:18:56,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:57,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:18:57,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:57,051 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:18:57,186 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:18:57,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [94991887] [2022-01-31 21:18:57,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [94991887] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:18:57,186 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:18:57,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-01-31 21:18:57,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340113026] [2022-01-31 21:18:57,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:18:57,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-01-31 21:18:57,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:18:57,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-01-31 21:18:57,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2022-01-31 21:18:57,188 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:57,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:18:57,414 INFO L93 Difference]: Finished difference Result 57 states and 75 transitions. [2022-01-31 21:18:57,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-01-31 21:18:57,414 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-01-31 21:18:57,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:18:57,414 INFO L225 Difference]: With dead ends: 57 [2022-01-31 21:18:57,415 INFO L226 Difference]: Without dead ends: 43 [2022-01-31 21:18:57,415 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=189, Invalid=411, Unknown=0, NotChecked=0, Total=600 [2022-01-31 21:18:57,416 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 34 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:18:57,416 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 29 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:18:57,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-01-31 21:18:57,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 33. [2022-01-31 21:18:57,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:57,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2022-01-31 21:18:57,424 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 27 [2022-01-31 21:18:57,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:18:57,424 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2022-01-31 21:18:57,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:57,424 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2022-01-31 21:18:57,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-01-31 21:18:57,425 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:18:57,425 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:18:57,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-01-31 21:18:57,431 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:18:57,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:18:57,432 INFO L85 PathProgramCache]: Analyzing trace with hash -777622499, now seen corresponding path program 5 times [2022-01-31 21:18:57,433 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:18:57,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [336747757] [2022-01-31 21:18:57,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:18:57,499 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 21:18:57,523 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:57,523 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:57,553 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:57,604 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 21:18:57,604 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:57,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:18:57,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:57,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:18:57,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:57,712 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:18:57,931 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:18:57,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [336747757] [2022-01-31 21:18:57,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [336747757] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:18:57,932 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:18:57,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-01-31 21:18:57,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119310220] [2022-01-31 21:18:57,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:18:57,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-01-31 21:18:57,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:18:57,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-01-31 21:18:57,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=317, Unknown=0, NotChecked=0, Total=380 [2022-01-31 21:18:57,934 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 16 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 21:18:58,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:18:58,244 INFO L93 Difference]: Finished difference Result 74 states and 84 transitions. [2022-01-31 21:18:58,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-01-31 21:18:58,245 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 16 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 21:18:58,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:18:58,246 INFO L225 Difference]: With dead ends: 74 [2022-01-31 21:18:58,246 INFO L226 Difference]: Without dead ends: 49 [2022-01-31 21:18:58,246 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=700, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:18:58,247 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 19 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:18:58,247 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 70 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:18:58,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-01-31 21:18:58,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-01-31 21:18:58,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 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 21:18:58,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2022-01-31 21:18:58,256 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 32 [2022-01-31 21:18:58,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:18:58,256 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2022-01-31 21:18:58,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 16 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 21:18:58,256 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2022-01-31 21:18:58,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-01-31 21:18:58,257 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:18:58,257 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:18:58,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-01-31 21:18:58,257 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:18:58,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:18:58,257 INFO L85 PathProgramCache]: Analyzing trace with hash 951830946, now seen corresponding path program 6 times [2022-01-31 21:18:58,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:18:58,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1010430796] [2022-01-31 21:18:58,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:18:58,311 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:58,340 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:58,340 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:58,378 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:58,437 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 21:18:58,438 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:58,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:18:58,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:58,572 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:18:58,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:58,583 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:18:58,790 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:18:58,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1010430796] [2022-01-31 21:18:58,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1010430796] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:18:58,791 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:18:58,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-01-31 21:18:58,791 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324909830] [2022-01-31 21:18:58,791 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:18:58,791 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-01-31 21:18:58,792 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:18:58,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-01-31 21:18:58,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=297, Unknown=0, NotChecked=0, Total=420 [2022-01-31 21:18:58,792 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:59,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:18:59,163 INFO L93 Difference]: Finished difference Result 77 states and 87 transitions. [2022-01-31 21:18:59,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-01-31 21:18:59,170 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2022-01-31 21:18:59,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:18:59,171 INFO L225 Difference]: With dead ends: 77 [2022-01-31 21:18:59,173 INFO L226 Difference]: Without dead ends: 52 [2022-01-31 21:18:59,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 335 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=314, Invalid=946, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:18:59,174 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 41 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:18:59,174 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 60 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:18:59,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-01-31 21:18:59,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-01-31 21:18:59,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 47 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:59,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2022-01-31 21:18:59,183 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 34 [2022-01-31 21:18:59,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:18:59,183 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2022-01-31 21:18:59,183 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:59,183 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2022-01-31 21:18:59,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-01-31 21:18:59,184 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:18:59,184 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:18:59,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-01-31 21:18:59,184 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:18:59,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:18:59,185 INFO L85 PathProgramCache]: Analyzing trace with hash -802576804, now seen corresponding path program 7 times [2022-01-31 21:18:59,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:18:59,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964751259] [2022-01-31 21:18:59,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:18:59,248 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 21:18:59,276 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:59,276 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:59,303 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:59,372 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 21:18:59,373 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:59,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:18:59,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:59,462 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:18:59,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:59,466 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:18:59,674 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:18:59,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964751259] [2022-01-31 21:18:59,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [964751259] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:18:59,675 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:18:59,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-01-31 21:18:59,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178594687] [2022-01-31 21:18:59,675 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:18:59,675 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-01-31 21:18:59,675 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:18:59,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-01-31 21:18:59,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2022-01-31 21:18:59,676 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 20 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:00,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:00,069 INFO L93 Difference]: Finished difference Result 88 states and 105 transitions. [2022-01-31 21:19:00,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-01-31 21:19:00,069 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 20 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-01-31 21:19:00,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:00,070 INFO L225 Difference]: With dead ends: 88 [2022-01-31 21:19:00,070 INFO L226 Difference]: Without dead ends: 62 [2022-01-31 21:19:00,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=435, Invalid=1047, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:19:00,071 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 59 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:00,072 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 19 Invalid, 331 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:19:00,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-01-31 21:19:00,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 44. [2022-01-31 21:19:00,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 states have internal predecessors, (43), 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 21:19:00,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2022-01-31 21:19:00,078 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 37 [2022-01-31 21:19:00,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:00,078 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2022-01-31 21:19:00,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 20 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:00,079 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2022-01-31 21:19:00,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-01-31 21:19:00,079 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:00,080 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:00,080 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-01-31 21:19:00,080 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:00,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:00,080 INFO L85 PathProgramCache]: Analyzing trace with hash 897664690, now seen corresponding path program 8 times [2022-01-31 21:19:00,080 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:00,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1247573542] [2022-01-31 21:19:00,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:00,133 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 21:19:00,159 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:00,160 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:00,182 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:00,246 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 21:19:00,246 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:00,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:00,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:00,387 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:00,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:00,392 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:00,660 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:00,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1247573542] [2022-01-31 21:19:00,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1247573542] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:00,661 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:00,661 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-01-31 21:19:00,661 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430340390] [2022-01-31 21:19:00,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:00,661 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-01-31 21:19:00,661 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:00,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-01-31 21:19:00,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=486, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:19:00,662 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand has 24 states, 24 states have (on average 1.625) internal successors, (39), 23 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:01,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:01,160 INFO L93 Difference]: Finished difference Result 105 states and 116 transitions. [2022-01-31 21:19:01,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-01-31 21:19:01,160 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.625) internal successors, (39), 23 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2022-01-31 21:19:01,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:01,161 INFO L225 Difference]: With dead ends: 105 [2022-01-31 21:19:01,161 INFO L226 Difference]: Without dead ends: 69 [2022-01-31 21:19:01,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 638 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=578, Invalid=1678, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:19:01,162 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 66 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:01,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 25 Invalid, 440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:19:01,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-01-31 21:19:01,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-01-31 21:19:01,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.078125) internal successors, (69), 64 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:01,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 73 transitions. [2022-01-31 21:19:01,172 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 73 transitions. Word has length 43 [2022-01-31 21:19:01,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:01,173 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 73 transitions. [2022-01-31 21:19:01,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.625) internal successors, (39), 23 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:01,173 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 73 transitions. [2022-01-31 21:19:01,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-01-31 21:19:01,174 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:01,174 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:01,174 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-01-31 21:19:01,174 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:01,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:01,174 INFO L85 PathProgramCache]: Analyzing trace with hash 1875513590, now seen corresponding path program 9 times [2022-01-31 21:19:01,175 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:01,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1886857639] [2022-01-31 21:19:01,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:01,238 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 21:19:01,270 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:01,270 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:01,292 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:01,360 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 21:19:01,361 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:01,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:01,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:01,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:01,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:01,551 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:01,872 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:01,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1886857639] [2022-01-31 21:19:01,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1886857639] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:01,872 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:01,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-01-31 21:19:01,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800553052] [2022-01-31 21:19:01,873 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:01,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-01-31 21:19:01,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:01,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-01-31 21:19:01,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=700, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:19:01,874 INFO L87 Difference]: Start difference. First operand 69 states and 73 transitions. Second operand has 26 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 25 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:02,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:02,409 INFO L93 Difference]: Finished difference Result 108 states and 117 transitions. [2022-01-31 21:19:02,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-01-31 21:19:02,409 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 25 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2022-01-31 21:19:02,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:02,410 INFO L225 Difference]: With dead ends: 108 [2022-01-31 21:19:02,410 INFO L226 Difference]: Without dead ends: 71 [2022-01-31 21:19:02,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=186, Invalid=1620, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:19:02,411 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 24 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 596 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 615 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:02,411 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 95 Invalid, 615 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 596 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:19:02,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-01-31 21:19:02,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-01-31 21:19:02,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 66 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 21:19:02,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 75 transitions. [2022-01-31 21:19:02,420 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 75 transitions. Word has length 46 [2022-01-31 21:19:02,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:02,420 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 75 transitions. [2022-01-31 21:19:02,420 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 25 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:02,421 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 75 transitions. [2022-01-31 21:19:02,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-01-31 21:19:02,421 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:02,421 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:02,421 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-01-31 21:19:02,422 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:02,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:02,422 INFO L85 PathProgramCache]: Analyzing trace with hash -1296637509, now seen corresponding path program 10 times [2022-01-31 21:19:02,422 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:02,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [600359759] [2022-01-31 21:19:02,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:02,474 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 21:19:02,508 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:02,509 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:02,539 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:02,602 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 21:19:02,602 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:02,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:02,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:02,724 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:02,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:02,742 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:02,981 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:02,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [600359759] [2022-01-31 21:19:02,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [600359759] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:02,981 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:02,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-01-31 21:19:02,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120067165] [2022-01-31 21:19:02,981 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:02,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-01-31 21:19:02,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:02,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-01-31 21:19:02,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=466, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:19:02,982 INFO L87 Difference]: Start difference. First operand 71 states and 75 transitions. Second operand has 27 states, 27 states have (on average 1.6296296296296295) internal successors, (44), 26 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:03,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:03,648 INFO L93 Difference]: Finished difference Result 117 states and 133 transitions. [2022-01-31 21:19:03,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-01-31 21:19:03,648 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.6296296296296295) internal successors, (44), 26 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2022-01-31 21:19:03,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:03,649 INFO L225 Difference]: With dead ends: 117 [2022-01-31 21:19:03,649 INFO L226 Difference]: Without dead ends: 80 [2022-01-31 21:19:03,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=702, Invalid=1848, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:19:03,650 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 89 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 591 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:03,650 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 24 Invalid, 591 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:19:03,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-01-31 21:19:03,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 54. [2022-01-31 21:19:03,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 49 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 21:19:03,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2022-01-31 21:19:03,656 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 48 [2022-01-31 21:19:03,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:03,657 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2022-01-31 21:19:03,657 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.6296296296296295) internal successors, (44), 26 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:03,657 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2022-01-31 21:19:03,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-01-31 21:19:03,657 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:03,657 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:03,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-01-31 21:19:03,658 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:03,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:03,658 INFO L85 PathProgramCache]: Analyzing trace with hash -1149355906, now seen corresponding path program 11 times [2022-01-31 21:19:03,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:03,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [111499489] [2022-01-31 21:19:03,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:03,726 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 21:19:03,759 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:03,759 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:03,789 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:03,837 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:03,837 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:03,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:03,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:04,004 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:04,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:04,008 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:04,321 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:04,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [111499489] [2022-01-31 21:19:04,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [111499489] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:04,321 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:04,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-01-31 21:19:04,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784992913] [2022-01-31 21:19:04,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:04,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-01-31 21:19:04,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:04,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-01-31 21:19:04,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=737, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:19:04,322 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 29 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 21:19:04,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:04,992 INFO L93 Difference]: Finished difference Result 133 states and 144 transitions. [2022-01-31 21:19:04,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:19:04,993 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 29 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 21:19:04,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:04,993 INFO L225 Difference]: With dead ends: 133 [2022-01-31 21:19:04,993 INFO L226 Difference]: Without dead ends: 87 [2022-01-31 21:19:04,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1013 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=875, Invalid=2665, Unknown=0, NotChecked=0, Total=3540 [2022-01-31 21:19:04,995 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 63 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 641 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 714 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 641 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:04,995 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 45 Invalid, 714 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 641 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:19:04,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-01-31 21:19:05,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2022-01-31 21:19:05,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0609756097560976) internal successors, (87), 82 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:05,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 91 transitions. [2022-01-31 21:19:05,017 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 91 transitions. Word has length 53 [2022-01-31 21:19:05,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:05,017 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 91 transitions. [2022-01-31 21:19:05,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 29 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 21:19:05,018 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 91 transitions. [2022-01-31 21:19:05,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-01-31 21:19:05,019 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:05,019 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:05,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-01-31 21:19:05,019 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:05,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:05,019 INFO L85 PathProgramCache]: Analyzing trace with hash 2971242, now seen corresponding path program 12 times [2022-01-31 21:19:05,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:05,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1249614609] [2022-01-31 21:19:05,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:05,069 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:05,092 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:05,092 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:05,124 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:05,193 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 21:19:05,194 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:05,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:05,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:05,413 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:05,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:05,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:05,800 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:05,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1249614609] [2022-01-31 21:19:05,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1249614609] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:05,800 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:05,801 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-01-31 21:19:05,801 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002132742] [2022-01-31 21:19:05,801 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:05,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-01-31 21:19:05,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:05,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-01-31 21:19:05,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=826, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:19:05,802 INFO L87 Difference]: Start difference. First operand 87 states and 91 transitions. Second operand has 32 states, 32 states have (on average 1.625) internal successors, (52), 31 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 21:19:06,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:06,604 INFO L93 Difference]: Finished difference Result 137 states and 147 transitions. [2022-01-31 21:19:06,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:19:06,605 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.625) internal successors, (52), 31 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 21:19:06,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:06,605 INFO L225 Difference]: With dead ends: 137 [2022-01-31 21:19:06,605 INFO L226 Difference]: Without dead ends: 90 [2022-01-31 21:19:06,607 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1164 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1005, Invalid=3027, Unknown=0, NotChecked=0, Total=4032 [2022-01-31 21:19:06,607 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 87 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 713 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 810 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 713 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:06,608 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 35 Invalid, 810 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 713 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:19:06,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-01-31 21:19:06,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2022-01-31 21:19:06,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.0588235294117647) internal successors, (90), 85 states have internal predecessors, (90), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:06,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2022-01-31 21:19:06,616 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 56 [2022-01-31 21:19:06,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:06,616 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2022-01-31 21:19:06,617 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.625) internal successors, (52), 31 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 21:19:06,617 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2022-01-31 21:19:06,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-01-31 21:19:06,617 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:06,617 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:06,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-01-31 21:19:06,618 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:06,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:06,618 INFO L85 PathProgramCache]: Analyzing trace with hash 994126932, now seen corresponding path program 13 times [2022-01-31 21:19:06,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:06,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650712958] [2022-01-31 21:19:06,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:06,684 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:06,709 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:06,709 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:06,743 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:06,810 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:06,810 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:06,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:06,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:07,014 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:07,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:07,018 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:07,393 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:07,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650712958] [2022-01-31 21:19:07,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1650712958] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:07,394 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:07,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:19:07,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391552440] [2022-01-31 21:19:07,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:07,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:19:07,394 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:07,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:19:07,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=429, Invalid=903, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:19:07,395 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 33 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 21:19:08,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:08,296 INFO L93 Difference]: Finished difference Result 141 states and 151 transitions. [2022-01-31 21:19:08,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:19:08,296 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 33 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 21:19:08,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:08,297 INFO L225 Difference]: With dead ends: 141 [2022-01-31 21:19:08,297 INFO L226 Difference]: Without dead ends: 93 [2022-01-31 21:19:08,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1325 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1178, Invalid=3378, Unknown=0, NotChecked=0, Total=4556 [2022-01-31 21:19:08,299 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 69 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 793 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 871 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 793 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:08,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 55 Invalid, 871 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 793 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:19:08,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-01-31 21:19:08,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-01-31 21:19:08,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0568181818181819) internal successors, (93), 88 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:08,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 97 transitions. [2022-01-31 21:19:08,308 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 97 transitions. Word has length 59 [2022-01-31 21:19:08,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:08,309 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 97 transitions. [2022-01-31 21:19:08,309 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 33 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 21:19:08,309 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 97 transitions. [2022-01-31 21:19:08,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-01-31 21:19:08,309 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:08,309 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:08,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-01-31 21:19:08,310 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:08,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:08,310 INFO L85 PathProgramCache]: Analyzing trace with hash 1360803220, now seen corresponding path program 14 times [2022-01-31 21:19:08,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:08,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [495551274] [2022-01-31 21:19:08,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:08,376 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 21:19:08,412 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:08,412 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:08,442 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:08,485 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 21:19:08,485 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:08,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:08,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:08,697 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:08,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:08,705 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:09,139 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:09,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [495551274] [2022-01-31 21:19:09,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [495551274] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:09,139 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:09,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-01-31 21:19:09,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792702180] [2022-01-31 21:19:09,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:09,140 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-01-31 21:19:09,140 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:09,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-01-31 21:19:09,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1019, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:19:09,141 INFO L87 Difference]: Start difference. First operand 93 states and 97 transitions. Second operand has 36 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 35 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 21:19:10,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:10,010 INFO L93 Difference]: Finished difference Result 145 states and 155 transitions. [2022-01-31 21:19:10,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:19:10,011 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 35 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 21:19:10,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:10,011 INFO L225 Difference]: With dead ends: 145 [2022-01-31 21:19:10,011 INFO L226 Difference]: Without dead ends: 96 [2022-01-31 21:19:10,013 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1496 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1292, Invalid=3820, Unknown=0, NotChecked=0, Total=5112 [2022-01-31 21:19:10,014 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 92 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 827 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 930 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 827 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:10,014 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 25 Invalid, 930 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 827 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:19:10,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-01-31 21:19:10,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2022-01-31 21:19:10,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 91 states have (on average 1.054945054945055) internal successors, (96), 91 states have internal predecessors, (96), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:10,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 100 transitions. [2022-01-31 21:19:10,021 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 100 transitions. Word has length 62 [2022-01-31 21:19:10,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:10,022 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 100 transitions. [2022-01-31 21:19:10,022 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 35 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 21:19:10,022 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 100 transitions. [2022-01-31 21:19:10,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-01-31 21:19:10,022 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:10,022 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:10,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-01-31 21:19:10,023 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:10,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:10,023 INFO L85 PathProgramCache]: Analyzing trace with hash 320401962, now seen corresponding path program 15 times [2022-01-31 21:19:10,023 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:10,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [658182401] [2022-01-31 21:19:10,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:10,077 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 21:19:10,102 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:10,102 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:10,134 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:10,183 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 21:19:10,183 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:10,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:10,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:10,382 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:10,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:10,385 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:10,816 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:10,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [658182401] [2022-01-31 21:19:10,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [658182401] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:10,816 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:10,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:19:10,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263365345] [2022-01-31 21:19:10,817 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:10,817 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:19:10,817 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:10,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:19:10,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=928, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:19:10,818 INFO L87 Difference]: Start difference. First operand 96 states and 100 transitions. Second operand has 38 states, 38 states have (on average 1.605263157894737) internal successors, (61), 37 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 21:19:11,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:11,712 INFO L93 Difference]: Finished difference Result 159 states and 179 transitions. [2022-01-31 21:19:11,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-01-31 21:19:11,713 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.605263157894737) internal successors, (61), 37 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 21:19:11,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:11,714 INFO L225 Difference]: With dead ends: 159 [2022-01-31 21:19:11,714 INFO L226 Difference]: Without dead ends: 109 [2022-01-31 21:19:11,715 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1473 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1428, Invalid=3828, Unknown=0, NotChecked=0, Total=5256 [2022-01-31 21:19:11,716 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 75 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 902 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 998 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 902 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:11,716 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 39 Invalid, 998 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 902 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:19:11,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-01-31 21:19:11,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 71. [2022-01-31 21:19:11,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 66 states have internal predecessors, (70), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:11,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2022-01-31 21:19:11,722 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 65 [2022-01-31 21:19:11,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:11,722 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2022-01-31 21:19:11,722 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.605263157894737) internal successors, (61), 37 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 21:19:11,722 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2022-01-31 21:19:11,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:19:11,723 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:11,723 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:11,723 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-01-31 21:19:11,723 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:11,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:11,724 INFO L85 PathProgramCache]: Analyzing trace with hash 1322848707, now seen corresponding path program 16 times [2022-01-31 21:19:11,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:11,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [428515294] [2022-01-31 21:19:11,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:11,765 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:11,790 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:11,791 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:11,810 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:11,861 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 21:19:11,861 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:11,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:11,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:12,098 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:12,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:12,109 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:12,528 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:12,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [428515294] [2022-01-31 21:19:12,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [428515294] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:12,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:12,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-01-31 21:19:12,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688044611] [2022-01-31 21:19:12,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:12,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-01-31 21:19:12,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:12,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-01-31 21:19:12,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=592, Invalid=1300, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:19:12,530 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand has 41 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 40 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:13,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:13,533 INFO L93 Difference]: Finished difference Result 179 states and 190 transitions. [2022-01-31 21:19:13,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-01-31 21:19:13,534 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 40 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2022-01-31 21:19:13,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:13,534 INFO L225 Difference]: With dead ends: 179 [2022-01-31 21:19:13,534 INFO L226 Difference]: Without dead ends: 116 [2022-01-31 21:19:13,536 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1956 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1668, Invalid=4974, Unknown=0, NotChecked=0, Total=6642 [2022-01-31 21:19:13,537 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 59 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 1035 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 1109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 1035 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:13,537 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 30 Invalid, 1109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 1035 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:19:13,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-01-31 21:19:13,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2022-01-31 21:19:13,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 111 states have (on average 1.045045045045045) internal successors, (116), 111 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 21:19:13,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 120 transitions. [2022-01-31 21:19:13,547 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 120 transitions. Word has length 70 [2022-01-31 21:19:13,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:13,547 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 120 transitions. [2022-01-31 21:19:13,547 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 40 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:13,548 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 120 transitions. [2022-01-31 21:19:13,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:19:13,548 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:13,548 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:13,548 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-01-31 21:19:13,548 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:13,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:13,548 INFO L85 PathProgramCache]: Analyzing trace with hash 750883035, now seen corresponding path program 17 times [2022-01-31 21:19:13,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:13,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2090554654] [2022-01-31 21:19:13,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:13,602 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 21:19:13,621 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 21:19:13,621 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:13,656 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:13,708 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 21:19:13,709 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:13,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:13,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:13,960 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:13,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:13,968 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:14,564 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:14,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2090554654] [2022-01-31 21:19:14,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2090554654] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:14,564 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:14,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-01-31 21:19:14,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573566620] [2022-01-31 21:19:14,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:14,565 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-01-31 21:19:14,565 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:14,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-01-31 21:19:14,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1830, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:19:14,566 INFO L87 Difference]: Start difference. First operand 116 states and 120 transitions. Second operand has 43 states, 43 states have (on average 1.6046511627906976) internal successors, (69), 42 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:15,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:15,606 INFO L93 Difference]: Finished difference Result 182 states and 191 transitions. [2022-01-31 21:19:15,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-01-31 21:19:15,606 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.6046511627906976) internal successors, (69), 42 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2022-01-31 21:19:15,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:15,607 INFO L225 Difference]: With dead ends: 182 [2022-01-31 21:19:15,607 INFO L226 Difference]: Without dead ends: 118 [2022-01-31 21:19:15,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 861 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=364, Invalid=4466, Unknown=0, NotChecked=0, Total=4830 [2022-01-31 21:19:15,608 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 34 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 1429 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 1458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 1429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:15,608 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 140 Invalid, 1458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 1429 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:19:15,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-01-31 21:19:15,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2022-01-31 21:19:15,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0442477876106195) internal successors, (118), 113 states have internal predecessors, (118), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:15,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 122 transitions. [2022-01-31 21:19:15,618 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 122 transitions. Word has length 73 [2022-01-31 21:19:15,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:15,619 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 122 transitions. [2022-01-31 21:19:15,619 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.6046511627906976) internal successors, (69), 42 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:15,619 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 122 transitions. [2022-01-31 21:19:15,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-01-31 21:19:15,619 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:15,619 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:15,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-01-31 21:19:15,619 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:15,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:15,620 INFO L85 PathProgramCache]: Analyzing trace with hash -1657967370, now seen corresponding path program 18 times [2022-01-31 21:19:15,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:15,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1070695171] [2022-01-31 21:19:15,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:15,672 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 21:19:15,690 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:15,690 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:15,728 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 21:19:15,773 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 21:19:15,773 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:15,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:15,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:16,004 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:16,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:16,024 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 21:19:16,736 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:16,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1070695171] [2022-01-31 21:19:16,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1070695171] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:16,737 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:16,737 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-01-31 21:19:16,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803052631] [2022-01-31 21:19:16,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:16,737 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-01-31 21:19:16,737 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:16,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-01-31 21:19:16,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=1919, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:19:16,738 INFO L87 Difference]: Start difference. First operand 118 states and 122 transitions. Second operand has 44 states, 44 states have (on average 1.6136363636363635) internal successors, (71), 43 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:17,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:17,847 INFO L93 Difference]: Finished difference Result 184 states and 193 transitions. [2022-01-31 21:19:17,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-31 21:19:17,847 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.6136363636363635) internal successors, (71), 43 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2022-01-31 21:19:17,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:17,848 INFO L225 Difference]: With dead ends: 184 [2022-01-31 21:19:17,848 INFO L226 Difference]: Without dead ends: 120 [2022-01-31 21:19:17,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 907 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=372, Invalid=4740, Unknown=0, NotChecked=0, Total=5112 [2022-01-31 21:19:17,849 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 35 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 1593 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 1623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1593 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:17,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 150 Invalid, 1623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 1593 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:19:17,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-01-31 21:19:17,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2022-01-31 21:19:17,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 115 states have (on average 1.0434782608695652) internal successors, (120), 115 states have internal predecessors, (120), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:17,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 124 transitions. [2022-01-31 21:19:17,859 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 124 transitions. Word has length 75 [2022-01-31 21:19:17,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:17,859 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 124 transitions. [2022-01-31 21:19:17,859 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.6136363636363635) internal successors, (71), 43 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:17,860 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 124 transitions. [2022-01-31 21:19:17,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-01-31 21:19:17,860 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:17,860 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:17,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-01-31 21:19:17,860 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:17,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:17,861 INFO L85 PathProgramCache]: Analyzing trace with hash -1575834031, now seen corresponding path program 19 times [2022-01-31 21:19:17,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:17,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1283139008] [2022-01-31 21:19:17,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:17,901 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 21:19:17,928 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:17,928 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:17,953 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:18,003 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 21:19:18,003 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:18,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:18,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:18,254 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:18,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:18,257 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:18,933 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:18,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1283139008] [2022-01-31 21:19:18,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1283139008] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:18,933 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:18,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-01-31 21:19:18,933 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626801264] [2022-01-31 21:19:18,933 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:18,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-01-31 21:19:18,934 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:18,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-01-31 21:19:18,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=2010, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:19:18,934 INFO L87 Difference]: Start difference. First operand 120 states and 124 transitions. Second operand has 45 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 44 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 21:19:20,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:20,109 INFO L93 Difference]: Finished difference Result 186 states and 195 transitions. [2022-01-31 21:19:20,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-31 21:19:20,111 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 44 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 21:19:20,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:20,111 INFO L225 Difference]: With dead ends: 186 [2022-01-31 21:19:20,111 INFO L226 Difference]: Without dead ends: 122 [2022-01-31 21:19:20,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=380, Invalid=5022, Unknown=0, NotChecked=0, Total=5402 [2022-01-31 21:19:20,113 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 36 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 1651 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 1682 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 1651 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:20,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 150 Invalid, 1682 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 1651 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:19:20,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-01-31 21:19:20,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2022-01-31 21:19:20,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 117 states have (on average 1.0427350427350428) internal successors, (122), 117 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 21:19:20,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 126 transitions. [2022-01-31 21:19:20,122 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 126 transitions. Word has length 77 [2022-01-31 21:19:20,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:20,122 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 126 transitions. [2022-01-31 21:19:20,122 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 44 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 21:19:20,122 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 126 transitions. [2022-01-31 21:19:20,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:19:20,123 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:20,123 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:20,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-01-31 21:19:20,123 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:20,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:20,124 INFO L85 PathProgramCache]: Analyzing trace with hash 44893420, now seen corresponding path program 20 times [2022-01-31 21:19:20,124 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:20,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [125595926] [2022-01-31 21:19:20,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:20,165 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 21:19:20,184 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:20,184 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:20,211 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:20,262 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 21:19:20,263 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:20,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:20,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:20,509 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:20,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:20,512 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:21,273 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:21,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [125595926] [2022-01-31 21:19:21,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [125595926] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:21,273 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:21,274 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-01-31 21:19:21,274 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083066746] [2022-01-31 21:19:21,274 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:21,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-01-31 21:19:21,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:21,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-01-31 21:19:21,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=2103, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:19:21,275 INFO L87 Difference]: Start difference. First operand 122 states and 126 transitions. Second operand has 46 states, 46 states have (on average 1.6304347826086956) internal successors, (75), 45 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:22,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:22,547 INFO L93 Difference]: Finished difference Result 188 states and 197 transitions. [2022-01-31 21:19:22,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:19:22,547 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.6304347826086956) internal successors, (75), 45 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2022-01-31 21:19:22,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:22,548 INFO L225 Difference]: With dead ends: 188 [2022-01-31 21:19:22,548 INFO L226 Difference]: Without dead ends: 124 [2022-01-31 21:19:22,549 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1002 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=388, Invalid=5312, Unknown=0, NotChecked=0, Total=5700 [2022-01-31 21:19:22,549 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 37 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 1831 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 1863 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 1831 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:22,550 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 160 Invalid, 1863 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 1831 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:19:22,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-01-31 21:19:22,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2022-01-31 21:19:22,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0420168067226891) internal successors, (124), 119 states have internal predecessors, (124), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:22,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 128 transitions. [2022-01-31 21:19:22,560 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 128 transitions. Word has length 79 [2022-01-31 21:19:22,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:22,560 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 128 transitions. [2022-01-31 21:19:22,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.6304347826086956) internal successors, (75), 45 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:22,560 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 128 transitions. [2022-01-31 21:19:22,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-01-31 21:19:22,561 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:22,561 INFO L514 BasicCegarLoop]: trace histogram [27, 26, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:22,561 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-01-31 21:19:22,561 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:22,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:22,561 INFO L85 PathProgramCache]: Analyzing trace with hash -1509154617, now seen corresponding path program 21 times [2022-01-31 21:19:22,562 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:22,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [802998902] [2022-01-31 21:19:22,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:22,601 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:22,625 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:22,625 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:22,651 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:22,695 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 21:19:22,695 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:22,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:22,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:22,969 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:22,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:22,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:23,630 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:23,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [802998902] [2022-01-31 21:19:23,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [802998902] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:23,630 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:23,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-01-31 21:19:23,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962923273] [2022-01-31 21:19:23,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:23,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-01-31 21:19:23,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:23,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-01-31 21:19:23,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=729, Invalid=1721, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:19:23,632 INFO L87 Difference]: Start difference. First operand 124 states and 128 transitions. Second operand has 47 states, 47 states have (on average 1.6382978723404256) internal successors, (77), 46 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:24,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:24,994 INFO L93 Difference]: Finished difference Result 191 states and 201 transitions. [2022-01-31 21:19:24,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-01-31 21:19:24,995 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.6382978723404256) internal successors, (77), 46 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2022-01-31 21:19:24,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:24,995 INFO L225 Difference]: With dead ends: 191 [2022-01-31 21:19:24,995 INFO L226 Difference]: Without dead ends: 127 [2022-01-31 21:19:24,996 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2544 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2070, Invalid=6672, Unknown=0, NotChecked=0, Total=8742 [2022-01-31 21:19:24,997 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 71 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 1547 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 1635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 1547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:24,997 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 40 Invalid, 1635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 1547 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:19:24,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-01-31 21:19:25,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2022-01-31 21:19:25,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.040983606557377) internal successors, (127), 122 states have internal predecessors, (127), 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 21:19:25,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 131 transitions. [2022-01-31 21:19:25,006 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 131 transitions. Word has length 81 [2022-01-31 21:19:25,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:25,006 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 131 transitions. [2022-01-31 21:19:25,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.6382978723404256) internal successors, (77), 46 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:25,006 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 131 transitions. [2022-01-31 21:19:25,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-01-31 21:19:25,006 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:25,006 INFO L514 BasicCegarLoop]: trace histogram [28, 27, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:25,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-01-31 21:19:25,007 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:25,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:25,007 INFO L85 PathProgramCache]: Analyzing trace with hash -696201791, now seen corresponding path program 22 times [2022-01-31 21:19:25,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:25,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [620243452] [2022-01-31 21:19:25,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:25,058 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 21:19:25,077 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:25,077 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:25,101 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:25,155 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 21:19:25,155 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:25,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:25,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:25,430 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:25,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:25,433 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:26,010 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:26,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [620243452] [2022-01-31 21:19:26,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [620243452] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:26,010 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:26,010 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-01-31 21:19:26,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661245637] [2022-01-31 21:19:26,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:26,011 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-01-31 21:19:26,011 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:26,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-01-31 21:19:26,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=828, Invalid=1824, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:19:26,012 INFO L87 Difference]: Start difference. First operand 127 states and 131 transitions. Second operand has 49 states, 49 states have (on average 1.6326530612244898) internal successors, (80), 48 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:27,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:27,531 INFO L93 Difference]: Finished difference Result 195 states and 205 transitions. [2022-01-31 21:19:27,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-01-31 21:19:27,531 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.6326530612244898) internal successors, (80), 48 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 84 [2022-01-31 21:19:27,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:27,532 INFO L225 Difference]: With dead ends: 195 [2022-01-31 21:19:27,532 INFO L226 Difference]: Without dead ends: 130 [2022-01-31 21:19:27,533 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2786 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2331, Invalid=7175, Unknown=0, NotChecked=0, Total=9506 [2022-01-31 21:19:27,533 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 161 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 1778 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 1953 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 1778 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:27,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 39 Invalid, 1953 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 1778 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:19:27,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-01-31 21:19:27,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2022-01-31 21:19:27,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.04) internal successors, (130), 125 states have internal predecessors, (130), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:27,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 134 transitions. [2022-01-31 21:19:27,544 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 134 transitions. Word has length 84 [2022-01-31 21:19:27,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:27,544 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 134 transitions. [2022-01-31 21:19:27,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.6326530612244898) internal successors, (80), 48 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:27,544 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 134 transitions. [2022-01-31 21:19:27,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-01-31 21:19:27,545 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:27,545 INFO L514 BasicCegarLoop]: trace histogram [29, 28, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:27,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-01-31 21:19:27,545 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:27,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:27,546 INFO L85 PathProgramCache]: Analyzing trace with hash -452282019, now seen corresponding path program 23 times [2022-01-31 21:19:27,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:27,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1833503309] [2022-01-31 21:19:27,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:27,591 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 21:19:27,614 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 21:19:27,614 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:27,642 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:27,686 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 21:19:27,686 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:27,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:27,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:28,005 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:28,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:28,008 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:28,824 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:28,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1833503309] [2022-01-31 21:19:28,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1833503309] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:28,825 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:28,825 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-01-31 21:19:28,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679498263] [2022-01-31 21:19:28,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:28,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-01-31 21:19:28,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:28,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-01-31 21:19:28,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=295, Invalid=2567, Unknown=0, NotChecked=0, Total=2862 [2022-01-31 21:19:28,827 INFO L87 Difference]: Start difference. First operand 130 states and 134 transitions. Second operand has 51 states, 51 states have (on average 1.6274509803921569) internal successors, (83), 50 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:30,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:30,445 INFO L93 Difference]: Finished difference Result 198 states and 207 transitions. [2022-01-31 21:19:30,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-01-31 21:19:30,445 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.6274509803921569) internal successors, (83), 50 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 87 [2022-01-31 21:19:30,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:30,445 INFO L225 Difference]: With dead ends: 198 [2022-01-31 21:19:30,445 INFO L226 Difference]: Without dead ends: 132 [2022-01-31 21:19:30,446 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1220 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=449, Invalid=6523, Unknown=0, NotChecked=0, Total=6972 [2022-01-31 21:19:30,447 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 40 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 2277 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 2312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 2277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:30,447 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 180 Invalid, 2312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 2277 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:19:30,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-01-31 21:19:30,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2022-01-31 21:19:30,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 127 states have (on average 1.0393700787401574) internal successors, (132), 127 states have internal predecessors, (132), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:30,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 136 transitions. [2022-01-31 21:19:30,459 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 136 transitions. Word has length 87 [2022-01-31 21:19:30,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:30,459 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 136 transitions. [2022-01-31 21:19:30,459 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.6274509803921569) internal successors, (83), 50 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:30,459 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 136 transitions. [2022-01-31 21:19:30,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-01-31 21:19:30,459 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:30,460 INFO L514 BasicCegarLoop]: trace histogram [30, 29, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:30,460 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2022-01-31 21:19:30,460 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:30,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:30,460 INFO L85 PathProgramCache]: Analyzing trace with hash -945173960, now seen corresponding path program 24 times [2022-01-31 21:19:30,460 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:30,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [410135357] [2022-01-31 21:19:30,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:30,504 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 21:19:30,529 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:30,530 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:30,554 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:30,591 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 21:19:30,591 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:30,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:30,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:30,831 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:30,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:30,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:31,572 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:31,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [410135357] [2022-01-31 21:19:31,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [410135357] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:31,572 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:31,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-01-31 21:19:31,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263437210] [2022-01-31 21:19:31,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:31,573 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-01-31 21:19:31,573 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:31,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-01-31 21:19:31,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=842, Invalid=1810, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:19:31,574 INFO L87 Difference]: Start difference. First operand 132 states and 136 transitions. Second operand has 52 states, 52 states have (on average 1.6346153846153846) internal successors, (85), 51 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 21:19:33,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:33,256 INFO L93 Difference]: Finished difference Result 219 states and 247 transitions. [2022-01-31 21:19:33,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-01-31 21:19:33,256 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.6346153846153846) internal successors, (85), 51 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 21:19:33,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:33,257 INFO L225 Difference]: With dead ends: 219 [2022-01-31 21:19:33,257 INFO L226 Difference]: Without dead ends: 153 [2022-01-31 21:19:33,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2855 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2520, Invalid=7580, Unknown=0, NotChecked=0, Total=10100 [2022-01-31 21:19:33,258 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 170 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 1940 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 2108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 1940 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:33,258 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 29 Invalid, 2108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 1940 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:19:33,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2022-01-31 21:19:33,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 95. [2022-01-31 21:19:33,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0444444444444445) internal successors, (94), 90 states have internal predecessors, (94), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:33,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2022-01-31 21:19:33,267 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 89 [2022-01-31 21:19:33,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:33,268 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2022-01-31 21:19:33,268 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.6346153846153846) internal successors, (85), 51 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 21:19:33,268 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2022-01-31 21:19:33,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-01-31 21:19:33,268 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:33,268 INFO L514 BasicCegarLoop]: trace histogram [32, 31, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:33,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2022-01-31 21:19:33,269 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:33,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:33,269 INFO L85 PathProgramCache]: Analyzing trace with hash 140017013, now seen corresponding path program 25 times [2022-01-31 21:19:33,269 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:33,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [709512397] [2022-01-31 21:19:33,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:33,312 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 21:19:33,330 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:33,330 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:33,355 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:33,407 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 21:19:33,407 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:33,407 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:33,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:33,736 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:33,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:33,739 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:34,528 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:34,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [709512397] [2022-01-31 21:19:34,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [709512397] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:34,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:34,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2022-01-31 21:19:34,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252746865] [2022-01-31 21:19:34,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:34,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-01-31 21:19:34,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:34,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-01-31 21:19:34,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=986, Invalid=2320, Unknown=0, NotChecked=0, Total=3306 [2022-01-31 21:19:34,530 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand has 55 states, 55 states have (on average 1.6363636363636365) internal successors, (90), 54 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:36,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:36,479 INFO L93 Difference]: Finished difference Result 247 states and 258 transitions. [2022-01-31 21:19:36,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-01-31 21:19:36,487 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.6363636363636365) internal successors, (90), 54 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 94 [2022-01-31 21:19:36,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:36,488 INFO L225 Difference]: With dead ends: 247 [2022-01-31 21:19:36,488 INFO L226 Difference]: Without dead ends: 160 [2022-01-31 21:19:36,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3509 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2824, Invalid=9166, Unknown=0, NotChecked=0, Total=11990 [2022-01-31 21:19:36,490 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 114 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 2299 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 2432 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 2299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:36,490 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 80 Invalid, 2432 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 2299 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:19:36,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-01-31 21:19:36,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2022-01-31 21:19:36,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 155 states have (on average 1.032258064516129) internal successors, (160), 155 states have internal predecessors, (160), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:36,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 164 transitions. [2022-01-31 21:19:36,506 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 164 transitions. Word has length 94 [2022-01-31 21:19:36,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:36,506 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 164 transitions. [2022-01-31 21:19:36,506 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.6363636363636365) internal successors, (90), 54 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:36,507 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 164 transitions. [2022-01-31 21:19:36,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-01-31 21:19:36,507 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:36,507 INFO L514 BasicCegarLoop]: trace histogram [33, 32, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:36,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-01-31 21:19:36,507 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:36,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:36,508 INFO L85 PathProgramCache]: Analyzing trace with hash -168854935, now seen corresponding path program 26 times [2022-01-31 21:19:36,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:36,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368508221] [2022-01-31 21:19:36,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:36,572 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 21:19:36,603 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:36,603 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:36,627 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:36,679 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 21:19:36,680 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:36,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:36,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:37,010 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:37,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:37,013 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:37,806 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:37,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368508221] [2022-01-31 21:19:37,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1368508221] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:37,806 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:37,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2022-01-31 21:19:37,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385983880] [2022-01-31 21:19:37,806 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:37,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-01-31 21:19:37,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:37,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-01-31 21:19:37,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1065, Invalid=2475, Unknown=0, NotChecked=0, Total=3540 [2022-01-31 21:19:37,811 INFO L87 Difference]: Start difference. First operand 160 states and 164 transitions. Second operand has 57 states, 57 states have (on average 1.631578947368421) internal successors, (93), 56 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:39,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:39,830 INFO L93 Difference]: Finished difference Result 251 states and 261 transitions. [2022-01-31 21:19:39,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-01-31 21:19:39,831 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.631578947368421) internal successors, (93), 56 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2022-01-31 21:19:39,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:39,832 INFO L225 Difference]: With dead ends: 251 [2022-01-31 21:19:39,832 INFO L226 Difference]: Without dead ends: 163 [2022-01-31 21:19:39,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3785 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3056, Invalid=9826, Unknown=0, NotChecked=0, Total=12882 [2022-01-31 21:19:39,834 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 260 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 2350 mSolverCounterSat, 276 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 2626 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 276 IncrementalHoareTripleChecker+Valid, 2350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:39,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [260 Valid, 35 Invalid, 2626 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [276 Valid, 2350 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:19:39,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-01-31 21:19:39,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2022-01-31 21:19:39,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.0316455696202531) internal successors, (163), 158 states have internal predecessors, (163), 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 21:19:39,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 167 transitions. [2022-01-31 21:19:39,850 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 167 transitions. Word has length 97 [2022-01-31 21:19:39,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:39,850 INFO L470 AbstractCegarLoop]: Abstraction has 163 states and 167 transitions. [2022-01-31 21:19:39,850 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.631578947368421) internal successors, (93), 56 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:39,850 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 167 transitions. [2022-01-31 21:19:39,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-01-31 21:19:39,851 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:39,851 INFO L514 BasicCegarLoop]: trace histogram [34, 33, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:39,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2022-01-31 21:19:39,851 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:39,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:39,852 INFO L85 PathProgramCache]: Analyzing trace with hash 225279583, now seen corresponding path program 27 times [2022-01-31 21:19:39,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:39,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1801368521] [2022-01-31 21:19:39,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:39,898 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 21:19:39,922 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:39,922 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:39,940 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 21:19:39,982 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:39,982 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:39,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:39,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:40,317 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:40,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:40,328 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:41,123 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:41,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1801368521] [2022-01-31 21:19:41,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1801368521] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:41,123 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:41,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2022-01-31 21:19:41,123 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574626808] [2022-01-31 21:19:41,123 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:41,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-01-31 21:19:41,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:41,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-01-31 21:19:41,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1147, Invalid=2635, Unknown=0, NotChecked=0, Total=3782 [2022-01-31 21:19:41,124 INFO L87 Difference]: Start difference. First operand 163 states and 167 transitions. Second operand has 59 states, 59 states have (on average 1.6271186440677967) internal successors, (96), 58 states have internal predecessors, (96), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:43,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:43,245 INFO L93 Difference]: Finished difference Result 255 states and 265 transitions. [2022-01-31 21:19:43,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-01-31 21:19:43,247 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.6271186440677967) internal successors, (96), 58 states have internal predecessors, (96), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 100 [2022-01-31 21:19:43,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:43,248 INFO L225 Difference]: With dead ends: 255 [2022-01-31 21:19:43,248 INFO L226 Difference]: Without dead ends: 166 [2022-01-31 21:19:43,249 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4071 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3297, Invalid=10509, Unknown=0, NotChecked=0, Total=13806 [2022-01-31 21:19:43,250 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 195 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 2534 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 2749 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 2534 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:43,250 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 25 Invalid, 2749 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 2534 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:19:43,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-01-31 21:19:43,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2022-01-31 21:19:43,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 161 states have (on average 1.031055900621118) internal successors, (166), 161 states have internal predecessors, (166), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:43,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 170 transitions. [2022-01-31 21:19:43,266 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 170 transitions. Word has length 100 [2022-01-31 21:19:43,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:43,266 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 170 transitions. [2022-01-31 21:19:43,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.6271186440677967) internal successors, (96), 58 states have internal predecessors, (96), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:43,266 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 170 transitions. [2022-01-31 21:19:43,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-01-31 21:19:43,267 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:43,267 INFO L514 BasicCegarLoop]: trace histogram [35, 34, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:43,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-01-31 21:19:43,267 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:43,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:43,267 INFO L85 PathProgramCache]: Analyzing trace with hash -1743288705, now seen corresponding path program 28 times [2022-01-31 21:19:43,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:43,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836836371] [2022-01-31 21:19:43,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:43,333 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 21:19:43,364 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:43,365 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:43,386 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:43,432 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 21:19:43,432 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:43,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:43,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:43,861 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:43,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:43,865 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:44,756 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:44,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836836371] [2022-01-31 21:19:44,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [836836371] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:44,756 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:44,756 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2022-01-31 21:19:44,756 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146458105] [2022-01-31 21:19:44,756 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:44,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-01-31 21:19:44,756 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:44,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-01-31 21:19:44,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1232, Invalid=2800, Unknown=0, NotChecked=0, Total=4032 [2022-01-31 21:19:44,759 INFO L87 Difference]: Start difference. First operand 166 states and 170 transitions. Second operand has 61 states, 61 states have (on average 1.6229508196721312) internal successors, (99), 60 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:47,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:47,051 INFO L93 Difference]: Finished difference Result 259 states and 269 transitions. [2022-01-31 21:19:47,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-01-31 21:19:47,052 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.6229508196721312) internal successors, (99), 60 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2022-01-31 21:19:47,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:47,055 INFO L225 Difference]: With dead ends: 259 [2022-01-31 21:19:47,055 INFO L226 Difference]: Without dead ends: 169 [2022-01-31 21:19:47,057 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4367 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3547, Invalid=11215, Unknown=0, NotChecked=0, Total=14762 [2022-01-31 21:19:47,057 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 271 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 2820 mSolverCounterSat, 290 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 3110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 290 IncrementalHoareTripleChecker+Valid, 2820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:47,058 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [271 Valid, 85 Invalid, 3110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [290 Valid, 2820 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:19:47,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2022-01-31 21:19:47,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2022-01-31 21:19:47,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0304878048780488) internal successors, (169), 164 states have internal predecessors, (169), 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 21:19:47,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 173 transitions. [2022-01-31 21:19:47,075 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 173 transitions. Word has length 103 [2022-01-31 21:19:47,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:47,075 INFO L470 AbstractCegarLoop]: Abstraction has 169 states and 173 transitions. [2022-01-31 21:19:47,075 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.6229508196721312) internal successors, (99), 60 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:47,075 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 173 transitions. [2022-01-31 21:19:47,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-01-31 21:19:47,076 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:47,076 INFO L514 BasicCegarLoop]: trace histogram [36, 35, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:47,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-01-31 21:19:47,077 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:47,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:47,077 INFO L85 PathProgramCache]: Analyzing trace with hash -2094600887, now seen corresponding path program 29 times [2022-01-31 21:19:47,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:47,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950633061] [2022-01-31 21:19:47,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:47,136 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 21:19:47,159 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:47,159 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:47,191 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:47,238 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 21:19:47,238 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:47,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:47,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:47,696 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:47,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:47,712 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:48,541 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:48,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950633061] [2022-01-31 21:19:48,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [950633061] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:48,541 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:48,542 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2022-01-31 21:19:48,542 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741641855] [2022-01-31 21:19:48,542 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:48,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-01-31 21:19:48,542 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:48,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-01-31 21:19:48,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1359, Invalid=2931, Unknown=0, NotChecked=0, Total=4290 [2022-01-31 21:19:48,543 INFO L87 Difference]: Start difference. First operand 169 states and 173 transitions. Second operand has 63 states, 63 states have (on average 1.619047619047619) internal successors, (102), 62 states have internal predecessors, (102), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:50,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:50,928 INFO L93 Difference]: Finished difference Result 263 states and 273 transitions. [2022-01-31 21:19:50,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-01-31 21:19:50,929 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.619047619047619) internal successors, (102), 62 states have internal predecessors, (102), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 106 [2022-01-31 21:19:50,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:50,929 INFO L225 Difference]: With dead ends: 263 [2022-01-31 21:19:50,929 INFO L226 Difference]: Without dead ends: 172 [2022-01-31 21:19:50,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4679 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3884, Invalid=11866, Unknown=0, NotChecked=0, Total=15750 [2022-01-31 21:19:50,931 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 160 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 2884 mSolverCounterSat, 181 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 3065 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 181 IncrementalHoareTripleChecker+Valid, 2884 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:50,931 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 79 Invalid, 3065 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [181 Valid, 2884 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:19:50,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2022-01-31 21:19:50,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2022-01-31 21:19:50,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.029940119760479) internal successors, (172), 167 states have internal predecessors, (172), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:50,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 176 transitions. [2022-01-31 21:19:50,956 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 176 transitions. Word has length 106 [2022-01-31 21:19:50,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:50,956 INFO L470 AbstractCegarLoop]: Abstraction has 172 states and 176 transitions. [2022-01-31 21:19:50,956 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.619047619047619) internal successors, (102), 62 states have internal predecessors, (102), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:50,956 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 176 transitions. [2022-01-31 21:19:50,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-01-31 21:19:50,957 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:50,957 INFO L514 BasicCegarLoop]: trace histogram [37, 36, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:50,957 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2022-01-31 21:19:50,957 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:50,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:50,957 INFO L85 PathProgramCache]: Analyzing trace with hash -1759112043, now seen corresponding path program 30 times [2022-01-31 21:19:50,958 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:50,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [969599220] [2022-01-31 21:19:50,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:51,000 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 21:19:51,036 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:51,036 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:51,056 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:51,110 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 21:19:51,110 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:51,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:51,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:51,509 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:51,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:51,519 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:52,724 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:52,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [969599220] [2022-01-31 21:19:52,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [969599220] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:52,725 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:52,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2022-01-31 21:19:52,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120326654] [2022-01-31 21:19:52,725 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:52,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-01-31 21:19:52,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:52,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-01-31 21:19:52,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=454, Invalid=4102, Unknown=0, NotChecked=0, Total=4556 [2022-01-31 21:19:52,726 INFO L87 Difference]: Start difference. First operand 172 states and 176 transitions. Second operand has 65 states, 65 states have (on average 1.6153846153846154) internal successors, (105), 64 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:55,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:55,003 INFO L93 Difference]: Finished difference Result 266 states and 275 transitions. [2022-01-31 21:19:55,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-01-31 21:19:55,004 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.6153846153846154) internal successors, (105), 64 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2022-01-31 21:19:55,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:55,005 INFO L225 Difference]: With dead ends: 266 [2022-01-31 21:19:55,005 INFO L226 Difference]: Without dead ends: 174 [2022-01-31 21:19:55,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1932 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=648, Invalid=10482, Unknown=0, NotChecked=0, Total=11130 [2022-01-31 21:19:55,006 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 48 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 3489 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 3532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 3489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:55,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 220 Invalid, 3532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 3489 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:19:55,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2022-01-31 21:19:55,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 174. [2022-01-31 21:19:55,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 169 states have (on average 1.029585798816568) internal successors, (174), 169 states have internal predecessors, (174), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:55,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 178 transitions. [2022-01-31 21:19:55,022 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 178 transitions. Word has length 109 [2022-01-31 21:19:55,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:55,022 INFO L470 AbstractCegarLoop]: Abstraction has 174 states and 178 transitions. [2022-01-31 21:19:55,022 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.6153846153846154) internal successors, (105), 64 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:55,022 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 178 transitions. [2022-01-31 21:19:55,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-01-31 21:19:55,023 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:55,023 INFO L514 BasicCegarLoop]: trace histogram [38, 37, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:55,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2022-01-31 21:19:55,023 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:55,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:55,024 INFO L85 PathProgramCache]: Analyzing trace with hash -1165541584, now seen corresponding path program 31 times [2022-01-31 21:19:55,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:55,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1893847260] [2022-01-31 21:19:55,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:55,079 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 21:19:55,104 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:55,104 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:55,138 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:55,202 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 21:19:55,203 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:55,203 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:55,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:55,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:55,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:55,618 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:56,546 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:56,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1893847260] [2022-01-31 21:19:56,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1893847260] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:56,546 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:56,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2022-01-31 21:19:56,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842207387] [2022-01-31 21:19:56,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:56,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-01-31 21:19:56,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:56,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-01-31 21:19:56,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1438, Invalid=3254, Unknown=0, NotChecked=0, Total=4692 [2022-01-31 21:19:56,548 INFO L87 Difference]: Start difference. First operand 174 states and 178 transitions. Second operand has 66 states, 66 states have (on average 1.621212121212121) internal successors, (107), 65 states have internal predecessors, (107), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:59,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:59,127 INFO L93 Difference]: Finished difference Result 269 states and 279 transitions. [2022-01-31 21:19:59,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-01-31 21:19:59,131 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.621212121212121) internal successors, (107), 65 states have internal predecessors, (107), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 111 [2022-01-31 21:19:59,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:59,132 INFO L225 Difference]: With dead ends: 269 [2022-01-31 21:19:59,132 INFO L226 Difference]: Without dead ends: 177 [2022-01-31 21:19:59,134 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5129 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=4154, Invalid=13138, Unknown=0, NotChecked=0, Total=17292 [2022-01-31 21:19:59,134 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 128 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 3201 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 3350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 3201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:59,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 35 Invalid, 3350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 3201 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:19:59,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2022-01-31 21:19:59,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2022-01-31 21:19:59,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 172 states have (on average 1.0290697674418605) internal successors, (177), 172 states have internal predecessors, (177), 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 21:19:59,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 181 transitions. [2022-01-31 21:19:59,150 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 181 transitions. Word has length 111 [2022-01-31 21:19:59,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:59,151 INFO L470 AbstractCegarLoop]: Abstraction has 177 states and 181 transitions. [2022-01-31 21:19:59,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 1.621212121212121) internal successors, (107), 65 states have internal predecessors, (107), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:59,151 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 181 transitions. [2022-01-31 21:19:59,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-01-31 21:19:59,151 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:59,152 INFO L514 BasicCegarLoop]: trace histogram [39, 38, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:59,152 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2022-01-31 21:19:59,152 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:59,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:59,152 INFO L85 PathProgramCache]: Analyzing trace with hash -1059326536, now seen corresponding path program 32 times [2022-01-31 21:19:59,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:59,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [359421592] [2022-01-31 21:19:59,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:59,201 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 21:19:59,233 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:59,233 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:59,262 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:59,325 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 21:19:59,325 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:59,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:59,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:59,783 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:59,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:59,791 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:00,753 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:00,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [359421592] [2022-01-31 21:20:00,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [359421592] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:00,753 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:00,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2022-01-31 21:20:00,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400239997] [2022-01-31 21:20:00,753 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:00,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-01-31 21:20:00,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:00,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-01-31 21:20:00,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1533, Invalid=3437, Unknown=0, NotChecked=0, Total=4970 [2022-01-31 21:20:00,755 INFO L87 Difference]: Start difference. First operand 177 states and 181 transitions. Second operand has 68 states, 68 states have (on average 1.6176470588235294) internal successors, (110), 67 states have internal predecessors, (110), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:03,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:03,516 INFO L93 Difference]: Finished difference Result 273 states and 283 transitions. [2022-01-31 21:20:03,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-01-31 21:20:03,516 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.6176470588235294) internal successors, (110), 67 states have internal predecessors, (110), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 114 [2022-01-31 21:20:03,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:03,517 INFO L225 Difference]: With dead ends: 273 [2022-01-31 21:20:03,517 INFO L226 Difference]: Without dead ends: 180 [2022-01-31 21:20:03,519 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5460 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=4434, Invalid=13926, Unknown=0, NotChecked=0, Total=18360 [2022-01-31 21:20:03,519 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 258 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 3398 mSolverCounterSat, 279 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 258 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 3677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 279 IncrementalHoareTripleChecker+Valid, 3398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:03,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [258 Valid, 50 Invalid, 3677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [279 Valid, 3398 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:20:03,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-01-31 21:20:03,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 180. [2022-01-31 21:20:03,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 175 states have (on average 1.0285714285714285) internal successors, (180), 175 states have internal predecessors, (180), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:03,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 184 transitions. [2022-01-31 21:20:03,536 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 184 transitions. Word has length 114 [2022-01-31 21:20:03,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:03,537 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 184 transitions. [2022-01-31 21:20:03,537 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.6176470588235294) internal successors, (110), 67 states have internal predecessors, (110), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:03,537 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 184 transitions. [2022-01-31 21:20:03,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-01-31 21:20:03,538 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:03,538 INFO L514 BasicCegarLoop]: trace histogram [40, 39, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:03,538 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2022-01-31 21:20:03,538 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:03,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:03,538 INFO L85 PathProgramCache]: Analyzing trace with hash -2139058426, now seen corresponding path program 33 times [2022-01-31 21:20:03,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:03,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730852871] [2022-01-31 21:20:03,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:03,597 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 21:20:03,621 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 21:20:03,621 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:03,645 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:03,699 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 21:20:03,699 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:03,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:03,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:04,162 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:04,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:04,176 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:05,196 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:05,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730852871] [2022-01-31 21:20:05,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1730852871] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:05,196 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:05,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2022-01-31 21:20:05,196 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562709385] [2022-01-31 21:20:05,196 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:05,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-01-31 21:20:05,199 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:05,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-01-31 21:20:05,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1631, Invalid=3625, Unknown=0, NotChecked=0, Total=5256 [2022-01-31 21:20:05,201 INFO L87 Difference]: Start difference. First operand 180 states and 184 transitions. Second operand has 70 states, 70 states have (on average 1.6142857142857143) internal successors, (113), 69 states have internal predecessors, (113), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:08,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:08,056 INFO L93 Difference]: Finished difference Result 277 states and 287 transitions. [2022-01-31 21:20:08,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-01-31 21:20:08,056 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.6142857142857143) internal successors, (113), 69 states have internal predecessors, (113), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 117 [2022-01-31 21:20:08,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:08,057 INFO L225 Difference]: With dead ends: 277 [2022-01-31 21:20:08,057 INFO L226 Difference]: Without dead ends: 183 [2022-01-31 21:20:08,058 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5801 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=4723, Invalid=14737, Unknown=0, NotChecked=0, Total=19460 [2022-01-31 21:20:08,058 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 178 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 3408 mSolverCounterSat, 200 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 3608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 200 IncrementalHoareTripleChecker+Valid, 3408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:08,058 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 30 Invalid, 3608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [200 Valid, 3408 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:20:08,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2022-01-31 21:20:08,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 183. [2022-01-31 21:20:08,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 178 states have (on average 1.0280898876404494) internal successors, (183), 178 states have internal predecessors, (183), 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 21:20:08,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 187 transitions. [2022-01-31 21:20:08,075 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 187 transitions. Word has length 117 [2022-01-31 21:20:08,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:08,075 INFO L470 AbstractCegarLoop]: Abstraction has 183 states and 187 transitions. [2022-01-31 21:20:08,075 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 1.6142857142857143) internal successors, (113), 69 states have internal predecessors, (113), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:08,075 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 187 transitions. [2022-01-31 21:20:08,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2022-01-31 21:20:08,076 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:08,076 INFO L514 BasicCegarLoop]: trace histogram [41, 40, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:08,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2022-01-31 21:20:08,076 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:08,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:08,076 INFO L85 PathProgramCache]: Analyzing trace with hash -1602934558, now seen corresponding path program 34 times [2022-01-31 21:20:08,076 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:08,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1657088518] [2022-01-31 21:20:08,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:08,116 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 21:20:08,141 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:08,141 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:08,158 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:08,197 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 21:20:08,197 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:08,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:08,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:08,603 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:08,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:08,606 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:09,619 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:09,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1657088518] [2022-01-31 21:20:09,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1657088518] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:09,619 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:09,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2022-01-31 21:20:09,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619824034] [2022-01-31 21:20:09,620 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:09,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2022-01-31 21:20:09,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:09,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2022-01-31 21:20:09,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1667, Invalid=3445, Unknown=0, NotChecked=0, Total=5112 [2022-01-31 21:20:09,621 INFO L87 Difference]: Start difference. First operand 183 states and 187 transitions. Second operand has 72 states, 72 states have (on average 1.6111111111111112) internal successors, (116), 71 states have internal predecessors, (116), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:12,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:12,579 INFO L93 Difference]: Finished difference Result 301 states and 331 transitions. [2022-01-31 21:20:12,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-01-31 21:20:12,580 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.6111111111111112) internal successors, (116), 71 states have internal predecessors, (116), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 120 [2022-01-31 21:20:12,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:12,581 INFO L225 Difference]: With dead ends: 301 [2022-01-31 21:20:12,581 INFO L226 Difference]: Without dead ends: 206 [2022-01-31 21:20:12,583 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5767 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=4995, Invalid=14745, Unknown=0, NotChecked=0, Total=19740 [2022-01-31 21:20:12,583 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 138 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 3559 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 3735 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 3559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:12,583 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 49 Invalid, 3735 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 3559 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-01-31 21:20:12,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-01-31 21:20:12,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 126. [2022-01-31 21:20:12,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 121 states have (on average 1.0330578512396693) internal successors, (125), 121 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 21:20:12,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 129 transitions. [2022-01-31 21:20:12,592 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 129 transitions. Word has length 120 [2022-01-31 21:20:12,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:12,592 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 129 transitions. [2022-01-31 21:20:12,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 1.6111111111111112) internal successors, (116), 71 states have internal predecessors, (116), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:12,593 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 129 transitions. [2022-01-31 21:20:12,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-01-31 21:20:12,593 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:12,593 INFO L514 BasicCegarLoop]: trace histogram [43, 42, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:12,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2022-01-31 21:20:12,593 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:12,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:12,594 INFO L85 PathProgramCache]: Analyzing trace with hash -8499145, now seen corresponding path program 35 times [2022-01-31 21:20:12,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:12,594 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1759692860] [2022-01-31 21:20:12,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:12,639 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 21:20:12,664 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:12,664 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:12,690 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:12,741 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 21:20:12,741 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:12,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:12,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:13,198 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:13,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:13,216 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:14,304 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:14,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1759692860] [2022-01-31 21:20:14,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1759692860] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:14,304 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:14,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2022-01-31 21:20:14,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517685765] [2022-01-31 21:20:14,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:14,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-01-31 21:20:14,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:14,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-01-31 21:20:14,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1874, Invalid=3826, Unknown=0, NotChecked=0, Total=5700 [2022-01-31 21:20:14,306 INFO L87 Difference]: Start difference. First operand 126 states and 129 transitions. Second operand has 76 states, 76 states have (on average 1.5921052631578947) internal successors, (121), 75 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 21:20:17,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:17,508 INFO L93 Difference]: Finished difference Result 250 states and 262 transitions. [2022-01-31 21:20:17,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-01-31 21:20:17,508 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.5921052631578947) internal successors, (121), 75 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 21:20:17,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:17,509 INFO L225 Difference]: With dead ends: 250 [2022-01-31 21:20:17,509 INFO L226 Difference]: Without dead ends: 132 [2022-01-31 21:20:17,511 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6451 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=5616, Invalid=16436, Unknown=0, NotChecked=0, Total=22052 [2022-01-31 21:20:17,511 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 191 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 3859 mSolverCounterSat, 178 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 4037 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 3859 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:17,511 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 49 Invalid, 4037 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [178 Valid, 3859 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-01-31 21:20:17,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-01-31 21:20:17,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2022-01-31 21:20:17,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 127 states have (on average 1.031496062992126) internal successors, (131), 127 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 21:20:17,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 135 transitions. [2022-01-31 21:20:17,524 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 135 transitions. Word has length 125 [2022-01-31 21:20:17,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:17,524 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 135 transitions. [2022-01-31 21:20:17,524 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 1.5921052631578947) internal successors, (121), 75 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 21:20:17,524 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 135 transitions. [2022-01-31 21:20:17,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-01-31 21:20:17,525 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:17,525 INFO L514 BasicCegarLoop]: trace histogram [45, 44, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:17,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2022-01-31 21:20:17,525 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:17,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:17,526 INFO L85 PathProgramCache]: Analyzing trace with hash -1509149747, now seen corresponding path program 36 times [2022-01-31 21:20:17,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:17,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257681085] [2022-01-31 21:20:17,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:17,571 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 21:20:17,592 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 21:20:17,592 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:17,622 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:17,679 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 21:20:17,679 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:17,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:17,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:18,225 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:18,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:18,228 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:19,426 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:19,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257681085] [2022-01-31 21:20:19,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1257681085] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:19,427 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:19,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2022-01-31 21:20:19,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532189531] [2022-01-31 21:20:19,427 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:19,427 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-01-31 21:20:19,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:19,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-01-31 21:20:19,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2086, Invalid=4556, Unknown=0, NotChecked=0, Total=6642 [2022-01-31 21:20:19,428 INFO L87 Difference]: Start difference. First operand 132 states and 135 transitions. Second operand has 79 states, 79 states have (on average 1.6075949367088607) internal successors, (127), 78 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 21:20:22,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:22,970 INFO L93 Difference]: Finished difference Result 347 states and 358 transitions. [2022-01-31 21:20:22,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2022-01-31 21:20:22,971 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.6075949367088607) internal successors, (127), 78 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 21:20:22,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:22,972 INFO L225 Difference]: With dead ends: 347 [2022-01-31 21:20:22,972 INFO L226 Difference]: Without dead ends: 223 [2022-01-31 21:20:22,974 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7436 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=6067, Invalid=18739, Unknown=0, NotChecked=0, Total=24806 [2022-01-31 21:20:22,974 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 246 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 4351 mSolverCounterSat, 272 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 4623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 272 IncrementalHoareTripleChecker+Valid, 4351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:22,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [246 Valid, 40 Invalid, 4623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [272 Valid, 4351 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-01-31 21:20:22,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2022-01-31 21:20:22,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2022-01-31 21:20:22,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 218 states have (on average 1.0229357798165137) internal successors, (223), 218 states have internal predecessors, (223), 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 21:20:22,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 227 transitions. [2022-01-31 21:20:22,997 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 227 transitions. Word has length 131 [2022-01-31 21:20:22,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:22,997 INFO L470 AbstractCegarLoop]: Abstraction has 223 states and 227 transitions. [2022-01-31 21:20:22,997 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.6075949367088607) internal successors, (127), 78 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 21:20:22,997 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 227 transitions. [2022-01-31 21:20:22,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-01-31 21:20:22,998 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:22,998 INFO L514 BasicCegarLoop]: trace histogram [46, 45, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:22,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2022-01-31 21:20:22,998 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:22,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:22,998 INFO L85 PathProgramCache]: Analyzing trace with hash -1820745669, now seen corresponding path program 37 times [2022-01-31 21:20:22,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:22,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1820117306] [2022-01-31 21:20:22,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:23,042 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 21:20:23,069 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:23,069 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:23,087 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:23,137 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:23,137 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:23,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:23,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:23,709 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:23,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:23,712 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:24,958 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:24,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1820117306] [2022-01-31 21:20:24,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1820117306] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:24,958 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:24,958 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2022-01-31 21:20:24,958 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266963619] [2022-01-31 21:20:24,958 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:24,958 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-01-31 21:20:24,958 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:24,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-01-31 21:20:24,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2200, Invalid=4772, Unknown=0, NotChecked=0, Total=6972 [2022-01-31 21:20:24,959 INFO L87 Difference]: Start difference. First operand 223 states and 227 transitions. Second operand has 81 states, 81 states have (on average 1.6049382716049383) internal successors, (130), 80 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 21:20:28,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:28,668 INFO L93 Difference]: Finished difference Result 351 states and 361 transitions. [2022-01-31 21:20:28,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-01-31 21:20:28,669 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.6049382716049383) internal successors, (130), 80 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 21:20:28,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:28,670 INFO L225 Difference]: With dead ends: 351 [2022-01-31 21:20:28,670 INFO L226 Difference]: Without dead ends: 226 [2022-01-31 21:20:28,671 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7832 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=6404, Invalid=19678, Unknown=0, NotChecked=0, Total=26082 [2022-01-31 21:20:28,671 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 301 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 4485 mSolverCounterSat, 329 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 301 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 4814 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 329 IncrementalHoareTripleChecker+Valid, 4485 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:28,672 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [301 Valid, 40 Invalid, 4814 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [329 Valid, 4485 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-01-31 21:20:28,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2022-01-31 21:20:28,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 226. [2022-01-31 21:20:28,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 221 states have (on average 1.0226244343891402) internal successors, (226), 221 states have internal predecessors, (226), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:28,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 230 transitions. [2022-01-31 21:20:28,695 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 230 transitions. Word has length 134 [2022-01-31 21:20:28,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:28,695 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 230 transitions. [2022-01-31 21:20:28,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 1.6049382716049383) internal successors, (130), 80 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 21:20:28,695 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 230 transitions. [2022-01-31 21:20:28,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-01-31 21:20:28,696 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:28,696 INFO L514 BasicCegarLoop]: trace histogram [47, 46, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:28,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2022-01-31 21:20:28,696 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:28,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:28,697 INFO L85 PathProgramCache]: Analyzing trace with hash -1697744541, now seen corresponding path program 38 times [2022-01-31 21:20:28,697 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:28,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1645625885] [2022-01-31 21:20:28,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:28,741 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 21:20:28,771 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:28,771 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:28,802 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:28,848 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 21:20:28,849 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:28,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:28,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:29,488 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:29,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:29,500 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:31,365 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:31,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1645625885] [2022-01-31 21:20:31,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1645625885] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:31,365 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:31,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [83] imperfect sequences [] total 83 [2022-01-31 21:20:31,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251110117] [2022-01-31 21:20:31,365 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:31,365 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-01-31 21:20:31,365 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:31,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-01-31 21:20:31,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=720, Invalid=6590, Unknown=0, NotChecked=0, Total=7310 [2022-01-31 21:20:31,366 INFO L87 Difference]: Start difference. First operand 226 states and 230 transitions. Second operand has 83 states, 83 states have (on average 1.6024096385542168) internal successors, (133), 82 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 21:20:34,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:34,808 INFO L93 Difference]: Finished difference Result 354 states and 363 transitions. [2022-01-31 21:20:34,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-01-31 21:20:34,808 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.6024096385542168) internal successors, (133), 82 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 21:20:34,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:34,809 INFO L225 Difference]: With dead ends: 354 [2022-01-31 21:20:34,809 INFO L226 Difference]: Without dead ends: 228 [2022-01-31 21:20:34,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3073 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=964, Invalid=16858, Unknown=0, NotChecked=0, Total=17822 [2022-01-31 21:20:34,810 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 58 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 5254 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 5307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 5254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:34,810 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 265 Invalid, 5307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 5254 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-01-31 21:20:34,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2022-01-31 21:20:34,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 228. [2022-01-31 21:20:34,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 223 states have (on average 1.0224215246636772) internal successors, (228), 223 states have internal predecessors, (228), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:34,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 232 transitions. [2022-01-31 21:20:34,829 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 232 transitions. Word has length 137 [2022-01-31 21:20:34,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:34,829 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 232 transitions. [2022-01-31 21:20:34,829 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.6024096385542168) internal successors, (133), 82 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 21:20:34,829 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 232 transitions. [2022-01-31 21:20:34,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2022-01-31 21:20:34,830 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:34,830 INFO L514 BasicCegarLoop]: trace histogram [48, 47, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:34,830 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2022-01-31 21:20:34,830 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:34,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:34,830 INFO L85 PathProgramCache]: Analyzing trace with hash -242483842, now seen corresponding path program 39 times [2022-01-31 21:20:34,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:34,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [358561379] [2022-01-31 21:20:34,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:34,872 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 21:20:34,890 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:34,890 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:34,907 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:34,943 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:34,943 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:34,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:34,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:35,603 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:35,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:35,606 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:37,512 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:37,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [358561379] [2022-01-31 21:20:37,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [358561379] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:37,512 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:37,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2022-01-31 21:20:37,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478460909] [2022-01-31 21:20:37,512 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:37,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-01-31 21:20:37,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:37,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-01-31 21:20:37,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=723, Invalid=6759, Unknown=0, NotChecked=0, Total=7482 [2022-01-31 21:20:37,514 INFO L87 Difference]: Start difference. First operand 228 states and 232 transitions. Second operand has 84 states, 84 states have (on average 1.6071428571428572) internal successors, (135), 83 states have internal predecessors, (135), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:41,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:41,265 INFO L93 Difference]: Finished difference Result 356 states and 365 transitions. [2022-01-31 21:20:41,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-01-31 21:20:41,266 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.6071428571428572) internal successors, (135), 83 states have internal predecessors, (135), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 139 [2022-01-31 21:20:41,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:41,267 INFO L225 Difference]: With dead ends: 356 [2022-01-31 21:20:41,267 INFO L226 Difference]: Without dead ends: 230 [2022-01-31 21:20:41,268 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3159 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=972, Invalid=17388, Unknown=0, NotChecked=0, Total=18360 [2022-01-31 21:20:41,268 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 59 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 6103 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 6157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 6103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:41,268 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 300 Invalid, 6157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 6103 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-01-31 21:20:41,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2022-01-31 21:20:41,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 230. [2022-01-31 21:20:41,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 225 states have (on average 1.0222222222222221) internal successors, (230), 225 states have internal predecessors, (230), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:41,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 234 transitions. [2022-01-31 21:20:41,287 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 234 transitions. Word has length 139 [2022-01-31 21:20:41,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:41,287 INFO L470 AbstractCegarLoop]: Abstraction has 230 states and 234 transitions. [2022-01-31 21:20:41,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.6071428571428572) internal successors, (135), 83 states have internal predecessors, (135), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:41,287 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 234 transitions. [2022-01-31 21:20:41,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2022-01-31 21:20:41,288 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:41,288 INFO L514 BasicCegarLoop]: trace histogram [49, 48, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:41,288 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2022-01-31 21:20:41,288 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:41,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:41,289 INFO L85 PathProgramCache]: Analyzing trace with hash -1896290599, now seen corresponding path program 40 times [2022-01-31 21:20:41,289 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:41,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [592408852] [2022-01-31 21:20:41,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:41,354 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 21:20:41,379 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:41,379 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:41,403 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:41,439 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 21:20:41,440 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:41,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:41,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:42,168 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:42,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:42,171 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:43,524 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:43,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [592408852] [2022-01-31 21:20:43,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [592408852] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:43,525 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:43,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2022-01-31 21:20:43,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678993963] [2022-01-31 21:20:43,525 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:43,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-01-31 21:20:43,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:43,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-01-31 21:20:43,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2439, Invalid=5217, Unknown=0, NotChecked=0, Total=7656 [2022-01-31 21:20:43,526 INFO L87 Difference]: Start difference. First operand 230 states and 234 transitions. Second operand has 85 states, 85 states have (on average 1.611764705882353) internal successors, (137), 84 states have internal predecessors, (137), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:47,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:47,851 INFO L93 Difference]: Finished difference Result 359 states and 369 transitions. [2022-01-31 21:20:47,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-01-31 21:20:47,852 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 1.611764705882353) internal successors, (137), 84 states have internal predecessors, (137), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 141 [2022-01-31 21:20:47,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:47,852 INFO L225 Difference]: With dead ends: 359 [2022-01-31 21:20:47,852 INFO L226 Difference]: Without dead ends: 233 [2022-01-31 21:20:47,854 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8609 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=7062, Invalid=21668, Unknown=0, NotChecked=0, Total=28730 [2022-01-31 21:20:47,855 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 577 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 5159 mSolverCounterSat, 606 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 577 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 5765 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 606 IncrementalHoareTripleChecker+Valid, 5159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:47,855 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [577 Valid, 44 Invalid, 5765 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [606 Valid, 5159 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-01-31 21:20:47,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2022-01-31 21:20:47,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 233. [2022-01-31 21:20:47,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 228 states have (on average 1.0219298245614035) internal successors, (233), 228 states have internal predecessors, (233), 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 21:20:47,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 237 transitions. [2022-01-31 21:20:47,875 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 237 transitions. Word has length 141 [2022-01-31 21:20:47,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:47,875 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 237 transitions. [2022-01-31 21:20:47,875 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 1.611764705882353) internal successors, (137), 84 states have internal predecessors, (137), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:47,875 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 237 transitions. [2022-01-31 21:20:47,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-01-31 21:20:47,876 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:47,876 INFO L514 BasicCegarLoop]: trace histogram [50, 49, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:47,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2022-01-31 21:20:47,876 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:47,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:47,877 INFO L85 PathProgramCache]: Analyzing trace with hash 392825967, now seen corresponding path program 41 times [2022-01-31 21:20:47,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:47,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1912399758] [2022-01-31 21:20:47,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:47,930 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 21:20:47,948 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:47,948 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:47,966 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:48,016 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 21:20:48,016 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:48,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:48,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:48,629 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:48,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:48,636 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:50,633 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:50,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1912399758] [2022-01-31 21:20:50,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1912399758] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:50,634 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:50,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [87] imperfect sequences [] total 87 [2022-01-31 21:20:50,634 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057065631] [2022-01-31 21:20:50,634 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:50,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-01-31 21:20:50,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:50,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-01-31 21:20:50,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=763, Invalid=7247, Unknown=0, NotChecked=0, Total=8010 [2022-01-31 21:20:50,636 INFO L87 Difference]: Start difference. First operand 233 states and 237 transitions. Second operand has 87 states, 87 states have (on average 1.6091954022988506) internal successors, (140), 86 states have internal predecessors, (140), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:54,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:54,481 INFO L93 Difference]: Finished difference Result 362 states and 371 transitions. [2022-01-31 21:20:54,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-01-31 21:20:54,481 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.6091954022988506) internal successors, (140), 86 states have internal predecessors, (140), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 144 [2022-01-31 21:20:54,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:54,482 INFO L225 Difference]: With dead ends: 362 [2022-01-31 21:20:54,483 INFO L226 Difference]: Without dead ends: 235 [2022-01-31 21:20:54,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3389 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1022, Invalid=18718, Unknown=0, NotChecked=0, Total=19740 [2022-01-31 21:20:54,484 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 61 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 5887 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 280 SdHoareTripleChecker+Invalid, 5943 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 5887 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:54,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 280 Invalid, 5943 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 5887 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-01-31 21:20:54,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2022-01-31 21:20:54,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 235. [2022-01-31 21:20:54,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 230 states have (on average 1.0217391304347827) internal successors, (235), 230 states have internal predecessors, (235), 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 21:20:54,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 239 transitions. [2022-01-31 21:20:54,507 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 239 transitions. Word has length 144 [2022-01-31 21:20:54,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:54,507 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 239 transitions. [2022-01-31 21:20:54,507 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 1.6091954022988506) internal successors, (140), 86 states have internal predecessors, (140), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:54,508 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 239 transitions. [2022-01-31 21:20:54,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2022-01-31 21:20:54,508 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:54,508 INFO L514 BasicCegarLoop]: trace histogram [51, 50, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:54,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2022-01-31 21:20:54,509 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:54,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:54,509 INFO L85 PathProgramCache]: Analyzing trace with hash 837796852, now seen corresponding path program 42 times [2022-01-31 21:20:54,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:54,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1475316105] [2022-01-31 21:20:54,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:54,551 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 21:20:54,571 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:54,571 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:54,589 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:54,639 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 21:20:54,640 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:54,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:54,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:55,184 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:55,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:55,191 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:56,627 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:56,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1475316105] [2022-01-31 21:20:56,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1475316105] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:56,627 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:56,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2022-01-31 21:20:56,627 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525320151] [2022-01-31 21:20:56,627 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:56,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2022-01-31 21:20:56,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:56,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2022-01-31 21:20:56,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2468, Invalid=5188, Unknown=0, NotChecked=0, Total=7656 [2022-01-31 21:20:56,629 INFO L87 Difference]: Start difference. First operand 235 states and 239 transitions. Second operand has 88 states, 88 states have (on average 1.6136363636363635) internal successors, (142), 87 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:01,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:21:01,003 INFO L93 Difference]: Finished difference Result 379 states and 403 transitions. [2022-01-31 21:21:01,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-01-31 21:21:01,003 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 1.6136363636363635) internal successors, (142), 87 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 146 [2022-01-31 21:21:01,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:21:01,004 INFO L225 Difference]: With dead ends: 379 [2022-01-31 21:21:01,004 INFO L226 Difference]: Without dead ends: 252 [2022-01-31 21:21:01,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 58 SyntacticMatches, 2 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8709 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=7398, Invalid=22358, Unknown=0, NotChecked=0, Total=29756 [2022-01-31 21:21:01,006 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 223 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 5438 mSolverCounterSat, 315 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 5753 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 315 IncrementalHoareTripleChecker+Valid, 5438 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:21:01,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [223 Valid, 54 Invalid, 5753 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [315 Valid, 5438 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-01-31 21:21:01,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2022-01-31 21:21:01,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 152. [2022-01-31 21:21:01,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 147 states have (on average 1.0272108843537415) internal successors, (151), 147 states have internal predecessors, (151), 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 21:21:01,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 155 transitions. [2022-01-31 21:21:01,020 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 155 transitions. Word has length 146 [2022-01-31 21:21:01,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:21:01,020 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 155 transitions. [2022-01-31 21:21:01,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 1.6136363636363635) internal successors, (142), 87 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:01,020 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 155 transitions. [2022-01-31 21:21:01,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2022-01-31 21:21:01,021 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:21:01,021 INFO L514 BasicCegarLoop]: trace histogram [53, 52, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:21:01,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2022-01-31 21:21:01,021 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:21:01,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:21:01,022 INFO L85 PathProgramCache]: Analyzing trace with hash 1465356261, now seen corresponding path program 43 times [2022-01-31 21:21:01,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:21:01,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [366346104] [2022-01-31 21:21:01,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:21:01,074 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:01,105 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:01,105 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:01,125 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:01,166 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 21:21:01,166 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:01,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:21:01,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:01,767 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:21:01,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:01,780 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:21:03,357 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:21:03,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [366346104] [2022-01-31 21:21:03,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [366346104] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:21:03,358 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:21:03,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [92] imperfect sequences [] total 92 [2022-01-31 21:21:03,358 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607219545] [2022-01-31 21:21:03,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:21:03,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2022-01-31 21:21:03,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:21:03,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2022-01-31 21:21:03,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2719, Invalid=5653, Unknown=0, NotChecked=0, Total=8372 [2022-01-31 21:21:03,359 INFO L87 Difference]: Start difference. First operand 152 states and 155 transitions. Second operand has 92 states, 92 states have (on average 1.5978260869565217) internal successors, (147), 91 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:08,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:21:08,103 INFO L93 Difference]: Finished difference Result 302 states and 314 transitions. [2022-01-31 21:21:08,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2022-01-31 21:21:08,104 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 1.5978260869565217) internal successors, (147), 91 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 151 [2022-01-31 21:21:08,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:21:08,104 INFO L225 Difference]: With dead ends: 302 [2022-01-31 21:21:08,104 INFO L226 Difference]: Without dead ends: 158 [2022-01-31 21:21:08,106 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9579 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=8151, Invalid=24429, Unknown=0, NotChecked=0, Total=32580 [2022-01-31 21:21:08,107 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 342 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 5850 mSolverCounterSat, 438 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 342 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 6288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 438 IncrementalHoareTripleChecker+Valid, 5850 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:21:08,107 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [342 Valid, 29 Invalid, 6288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [438 Valid, 5850 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-01-31 21:21:08,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-01-31 21:21:08,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 158. [2022-01-31 21:21:08,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 153 states have (on average 1.026143790849673) internal successors, (157), 153 states have internal predecessors, (157), 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 21:21:08,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 161 transitions. [2022-01-31 21:21:08,125 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 161 transitions. Word has length 151 [2022-01-31 21:21:08,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:21:08,125 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 161 transitions. [2022-01-31 21:21:08,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 1.5978260869565217) internal successors, (147), 91 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:08,126 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 161 transitions. [2022-01-31 21:21:08,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2022-01-31 21:21:08,126 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:21:08,126 INFO L514 BasicCegarLoop]: trace histogram [55, 54, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:21:08,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2022-01-31 21:21:08,127 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:21:08,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:21:08,127 INFO L85 PathProgramCache]: Analyzing trace with hash 91773051, now seen corresponding path program 44 times [2022-01-31 21:21:08,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:21:08,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1982046886] [2022-01-31 21:21:08,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:21:08,179 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 21:21:08,204 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 21:21:08,204 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:08,228 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:08,274 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 21:21:08,274 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:08,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:21:08,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:08,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:21:08,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:08,972 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:21:10,670 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:21:10,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1982046886] [2022-01-31 21:21:10,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1982046886] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:21:10,670 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:21:10,671 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [96] imperfect sequences [] total 96 [2022-01-31 21:21:10,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485460420] [2022-01-31 21:21:10,671 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:21:10,671 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2022-01-31 21:21:10,671 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:21:10,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2022-01-31 21:21:10,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2982, Invalid=6138, Unknown=0, NotChecked=0, Total=9120 [2022-01-31 21:21:10,672 INFO L87 Difference]: Start difference. First operand 158 states and 161 transitions. Second operand has 96 states, 96 states have (on average 1.59375) internal successors, (153), 95 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:15,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:21:15,790 INFO L93 Difference]: Finished difference Result 314 states and 326 transitions. [2022-01-31 21:21:15,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2022-01-31 21:21:15,791 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 1.59375) internal successors, (153), 95 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 157 [2022-01-31 21:21:15,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:21:15,791 INFO L225 Difference]: With dead ends: 314 [2022-01-31 21:21:15,792 INFO L226 Difference]: Without dead ends: 164 [2022-01-31 21:21:15,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10489 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=8940, Invalid=26592, Unknown=0, NotChecked=0, Total=35532 [2022-01-31 21:21:15,794 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 353 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 6326 mSolverCounterSat, 397 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 353 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 6723 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 397 IncrementalHoareTripleChecker+Valid, 6326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:21:15,795 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [353 Valid, 64 Invalid, 6723 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [397 Valid, 6326 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-01-31 21:21:15,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2022-01-31 21:21:15,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 164. [2022-01-31 21:21:15,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 159 states have (on average 1.0251572327044025) internal successors, (163), 159 states have internal predecessors, (163), 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 21:21:15,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 167 transitions. [2022-01-31 21:21:15,810 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 167 transitions. Word has length 157 [2022-01-31 21:21:15,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:21:15,811 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 167 transitions. [2022-01-31 21:21:15,811 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 96 states have (on average 1.59375) internal successors, (153), 95 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:15,811 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 167 transitions. [2022-01-31 21:21:15,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2022-01-31 21:21:15,812 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:21:15,812 INFO L514 BasicCegarLoop]: trace histogram [57, 56, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:21:15,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2022-01-31 21:21:15,812 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:21:15,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:21:15,812 INFO L85 PathProgramCache]: Analyzing trace with hash 911467281, now seen corresponding path program 45 times [2022-01-31 21:21:15,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:21:15,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1713231047] [2022-01-31 21:21:15,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:21:15,856 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 21:21:15,880 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:15,880 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:15,903 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:15,940 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 21:21:15,940 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:15,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:21:15,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:16,739 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:21:16,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:16,748 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 21:21:18,498 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:21:18,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1713231047] [2022-01-31 21:21:18,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1713231047] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:21:18,498 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:21:18,498 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [100] imperfect sequences [] total 100 [2022-01-31 21:21:18,498 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797745535] [2022-01-31 21:21:18,498 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:21:18,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-01-31 21:21:18,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:21:18,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-01-31 21:21:18,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3257, Invalid=6643, Unknown=0, NotChecked=0, Total=9900 [2022-01-31 21:21:18,500 INFO L87 Difference]: Start difference. First operand 164 states and 167 transitions. Second operand has 100 states, 100 states have (on average 1.59) internal successors, (159), 99 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:23,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:21:23,993 INFO L93 Difference]: Finished difference Result 326 states and 338 transitions. [2022-01-31 21:21:23,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2022-01-31 21:21:23,993 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 1.59) internal successors, (159), 99 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 163 [2022-01-31 21:21:23,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:21:23,994 INFO L225 Difference]: With dead ends: 326 [2022-01-31 21:21:23,994 INFO L226 Difference]: Without dead ends: 170 [2022-01-31 21:21:23,996 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11439 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=9765, Invalid=28847, Unknown=0, NotChecked=0, Total=38612 [2022-01-31 21:21:23,996 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 422 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 6755 mSolverCounterSat, 411 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 422 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 7166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 411 IncrementalHoareTripleChecker+Valid, 6755 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:21:23,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [422 Valid, 59 Invalid, 7166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [411 Valid, 6755 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-01-31 21:21:23,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2022-01-31 21:21:24,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 170. [2022-01-31 21:21:24,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 165 states have (on average 1.0242424242424242) internal successors, (169), 165 states have internal predecessors, (169), 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 21:21:24,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 173 transitions. [2022-01-31 21:21:24,007 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 173 transitions. Word has length 163 [2022-01-31 21:21:24,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:21:24,007 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 173 transitions. [2022-01-31 21:21:24,007 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 1.59) internal successors, (159), 99 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:24,007 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 173 transitions. [2022-01-31 21:21:24,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2022-01-31 21:21:24,008 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:21:24,008 INFO L514 BasicCegarLoop]: trace histogram [59, 58, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:21:24,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2022-01-31 21:21:24,008 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:21:24,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:21:24,009 INFO L85 PathProgramCache]: Analyzing trace with hash -1258811481, now seen corresponding path program 46 times [2022-01-31 21:21:24,009 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:21:24,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1226840908] [2022-01-31 21:21:24,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:21:24,069 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:24,099 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:24,100 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:24,122 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:24,184 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 21:21:24,185 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:24,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:21:24,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:24,929 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:21:24,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:24,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:21:26,763 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:21:26,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1226840908] [2022-01-31 21:21:26,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1226840908] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:21:26,764 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:21:26,764 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [103] imperfect sequences [] total 103 [2022-01-31 21:21:26,764 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364793866] [2022-01-31 21:21:26,764 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:21:26,764 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-01-31 21:21:26,764 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:21:26,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-01-31 21:21:26,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3442, Invalid=7064, Unknown=0, NotChecked=0, Total=10506 [2022-01-31 21:21:26,766 INFO L87 Difference]: Start difference. First operand 170 states and 173 transitions. Second operand has 103 states, 103 states have (on average 1.6019417475728155) internal successors, (165), 102 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:32,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:21:32,627 INFO L93 Difference]: Finished difference Result 337 states and 348 transitions. [2022-01-31 21:21:32,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2022-01-31 21:21:32,627 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.6019417475728155) internal successors, (165), 102 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 169 [2022-01-31 21:21:32,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:21:32,628 INFO L225 Difference]: With dead ends: 337 [2022-01-31 21:21:32,628 INFO L226 Difference]: Without dead ends: 175 [2022-01-31 21:21:32,630 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 65 SyntacticMatches, 3 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12185 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=10320, Invalid=30686, Unknown=0, NotChecked=0, Total=41006 [2022-01-31 21:21:32,630 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 316 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 7230 mSolverCounterSat, 421 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 316 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 7651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 421 IncrementalHoareTripleChecker+Valid, 7230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:21:32,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [316 Valid, 44 Invalid, 7651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [421 Valid, 7230 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-01-31 21:21:32,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2022-01-31 21:21:32,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2022-01-31 21:21:32,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 170 states have (on average 1.0235294117647058) internal successors, (174), 170 states have internal predecessors, (174), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:32,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 178 transitions. [2022-01-31 21:21:32,643 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 178 transitions. Word has length 169 [2022-01-31 21:21:32,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:21:32,644 INFO L470 AbstractCegarLoop]: Abstraction has 175 states and 178 transitions. [2022-01-31 21:21:32,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.6019417475728155) internal successors, (165), 102 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:32,644 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 178 transitions. [2022-01-31 21:21:32,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2022-01-31 21:21:32,644 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:21:32,644 INFO L514 BasicCegarLoop]: trace histogram [61, 60, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:21:32,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2022-01-31 21:21:32,645 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:21:32,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:21:32,645 INFO L85 PathProgramCache]: Analyzing trace with hash 1482932710, now seen corresponding path program 47 times [2022-01-31 21:21:32,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:21:32,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849905065] [2022-01-31 21:21:32,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:21:32,689 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 21:21:32,712 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:32,712 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:32,735 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:32,800 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 21:21:32,800 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:32,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:21:32,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:33,677 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:21:33,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:33,680 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 21:21:35,669 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:21:35,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849905065] [2022-01-31 21:21:35,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1849905065] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:21:35,670 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:21:35,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [106] imperfect sequences [] total 106 [2022-01-31 21:21:35,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063249240] [2022-01-31 21:21:35,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:21:35,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-01-31 21:21:35,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:21:35,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-01-31 21:21:35,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3725, Invalid=8047, Unknown=0, NotChecked=0, Total=11772 [2022-01-31 21:21:35,672 INFO L87 Difference]: Start difference. First operand 175 states and 178 transitions. Second operand has 106 states, 106 states have (on average 1.6037735849056605) internal successors, (170), 105 states have internal predecessors, (170), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:41,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:21:41,806 INFO L93 Difference]: Finished difference Result 465 states and 476 transitions. [2022-01-31 21:21:41,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2022-01-31 21:21:41,806 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 1.6037735849056605) internal successors, (170), 105 states have internal predecessors, (170), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 174 [2022-01-31 21:21:41,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:21:41,807 INFO L225 Difference]: With dead ends: 465 [2022-01-31 21:21:41,807 INFO L226 Difference]: Without dead ends: 298 [2022-01-31 21:21:41,809 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 67 SyntacticMatches, 2 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13487 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=10924, Invalid=33808, Unknown=0, NotChecked=0, Total=44732 [2022-01-31 21:21:41,810 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 265 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 7587 mSolverCounterSat, 306 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 265 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 7893 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 306 IncrementalHoareTripleChecker+Valid, 7587 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:21:41,810 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [265 Valid, 25 Invalid, 7893 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [306 Valid, 7587 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-01-31 21:21:41,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2022-01-31 21:21:41,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 298. [2022-01-31 21:21:41,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 293 states have (on average 1.0170648464163823) internal successors, (298), 293 states have internal predecessors, (298), 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 21:21:41,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 302 transitions. [2022-01-31 21:21:41,839 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 302 transitions. Word has length 174 [2022-01-31 21:21:41,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:21:41,840 INFO L470 AbstractCegarLoop]: Abstraction has 298 states and 302 transitions. [2022-01-31 21:21:41,840 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 1.6037735849056605) internal successors, (170), 105 states have internal predecessors, (170), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:41,840 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 302 transitions. [2022-01-31 21:21:41,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2022-01-31 21:21:41,848 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:21:41,848 INFO L514 BasicCegarLoop]: trace histogram [62, 61, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:21:41,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2022-01-31 21:21:41,848 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:21:41,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:21:41,848 INFO L85 PathProgramCache]: Analyzing trace with hash -909683176, now seen corresponding path program 48 times [2022-01-31 21:21:41,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:21:41,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2026510842] [2022-01-31 21:21:41,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:21:41,909 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 21:21:41,932 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:41,933 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:41,955 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:42,017 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 21:21:42,017 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:42,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:21:42,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:42,904 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:21:42,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:42,907 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:21:45,835 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:21:45,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2026510842] [2022-01-31 21:21:45,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2026510842] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:21:45,836 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:21:45,836 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [108] imperfect sequences [] total 108 [2022-01-31 21:21:45,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387065311] [2022-01-31 21:21:45,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:21:45,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2022-01-31 21:21:45,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:21:45,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2022-01-31 21:21:45,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1150, Invalid=11060, Unknown=0, NotChecked=0, Total=12210 [2022-01-31 21:21:45,837 INFO L87 Difference]: Start difference. First operand 298 states and 302 transitions. Second operand has 108 states, 108 states have (on average 1.6018518518518519) internal successors, (173), 107 states have internal predecessors, (173), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:51,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:21:51,595 INFO L93 Difference]: Finished difference Result 468 states and 477 transitions. [2022-01-31 21:21:51,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-01-31 21:21:51,595 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 1.6018518518518519) internal successors, (173), 107 states have internal predecessors, (173), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 177 [2022-01-31 21:21:51,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:21:51,597 INFO L225 Difference]: With dead ends: 468 [2022-01-31 21:21:51,597 INFO L226 Difference]: Without dead ends: 300 [2022-01-31 21:21:51,598 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5138 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=1469, Invalid=28633, Unknown=0, NotChecked=0, Total=30102 [2022-01-31 21:21:51,598 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 73 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 9045 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 9113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 9045 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:21:51,598 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 350 Invalid, 9113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 9045 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-01-31 21:21:51,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2022-01-31 21:21:51,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 300. [2022-01-31 21:21:51,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 300 states, 295 states have (on average 1.0169491525423728) internal successors, (300), 295 states have internal predecessors, (300), 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 21:21:51,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 304 transitions. [2022-01-31 21:21:51,628 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 304 transitions. Word has length 177 [2022-01-31 21:21:51,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:21:51,629 INFO L470 AbstractCegarLoop]: Abstraction has 300 states and 304 transitions. [2022-01-31 21:21:51,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 1.6018518518518519) internal successors, (173), 107 states have internal predecessors, (173), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:51,629 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 304 transitions. [2022-01-31 21:21:51,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2022-01-31 21:21:51,630 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:21:51,630 INFO L514 BasicCegarLoop]: trace histogram [63, 62, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:21:51,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2022-01-31 21:21:51,630 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:21:51,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:21:51,630 INFO L85 PathProgramCache]: Analyzing trace with hash 1251304243, now seen corresponding path program 49 times [2022-01-31 21:21:51,630 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:21:51,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1135225939] [2022-01-31 21:21:51,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:21:51,689 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 21:21:51,714 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:51,714 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:51,739 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:51,788 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 21:21:51,788 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:51,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:21:51,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:52,754 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:21:52,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:52,757 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:21:54,847 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:21:54,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1135225939] [2022-01-31 21:21:54,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1135225939] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:21:54,847 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:21:54,847 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [109] imperfect sequences [] total 109 [2022-01-31 21:21:54,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071101794] [2022-01-31 21:21:54,847 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:21:54,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2022-01-31 21:21:54,848 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:21:54,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2022-01-31 21:21:54,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3988, Invalid=8444, Unknown=0, NotChecked=0, Total=12432 [2022-01-31 21:21:54,849 INFO L87 Difference]: Start difference. First operand 300 states and 304 transitions. Second operand has 109 states, 109 states have (on average 1.6055045871559632) internal successors, (175), 108 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:01,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:22:01,494 INFO L93 Difference]: Finished difference Result 471 states and 481 transitions. [2022-01-31 21:22:01,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2022-01-31 21:22:01,494 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 1.6055045871559632) internal successors, (175), 108 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 179 [2022-01-31 21:22:01,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:22:01,495 INFO L225 Difference]: With dead ends: 471 [2022-01-31 21:22:01,495 INFO L226 Difference]: Without dead ends: 303 [2022-01-31 21:22:01,497 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14261 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=11641, Invalid=35665, Unknown=0, NotChecked=0, Total=47306 [2022-01-31 21:22:01,498 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 270 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 8528 mSolverCounterSat, 309 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 270 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 8837 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 309 IncrementalHoareTripleChecker+Valid, 8528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:22:01,498 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [270 Valid, 64 Invalid, 8837 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [309 Valid, 8528 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-01-31 21:22:01,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2022-01-31 21:22:01,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 303. [2022-01-31 21:22:01,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 298 states have (on average 1.016778523489933) internal successors, (303), 298 states have internal predecessors, (303), 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 21:22:01,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 307 transitions. [2022-01-31 21:22:01,520 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 307 transitions. Word has length 179 [2022-01-31 21:22:01,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:22:01,520 INFO L470 AbstractCegarLoop]: Abstraction has 303 states and 307 transitions. [2022-01-31 21:22:01,521 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 1.6055045871559632) internal successors, (175), 108 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:01,521 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 307 transitions. [2022-01-31 21:22:01,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2022-01-31 21:22:01,522 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:22:01,522 INFO L514 BasicCegarLoop]: trace histogram [64, 63, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:22:01,522 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2022-01-31 21:22:01,522 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:22:01,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:22:01,522 INFO L85 PathProgramCache]: Analyzing trace with hash 882663317, now seen corresponding path program 50 times [2022-01-31 21:22:01,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:22:01,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284902383] [2022-01-31 21:22:01,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:22:01,583 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 21:22:01,605 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:01,606 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:01,635 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:01,680 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 21:22:01,680 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:01,681 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:22:01,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:02,680 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:22:02,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:02,682 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:22:04,818 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:22:04,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284902383] [2022-01-31 21:22:04,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1284902383] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:22:04,818 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:22:04,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [111] imperfect sequences [] total 111 [2022-01-31 21:22:04,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004314479] [2022-01-31 21:22:04,818 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:22:04,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2022-01-31 21:22:04,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:22:04,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2022-01-31 21:22:04,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4078, Invalid=8804, Unknown=0, NotChecked=0, Total=12882 [2022-01-31 21:22:04,820 INFO L87 Difference]: Start difference. First operand 303 states and 307 transitions. Second operand has 111 states, 111 states have (on average 1.6036036036036037) internal successors, (178), 110 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:11,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:22:11,580 INFO L93 Difference]: Finished difference Result 475 states and 485 transitions. [2022-01-31 21:22:11,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2022-01-31 21:22:11,581 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 1.6036036036036037) internal successors, (178), 110 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 182 [2022-01-31 21:22:11,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:22:11,582 INFO L225 Difference]: With dead ends: 475 [2022-01-31 21:22:11,582 INFO L226 Difference]: Without dead ends: 306 [2022-01-31 21:22:11,584 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14801 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=11972, Invalid=37090, Unknown=0, NotChecked=0, Total=49062 [2022-01-31 21:22:11,584 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 339 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 8564 mSolverCounterSat, 380 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 8944 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 380 IncrementalHoareTripleChecker+Valid, 8564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:22:11,584 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [339 Valid, 55 Invalid, 8944 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [380 Valid, 8564 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-01-31 21:22:11,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2022-01-31 21:22:11,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 306. [2022-01-31 21:22:11,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 301 states have (on average 1.0166112956810631) internal successors, (306), 301 states have internal predecessors, (306), 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 21:22:11,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 310 transitions. [2022-01-31 21:22:11,609 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 310 transitions. Word has length 182 [2022-01-31 21:22:11,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:22:11,609 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 310 transitions. [2022-01-31 21:22:11,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 1.6036036036036037) internal successors, (178), 110 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:11,610 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 310 transitions. [2022-01-31 21:22:11,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2022-01-31 21:22:11,611 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:22:11,611 INFO L514 BasicCegarLoop]: trace histogram [65, 64, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:22:11,611 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2022-01-31 21:22:11,611 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:22:11,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:22:11,611 INFO L85 PathProgramCache]: Analyzing trace with hash -727293111, now seen corresponding path program 51 times [2022-01-31 21:22:11,611 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:22:11,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [969250142] [2022-01-31 21:22:11,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:22:11,670 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 21:22:11,700 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 21:22:11,700 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:11,722 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:11,784 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 21:22:11,784 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:11,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:22:11,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:12,757 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:22:12,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:12,761 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:22:15,975 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:22:15,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [969250142] [2022-01-31 21:22:15,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [969250142] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:22:15,975 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:22:15,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [113] imperfect sequences [] total 113 [2022-01-31 21:22:15,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943538756] [2022-01-31 21:22:15,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:22:15,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-01-31 21:22:15,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:22:15,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-01-31 21:22:15,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1248, Invalid=12092, Unknown=0, NotChecked=0, Total=13340 [2022-01-31 21:22:15,977 INFO L87 Difference]: Start difference. First operand 306 states and 310 transitions. Second operand has 113 states, 113 states have (on average 1.6017699115044248) internal successors, (181), 112 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:22,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:22:22,179 INFO L93 Difference]: Finished difference Result 478 states and 487 transitions. [2022-01-31 21:22:22,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-01-31 21:22:22,179 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 1.6017699115044248) internal successors, (181), 112 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 185 [2022-01-31 21:22:22,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:22:22,180 INFO L225 Difference]: With dead ends: 478 [2022-01-31 21:22:22,180 INFO L226 Difference]: Without dead ends: 308 [2022-01-31 21:22:22,185 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5614 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=1582, Invalid=31360, Unknown=0, NotChecked=0, Total=32942 [2022-01-31 21:22:22,185 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 76 mSDsluCounter, 352 mSDsCounter, 0 mSdLazyCounter, 9874 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 9945 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 9874 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:22:22,186 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 365 Invalid, 9945 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 9874 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-01-31 21:22:22,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2022-01-31 21:22:22,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 308. [2022-01-31 21:22:22,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 303 states have (on average 1.0165016501650166) internal successors, (308), 303 states have internal predecessors, (308), 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 21:22:22,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 312 transitions. [2022-01-31 21:22:22,216 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 312 transitions. Word has length 185 [2022-01-31 21:22:22,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:22:22,217 INFO L470 AbstractCegarLoop]: Abstraction has 308 states and 312 transitions. [2022-01-31 21:22:22,217 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 1.6017699115044248) internal successors, (181), 112 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:22,217 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 312 transitions. [2022-01-31 21:22:22,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2022-01-31 21:22:22,218 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:22:22,218 INFO L514 BasicCegarLoop]: trace histogram [66, 65, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:22:22,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2022-01-31 21:22:22,218 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:22:22,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:22:22,218 INFO L85 PathProgramCache]: Analyzing trace with hash -1001446044, now seen corresponding path program 52 times [2022-01-31 21:22:22,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:22:22,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [986937351] [2022-01-31 21:22:22,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:22:22,280 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 21:22:22,305 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:22,305 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:22,323 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:22,372 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 21:22:22,372 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:22,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:22:22,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:23,372 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:22:23,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:23,374 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:22:25,585 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:22:25,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [986937351] [2022-01-31 21:22:25,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [986937351] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:22:25,586 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:22:25,586 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [114] imperfect sequences [] total 114 [2022-01-31 21:22:25,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201159645] [2022-01-31 21:22:25,586 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:22:25,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2022-01-31 21:22:25,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:22:25,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2022-01-31 21:22:25,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4185, Invalid=8697, Unknown=0, NotChecked=0, Total=12882 [2022-01-31 21:22:25,588 INFO L87 Difference]: Start difference. First operand 308 states and 312 transitions. Second operand has 114 states, 114 states have (on average 1.605263157894737) internal successors, (183), 113 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:32,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:22:32,674 INFO L93 Difference]: Finished difference Result 493 states and 515 transitions. [2022-01-31 21:22:32,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-01-31 21:22:32,675 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 114 states have (on average 1.605263157894737) internal successors, (183), 113 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 187 [2022-01-31 21:22:32,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:22:32,676 INFO L225 Difference]: With dead ends: 493 [2022-01-31 21:22:32,676 INFO L226 Difference]: Without dead ends: 323 [2022-01-31 21:22:32,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14943 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=12549, Invalid=37851, Unknown=0, NotChecked=0, Total=50400 [2022-01-31 21:22:32,678 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 351 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 8934 mSolverCounterSat, 267 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 351 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 9201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 267 IncrementalHoareTripleChecker+Valid, 8934 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:22:32,678 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [351 Valid, 39 Invalid, 9201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [267 Valid, 8934 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-01-31 21:22:32,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2022-01-31 21:22:32,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 193. [2022-01-31 21:22:32,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0212765957446808) internal successors, (192), 188 states have internal predecessors, (192), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:32,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 196 transitions. [2022-01-31 21:22:32,700 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 196 transitions. Word has length 187 [2022-01-31 21:22:32,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:22:32,700 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 196 transitions. [2022-01-31 21:22:32,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 114 states, 114 states have (on average 1.605263157894737) internal successors, (183), 113 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:32,700 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 196 transitions. [2022-01-31 21:22:32,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2022-01-31 21:22:32,701 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:22:32,701 INFO L514 BasicCegarLoop]: trace histogram [68, 67, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:22:32,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2022-01-31 21:22:32,701 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:22:32,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:22:32,702 INFO L85 PathProgramCache]: Analyzing trace with hash 47932745, now seen corresponding path program 53 times [2022-01-31 21:22:32,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:22:32,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [255639045] [2022-01-31 21:22:32,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:22:32,747 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 21:22:32,777 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:32,777 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:32,806 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:32,853 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 21:22:32,853 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:32,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:22:32,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:33,844 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:22:33,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:33,846 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:22:37,286 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:22:37,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [255639045] [2022-01-31 21:22:37,286 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [255639045] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:22:37,286 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:22:37,286 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [117] imperfect sequences [] total 117 [2022-01-31 21:22:37,286 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92593819] [2022-01-31 21:22:37,287 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:22:37,287 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2022-01-31 21:22:37,287 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:22:37,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2022-01-31 21:22:37,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1303, Invalid=12977, Unknown=0, NotChecked=0, Total=14280 [2022-01-31 21:22:37,289 INFO L87 Difference]: Start difference. First operand 193 states and 196 transitions. Second operand has 117 states, 117 states have (on average 1.606837606837607) internal successors, (188), 116 states have internal predecessors, (188), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:44,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:22:44,219 INFO L93 Difference]: Finished difference Result 514 states and 524 transitions. [2022-01-31 21:22:44,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-01-31 21:22:44,219 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.606837606837607) internal successors, (188), 116 states have internal predecessors, (188), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 192 [2022-01-31 21:22:44,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:22:44,220 INFO L225 Difference]: With dead ends: 514 [2022-01-31 21:22:44,220 INFO L226 Difference]: Without dead ends: 329 [2022-01-31 21:22:44,221 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6038 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=1652, Invalid=33880, Unknown=0, NotChecked=0, Total=35532 [2022-01-31 21:22:44,222 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 79 mSDsluCounter, 377 mSDsCounter, 0 mSdLazyCounter, 11029 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 390 SdHoareTripleChecker+Invalid, 11104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 11029 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:22:44,222 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 390 Invalid, 11104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 11029 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-01-31 21:22:44,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2022-01-31 21:22:44,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 329. [2022-01-31 21:22:44,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 324 states have (on average 1.0154320987654322) internal successors, (329), 324 states have internal predecessors, (329), 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 21:22:44,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 333 transitions. [2022-01-31 21:22:44,247 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 333 transitions. Word has length 192 [2022-01-31 21:22:44,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:22:44,247 INFO L470 AbstractCegarLoop]: Abstraction has 329 states and 333 transitions. [2022-01-31 21:22:44,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 1.606837606837607) internal successors, (188), 116 states have internal predecessors, (188), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:44,248 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 333 transitions. [2022-01-31 21:22:44,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2022-01-31 21:22:44,248 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:22:44,249 INFO L514 BasicCegarLoop]: trace histogram [69, 68, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:22:44,249 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2022-01-31 21:22:44,249 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:22:44,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:22:44,249 INFO L85 PathProgramCache]: Analyzing trace with hash 1056186062, now seen corresponding path program 54 times [2022-01-31 21:22:44,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:22:44,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [164750102] [2022-01-31 21:22:44,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:22:44,301 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 21:22:44,325 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:44,325 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:44,343 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:44,394 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 21:22:44,394 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:44,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:22:44,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:45,475 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:22:45,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:45,489 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:22:47,968 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:22:47,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [164750102] [2022-01-31 21:22:47,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [164750102] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:22:47,969 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:22:47,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [118] imperfect sequences [] total 118 [2022-01-31 21:22:47,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147711902] [2022-01-31 21:22:47,969 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:22:47,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2022-01-31 21:22:47,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:22:47,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2022-01-31 21:22:47,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4543, Invalid=9977, Unknown=0, NotChecked=0, Total=14520 [2022-01-31 21:22:47,971 INFO L87 Difference]: Start difference. First operand 329 states and 333 transitions. Second operand has 118 states, 118 states have (on average 1.6101694915254237) internal successors, (190), 117 states have internal predecessors, (190), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:55,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:22:55,745 INFO L93 Difference]: Finished difference Result 517 states and 527 transitions. [2022-01-31 21:22:55,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2022-01-31 21:22:55,746 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 118 states have (on average 1.6101694915254237) internal successors, (190), 117 states have internal predecessors, (190), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 194 [2022-01-31 21:22:55,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:22:55,747 INFO L225 Difference]: With dead ends: 517 [2022-01-31 21:22:55,747 INFO L226 Difference]: Without dead ends: 332 [2022-01-31 21:22:55,749 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16685 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=13354, Invalid=42106, Unknown=0, NotChecked=0, Total=55460 [2022-01-31 21:22:55,749 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 369 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 9869 mSolverCounterSat, 412 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 369 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 10281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 412 IncrementalHoareTripleChecker+Valid, 9869 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:22:55,750 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [369 Valid, 45 Invalid, 10281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [412 Valid, 9869 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-01-31 21:22:55,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2022-01-31 21:22:55,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 332. [2022-01-31 21:22:55,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 332 states, 327 states have (on average 1.0152905198776758) internal successors, (332), 327 states have internal predecessors, (332), 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 21:22:55,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 336 transitions. [2022-01-31 21:22:55,782 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 336 transitions. Word has length 194 [2022-01-31 21:22:55,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:22:55,782 INFO L470 AbstractCegarLoop]: Abstraction has 332 states and 336 transitions. [2022-01-31 21:22:55,782 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 118 states have (on average 1.6101694915254237) internal successors, (190), 117 states have internal predecessors, (190), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:55,782 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 336 transitions. [2022-01-31 21:22:55,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2022-01-31 21:22:55,783 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:22:55,783 INFO L514 BasicCegarLoop]: trace histogram [70, 69, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:22:55,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2022-01-31 21:22:55,784 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:22:55,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:22:55,784 INFO L85 PathProgramCache]: Analyzing trace with hash 585833136, now seen corresponding path program 55 times [2022-01-31 21:22:55,784 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:22:55,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049101618] [2022-01-31 21:22:55,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:22:55,828 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 21:22:55,860 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 21:22:55,860 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:55,886 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:55,937 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:55,937 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:55,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:22:55,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:56,900 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:22:56,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:56,908 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:22:59,400 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:22:59,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2049101618] [2022-01-31 21:22:59,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2049101618] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:22:59,400 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:22:59,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [120] imperfect sequences [] total 120 [2022-01-31 21:22:59,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779144177] [2022-01-31 21:22:59,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:22:59,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2022-01-31 21:22:59,401 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:22:59,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2022-01-31 21:22:59,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4608, Invalid=9672, Unknown=0, NotChecked=0, Total=14280 [2022-01-31 21:22:59,402 INFO L87 Difference]: Start difference. First operand 332 states and 336 transitions. Second operand has 120 states, 120 states have (on average 1.6083333333333334) internal successors, (193), 119 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:07,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:23:07,340 INFO L93 Difference]: Finished difference Result 527 states and 543 transitions. [2022-01-31 21:23:07,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2022-01-31 21:23:07,341 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 120 states have (on average 1.6083333333333334) internal successors, (193), 119 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 197 [2022-01-31 21:23:07,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:23:07,342 INFO L225 Difference]: With dead ends: 527 [2022-01-31 21:23:07,342 INFO L226 Difference]: Without dead ends: 341 [2022-01-31 21:23:07,345 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16576 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=13818, Invalid=42114, Unknown=0, NotChecked=0, Total=55932 [2022-01-31 21:23:07,345 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 371 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 10070 mSolverCounterSat, 422 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 371 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 10492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 422 IncrementalHoareTripleChecker+Valid, 10070 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:23:07,345 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [371 Valid, 39 Invalid, 10492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [422 Valid, 10070 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-01-31 21:23:07,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2022-01-31 21:23:07,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 203. [2022-01-31 21:23:07,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 198 states have (on average 1.02020202020202) internal successors, (202), 198 states have internal predecessors, (202), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:07,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 206 transitions. [2022-01-31 21:23:07,391 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 206 transitions. Word has length 197 [2022-01-31 21:23:07,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:23:07,392 INFO L470 AbstractCegarLoop]: Abstraction has 203 states and 206 transitions. [2022-01-31 21:23:07,392 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 120 states, 120 states have (on average 1.6083333333333334) internal successors, (193), 119 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:07,392 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 206 transitions. [2022-01-31 21:23:07,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2022-01-31 21:23:07,393 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:23:07,393 INFO L514 BasicCegarLoop]: trace histogram [72, 71, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:23:07,393 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2022-01-31 21:23:07,393 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:23:07,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:23:07,393 INFO L85 PathProgramCache]: Analyzing trace with hash 49980669, now seen corresponding path program 56 times [2022-01-31 21:23:07,393 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:23:07,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1910718534] [2022-01-31 21:23:07,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:23:07,446 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 21:23:07,479 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:07,479 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:07,503 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:07,540 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:07,541 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:07,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:23:07,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:23:08,618 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:23:08,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:23:08,622 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:23:11,320 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:23:11,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1910718534] [2022-01-31 21:23:11,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1910718534] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:23:11,320 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:23:11,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [123] imperfect sequences [] total 123 [2022-01-31 21:23:11,320 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414838585] [2022-01-31 21:23:11,320 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:23:11,320 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-01-31 21:23:11,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:23:11,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-01-31 21:23:11,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4932, Invalid=10818, Unknown=0, NotChecked=0, Total=15750 [2022-01-31 21:23:11,322 INFO L87 Difference]: Start difference. First operand 203 states and 206 transitions. Second operand has 123 states, 123 states have (on average 1.6097560975609757) internal successors, (198), 122 states have internal predecessors, (198), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:19,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:23:19,657 INFO L93 Difference]: Finished difference Result 543 states and 554 transitions. [2022-01-31 21:23:19,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2022-01-31 21:23:19,657 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.6097560975609757) internal successors, (198), 122 states have internal predecessors, (198), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 202 [2022-01-31 21:23:19,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:23:19,658 INFO L225 Difference]: With dead ends: 543 [2022-01-31 21:23:19,658 INFO L226 Difference]: Without dead ends: 348 [2022-01-31 21:23:19,661 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 244 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18143 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=14510, Invalid=45760, Unknown=0, NotChecked=0, Total=60270 [2022-01-31 21:23:19,661 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 308 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 10564 mSolverCounterSat, 352 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 308 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 10916 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 352 IncrementalHoareTripleChecker+Valid, 10564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:23:19,661 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [308 Valid, 35 Invalid, 10916 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [352 Valid, 10564 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-01-31 21:23:19,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2022-01-31 21:23:19,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 348. [2022-01-31 21:23:19,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 348 states, 343 states have (on average 1.0145772594752187) internal successors, (348), 343 states have internal predecessors, (348), 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 21:23:19,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 352 transitions. [2022-01-31 21:23:19,692 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 352 transitions. Word has length 202 [2022-01-31 21:23:19,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:23:19,693 INFO L470 AbstractCegarLoop]: Abstraction has 348 states and 352 transitions. [2022-01-31 21:23:19,693 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.6097560975609757) internal successors, (198), 122 states have internal predecessors, (198), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:19,693 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 352 transitions. [2022-01-31 21:23:19,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2022-01-31 21:23:19,694 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:23:19,694 INFO L514 BasicCegarLoop]: trace histogram [73, 72, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:23:19,694 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2022-01-31 21:23:19,694 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:23:19,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:23:19,695 INFO L85 PathProgramCache]: Analyzing trace with hash -2094215327, now seen corresponding path program 57 times [2022-01-31 21:23:19,695 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:23:19,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [466162718] [2022-01-31 21:23:19,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:23:19,753 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 21:23:19,789 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:19,789 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:19,812 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:19,876 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:19,876 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:19,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:23:19,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:23:20,991 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:23:20,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:23:20,993 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:23:24,918 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:23:24,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [466162718] [2022-01-31 21:23:24,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [466162718] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:23:24,918 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:23:24,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [125] imperfect sequences [] total 125 [2022-01-31 21:23:24,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572679121] [2022-01-31 21:23:24,918 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:23:24,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2022-01-31 21:23:24,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:23:24,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2022-01-31 21:23:24,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1462, Invalid=14794, Unknown=0, NotChecked=0, Total=16256 [2022-01-31 21:23:24,920 INFO L87 Difference]: Start difference. First operand 348 states and 352 transitions. Second operand has 125 states, 125 states have (on average 1.608) internal successors, (201), 124 states have internal predecessors, (201), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:32,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:23:32,799 INFO L93 Difference]: Finished difference Result 546 states and 555 transitions. [2022-01-31 21:23:32,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-01-31 21:23:32,800 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 1.608) internal successors, (201), 124 states have internal predecessors, (201), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 205 [2022-01-31 21:23:32,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:23:32,801 INFO L225 Difference]: With dead ends: 546 [2022-01-31 21:23:32,801 INFO L226 Difference]: Without dead ends: 350 [2022-01-31 21:23:32,803 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 79 SyntacticMatches, 2 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6882 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=1836, Invalid=38766, Unknown=0, NotChecked=0, Total=40602 [2022-01-31 21:23:32,804 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 84 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 12560 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 415 SdHoareTripleChecker+Invalid, 12639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 12560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:23:32,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 415 Invalid, 12639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 12560 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2022-01-31 21:23:32,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2022-01-31 21:23:32,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 350. [2022-01-31 21:23:32,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 350 states, 345 states have (on average 1.0144927536231885) internal successors, (350), 345 states have internal predecessors, (350), 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 21:23:32,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 354 transitions. [2022-01-31 21:23:32,858 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 354 transitions. Word has length 205 [2022-01-31 21:23:32,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:23:32,858 INFO L470 AbstractCegarLoop]: Abstraction has 350 states and 354 transitions. [2022-01-31 21:23:32,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 1.608) internal successors, (201), 124 states have internal predecessors, (201), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:32,859 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 354 transitions. [2022-01-31 21:23:32,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2022-01-31 21:23:32,859 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:23:32,860 INFO L514 BasicCegarLoop]: trace histogram [74, 73, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:23:32,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2022-01-31 21:23:32,860 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:23:32,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:23:32,860 INFO L85 PathProgramCache]: Analyzing trace with hash 1292006908, now seen corresponding path program 58 times [2022-01-31 21:23:32,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:23:32,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2101999054] [2022-01-31 21:23:32,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:23:32,899 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 21:23:32,918 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:32,918 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:32,936 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:32,973 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 21:23:32,974 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:32,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:23:32,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:23:33,964 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:23:33,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:23:33,976 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:23:36,717 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:23:36,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2101999054] [2022-01-31 21:23:36,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2101999054] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:23:36,717 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:23:36,717 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [126] imperfect sequences [] total 126 [2022-01-31 21:23:36,717 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866806990] [2022-01-31 21:23:36,717 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:23:36,718 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 126 states [2022-01-31 21:23:36,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:23:36,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2022-01-31 21:23:36,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5051, Invalid=10699, Unknown=0, NotChecked=0, Total=15750 [2022-01-31 21:23:36,720 INFO L87 Difference]: Start difference. First operand 350 states and 354 transitions. Second operand has 126 states, 126 states have (on average 1.6111111111111112) internal successors, (203), 125 states have internal predecessors, (203), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:45,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:23:45,496 INFO L93 Difference]: Finished difference Result 555 states and 571 transitions. [2022-01-31 21:23:45,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2022-01-31 21:23:45,497 INFO L78 Accepts]: Start accepts. Automaton has has 126 states, 126 states have (on average 1.6111111111111112) internal successors, (203), 125 states have internal predecessors, (203), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 207 [2022-01-31 21:23:45,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:23:45,497 INFO L225 Difference]: With dead ends: 555 [2022-01-31 21:23:45,497 INFO L226 Difference]: Without dead ends: 359 [2022-01-31 21:23:45,501 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 247 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18293 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=15147, Invalid=46605, Unknown=0, NotChecked=0, Total=61752 [2022-01-31 21:23:45,501 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 391 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 11199 mSolverCounterSat, 368 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 391 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 11567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 368 IncrementalHoareTripleChecker+Valid, 11199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:23:45,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [391 Valid, 44 Invalid, 11567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [368 Valid, 11199 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2022-01-31 21:23:45,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2022-01-31 21:23:45,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 213. [2022-01-31 21:23:45,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 208 states have (on average 1.0192307692307692) internal successors, (212), 208 states have internal predecessors, (212), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:45,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 216 transitions. [2022-01-31 21:23:45,519 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 216 transitions. Word has length 207 [2022-01-31 21:23:45,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:23:45,520 INFO L470 AbstractCegarLoop]: Abstraction has 213 states and 216 transitions. [2022-01-31 21:23:45,520 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 126 states, 126 states have (on average 1.6111111111111112) internal successors, (203), 125 states have internal predecessors, (203), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:45,520 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 216 transitions. [2022-01-31 21:23:45,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2022-01-31 21:23:45,521 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:23:45,521 INFO L514 BasicCegarLoop]: trace histogram [76, 75, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:23:45,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2022-01-31 21:23:45,521 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:23:45,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:23:45,521 INFO L85 PathProgramCache]: Analyzing trace with hash 1802690225, now seen corresponding path program 59 times [2022-01-31 21:23:45,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:23:45,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [614643409] [2022-01-31 21:23:45,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:23:45,585 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 21:23:45,611 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:45,611 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:45,635 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:45,686 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 21:23:45,686 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:45,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:23:45,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:23:46,816 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:23:46,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:23:46,818 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:23:51,030 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:23:51,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [614643409] [2022-01-31 21:23:51,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [614643409] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:23:51,030 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:23:51,030 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [129] imperfect sequences [] total 129 [2022-01-31 21:23:51,030 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976083502] [2022-01-31 21:23:51,030 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:23:51,030 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2022-01-31 21:23:51,031 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:23:51,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2022-01-31 21:23:51,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1521, Invalid=15771, Unknown=0, NotChecked=0, Total=17292 [2022-01-31 21:23:51,032 INFO L87 Difference]: Start difference. First operand 213 states and 216 transitions. Second operand has 129 states, 129 states have (on average 1.6124031007751938) internal successors, (208), 128 states have internal predecessors, (208), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:59,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:23:59,589 INFO L93 Difference]: Finished difference Result 570 states and 580 transitions. [2022-01-31 21:23:59,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-01-31 21:23:59,589 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.6124031007751938) internal successors, (208), 128 states have internal predecessors, (208), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 212 [2022-01-31 21:23:59,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:23:59,590 INFO L225 Difference]: With dead ends: 570 [2022-01-31 21:23:59,590 INFO L226 Difference]: Without dead ends: 365 [2022-01-31 21:23:59,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7350 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=1910, Invalid=41562, Unknown=0, NotChecked=0, Total=43472 [2022-01-31 21:23:59,593 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 87 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 13044 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 415 SdHoareTripleChecker+Invalid, 13127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 13044 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:23:59,593 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 415 Invalid, 13127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 13044 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2022-01-31 21:23:59,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2022-01-31 21:23:59,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 365. [2022-01-31 21:23:59,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 365 states, 360 states have (on average 1.0138888888888888) internal successors, (365), 360 states have internal predecessors, (365), 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 21:23:59,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 369 transitions. [2022-01-31 21:23:59,643 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 369 transitions. Word has length 212 [2022-01-31 21:23:59,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:23:59,643 INFO L470 AbstractCegarLoop]: Abstraction has 365 states and 369 transitions. [2022-01-31 21:23:59,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.6124031007751938) internal successors, (208), 128 states have internal predecessors, (208), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:59,643 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 369 transitions. [2022-01-31 21:23:59,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2022-01-31 21:23:59,644 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:23:59,644 INFO L514 BasicCegarLoop]: trace histogram [77, 76, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:23:59,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2022-01-31 21:23:59,644 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:23:59,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:23:59,645 INFO L85 PathProgramCache]: Analyzing trace with hash -1066622026, now seen corresponding path program 60 times [2022-01-31 21:23:59,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:23:59,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251162254] [2022-01-31 21:23:59,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:23:59,695 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 21:23:59,715 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:59,715 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:59,733 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:59,783 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 21:23:59,783 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:59,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:23:59,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:24:00,911 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:24:00,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:24:00,914 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:24:03,873 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:24:03,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251162254] [2022-01-31 21:24:03,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1251162254] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:24:03,873 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:24:03,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [130] imperfect sequences [] total 130 [2022-01-31 21:24:03,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635821282] [2022-01-31 21:24:03,873 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:24:03,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 130 states [2022-01-31 21:24:03,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:24:03,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2022-01-31 21:24:03,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5441, Invalid=12115, Unknown=0, NotChecked=0, Total=17556 [2022-01-31 21:24:03,875 INFO L87 Difference]: Start difference. First operand 365 states and 369 transitions. Second operand has 130 states, 130 states have (on average 1.6153846153846154) internal successors, (210), 129 states have internal predecessors, (210), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:24:13,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:24:13,289 INFO L93 Difference]: Finished difference Result 573 states and 583 transitions. [2022-01-31 21:24:13,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2022-01-31 21:24:13,290 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 130 states have (on average 1.6153846153846154) internal successors, (210), 129 states have internal predecessors, (210), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 214 [2022-01-31 21:24:13,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:24:13,290 INFO L225 Difference]: With dead ends: 573 [2022-01-31 21:24:13,290 INFO L226 Difference]: Without dead ends: 368 [2022-01-31 21:24:13,293 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 258 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20219 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=16024, Invalid=51316, Unknown=0, NotChecked=0, Total=67340 [2022-01-31 21:24:13,293 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 326 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 12209 mSolverCounterSat, 371 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 326 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 12580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 371 IncrementalHoareTripleChecker+Valid, 12209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:24:13,294 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [326 Valid, 75 Invalid, 12580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [371 Valid, 12209 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-01-31 21:24:13,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2022-01-31 21:24:13,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 368. [2022-01-31 21:24:13,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 368 states, 363 states have (on average 1.0137741046831956) internal successors, (368), 363 states have internal predecessors, (368), 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 21:24:13,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 372 transitions. [2022-01-31 21:24:13,329 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 372 transitions. Word has length 214 [2022-01-31 21:24:13,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:24:13,329 INFO L470 AbstractCegarLoop]: Abstraction has 368 states and 372 transitions. [2022-01-31 21:24:13,329 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 130 states, 130 states have (on average 1.6153846153846154) internal successors, (210), 129 states have internal predecessors, (210), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:24:13,329 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 372 transitions. [2022-01-31 21:24:13,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2022-01-31 21:24:13,330 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:24:13,330 INFO L514 BasicCegarLoop]: trace histogram [78, 77, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:24:13,330 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2022-01-31 21:24:13,330 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:24:13,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:24:13,331 INFO L85 PathProgramCache]: Analyzing trace with hash 87848776, now seen corresponding path program 61 times [2022-01-31 21:24:13,331 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:24:13,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581212843] [2022-01-31 21:24:13,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:24:13,382 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 21:24:13,399 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:13,400 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:24:13,418 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:13,469 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 21:24:13,469 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:24:13,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:24:13,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:24:14,633 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:24:14,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:24:14,638 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:24:17,656 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:24:17,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1581212843] [2022-01-31 21:24:17,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1581212843] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:24:17,656 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:24:17,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [132] imperfect sequences [] total 132 [2022-01-31 21:24:17,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431622011] [2022-01-31 21:24:17,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:24:17,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2022-01-31 21:24:17,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:24:17,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2022-01-31 21:24:17,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5625, Invalid=12465, Unknown=0, NotChecked=0, Total=18090 [2022-01-31 21:24:17,659 INFO L87 Difference]: Start difference. First operand 368 states and 372 transitions. Second operand has 132 states, 132 states have (on average 1.6136363636363635) internal successors, (213), 131 states have internal predecessors, (213), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:24:27,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:24:27,375 INFO L93 Difference]: Finished difference Result 577 states and 587 transitions. [2022-01-31 21:24:27,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2022-01-31 21:24:27,376 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 1.6136363636363635) internal successors, (213), 131 states have internal predecessors, (213), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 217 [2022-01-31 21:24:27,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:24:27,377 INFO L225 Difference]: With dead ends: 577 [2022-01-31 21:24:27,377 INFO L226 Difference]: Without dead ends: 371 [2022-01-31 21:24:27,379 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20870 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=16571, Invalid=52861, Unknown=0, NotChecked=0, Total=69432 [2022-01-31 21:24:27,379 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 492 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 12541 mSolverCounterSat, 535 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 492 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 13076 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 535 IncrementalHoareTripleChecker+Valid, 12541 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:24:27,380 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [492 Valid, 35 Invalid, 13076 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [535 Valid, 12541 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-01-31 21:24:27,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2022-01-31 21:24:27,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 371. [2022-01-31 21:24:27,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 371 states, 366 states have (on average 1.0136612021857923) internal successors, (371), 366 states have internal predecessors, (371), 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 21:24:27,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 371 states to 371 states and 375 transitions. [2022-01-31 21:24:27,417 INFO L78 Accepts]: Start accepts. Automaton has 371 states and 375 transitions. Word has length 217 [2022-01-31 21:24:27,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:24:27,417 INFO L470 AbstractCegarLoop]: Abstraction has 371 states and 375 transitions. [2022-01-31 21:24:27,417 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 1.6136363636363635) internal successors, (213), 131 states have internal predecessors, (213), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:24:27,417 INFO L276 IsEmpty]: Start isEmpty. Operand 371 states and 375 transitions. [2022-01-31 21:24:27,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2022-01-31 21:24:27,418 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:24:27,418 INFO L514 BasicCegarLoop]: trace histogram [79, 78, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:24:27,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2022-01-31 21:24:27,419 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:24:27,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:24:27,419 INFO L85 PathProgramCache]: Analyzing trace with hash -826154400, now seen corresponding path program 62 times [2022-01-31 21:24:27,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:24:27,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [400788698] [2022-01-31 21:24:27,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:24:27,458 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 21:24:27,476 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:27,476 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:24:27,512 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:27,569 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 21:24:27,570 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:24:27,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:24:27,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:24:28,678 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:24:28,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:24:28,688 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:24:31,732 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:24:31,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [400788698] [2022-01-31 21:24:31,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [400788698] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:24:31,732 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:24:31,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [134] imperfect sequences [] total 134 [2022-01-31 21:24:31,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108634091] [2022-01-31 21:24:31,733 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:24:31,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2022-01-31 21:24:31,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:24:31,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2022-01-31 21:24:31,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5699, Invalid=12123, Unknown=0, NotChecked=0, Total=17822 [2022-01-31 21:24:31,734 INFO L87 Difference]: Start difference. First operand 371 states and 375 transitions. Second operand has 134 states, 134 states have (on average 1.6119402985074627) internal successors, (216), 133 states have internal predecessors, (216), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:24:41,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:24:41,789 INFO L93 Difference]: Finished difference Result 589 states and 607 transitions. [2022-01-31 21:24:41,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2022-01-31 21:24:41,789 INFO L78 Accepts]: Start accepts. Automaton has has 134 states, 134 states have (on average 1.6119402985074627) internal successors, (216), 133 states have internal predecessors, (216), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 220 [2022-01-31 21:24:41,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:24:41,790 INFO L225 Difference]: With dead ends: 589 [2022-01-31 21:24:41,790 INFO L226 Difference]: Without dead ends: 382 [2022-01-31 21:24:41,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20744 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=17091, Invalid=52869, Unknown=0, NotChecked=0, Total=69960 [2022-01-31 21:24:41,794 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 576 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 12832 mSolverCounterSat, 719 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 576 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 13551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 719 IncrementalHoareTripleChecker+Valid, 12832 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:24:41,794 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [576 Valid, 39 Invalid, 13551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [719 Valid, 12832 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2022-01-31 21:24:41,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2022-01-31 21:24:41,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 226. [2022-01-31 21:24:41,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 221 states have (on average 1.0180995475113122) internal successors, (225), 221 states have internal predecessors, (225), 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 21:24:41,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 229 transitions. [2022-01-31 21:24:41,820 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 229 transitions. Word has length 220 [2022-01-31 21:24:41,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:24:41,820 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 229 transitions. [2022-01-31 21:24:41,821 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 134 states, 134 states have (on average 1.6119402985074627) internal successors, (216), 133 states have internal predecessors, (216), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:24:41,821 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 229 transitions. [2022-01-31 21:24:41,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2022-01-31 21:24:41,821 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:24:41,821 INFO L514 BasicCegarLoop]: trace histogram [81, 80, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:24:41,821 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2022-01-31 21:24:41,822 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:24:41,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:24:41,822 INFO L85 PathProgramCache]: Analyzing trace with hash 1750930297, now seen corresponding path program 63 times [2022-01-31 21:24:41,822 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:24:41,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [64145537] [2022-01-31 21:24:41,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:24:41,862 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 21:24:41,880 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:41,880 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:24:41,899 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:41,940 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 21:24:41,941 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:24:41,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:24:41,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:24:43,118 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:24:43,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:24:43,120 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:24:46,323 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:24:46,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [64145537] [2022-01-31 21:24:46,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [64145537] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:24:46,324 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:24:46,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [137] imperfect sequences [] total 137 [2022-01-31 21:24:46,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956385352] [2022-01-31 21:24:46,324 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:24:46,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 137 states [2022-01-31 21:24:46,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:24:46,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2022-01-31 21:24:46,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5942, Invalid=12690, Unknown=0, NotChecked=0, Total=18632 [2022-01-31 21:24:46,326 INFO L87 Difference]: Start difference. First operand 226 states and 229 transitions. Second operand has 137 states, 137 states have (on average 1.6131386861313868) internal successors, (221), 136 states have internal predecessors, (221), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:24:56,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:24:56,780 INFO L93 Difference]: Finished difference Result 449 states and 460 transitions. [2022-01-31 21:24:56,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2022-01-31 21:24:56,780 INFO L78 Accepts]: Start accepts. Automaton has has 137 states, 137 states have (on average 1.6131386861313868) internal successors, (221), 136 states have internal predecessors, (221), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 225 [2022-01-31 21:24:56,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:24:56,781 INFO L225 Difference]: With dead ends: 449 [2022-01-31 21:24:56,781 INFO L226 Difference]: Without dead ends: 231 [2022-01-31 21:24:56,785 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 88 SyntacticMatches, 2 SemanticMatches, 269 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21691 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=17820, Invalid=55350, Unknown=0, NotChecked=0, Total=73170 [2022-01-31 21:24:56,785 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 594 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 13515 mSolverCounterSat, 735 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 594 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 14250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 735 IncrementalHoareTripleChecker+Valid, 13515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:24:56,786 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [594 Valid, 49 Invalid, 14250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [735 Valid, 13515 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2022-01-31 21:24:56,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2022-01-31 21:24:56,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 231. [2022-01-31 21:24:56,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 226 states have (on average 1.0176991150442478) internal successors, (230), 226 states have internal predecessors, (230), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:24:56,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 234 transitions. [2022-01-31 21:24:56,817 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 234 transitions. Word has length 225 [2022-01-31 21:24:56,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:24:56,817 INFO L470 AbstractCegarLoop]: Abstraction has 231 states and 234 transitions. [2022-01-31 21:24:56,817 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 137 states, 137 states have (on average 1.6131386861313868) internal successors, (221), 136 states have internal predecessors, (221), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:24:56,817 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 234 transitions. [2022-01-31 21:24:56,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2022-01-31 21:24:56,818 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:24:56,818 INFO L514 BasicCegarLoop]: trace histogram [83, 82, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:24:56,819 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2022-01-31 21:24:56,819 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:24:56,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:24:56,819 INFO L85 PathProgramCache]: Analyzing trace with hash 2060112468, now seen corresponding path program 64 times [2022-01-31 21:24:56,819 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:24:56,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1873824758] [2022-01-31 21:24:56,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:24:56,873 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 21:24:56,898 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:56,898 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:24:56,923 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:56,973 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 21:24:56,973 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:24:56,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:24:57,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:24:58,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:24:58,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:24:58,278 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:25:03,155 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:25:03,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1873824758] [2022-01-31 21:25:03,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1873824758] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:25:03,155 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:25:03,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [140] imperfect sequences [] total 140 [2022-01-31 21:25:03,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817644232] [2022-01-31 21:25:03,155 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:25:03,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 140 states [2022-01-31 21:25:03,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:25:03,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2022-01-31 21:25:03,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1752, Invalid=18554, Unknown=0, NotChecked=0, Total=20306 [2022-01-31 21:25:03,157 INFO L87 Difference]: Start difference. First operand 231 states and 234 transitions. Second operand has 140 states, 140 states have (on average 1.6142857142857143) internal successors, (226), 139 states have internal predecessors, (226), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:25:12,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:25:12,860 INFO L93 Difference]: Finished difference Result 620 states and 630 transitions. [2022-01-31 21:25:12,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2022-01-31 21:25:12,861 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 140 states have (on average 1.6142857142857143) internal successors, (226), 139 states have internal predecessors, (226), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 230 [2022-01-31 21:25:12,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:25:12,861 INFO L225 Difference]: With dead ends: 620 [2022-01-31 21:25:12,861 INFO L226 Difference]: Without dead ends: 397 [2022-01-31 21:25:12,863 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8647 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=2176, Invalid=49126, Unknown=0, NotChecked=0, Total=51302 [2022-01-31 21:25:12,864 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 94 mSDsluCounter, 427 mSDsCounter, 0 mSdLazyCounter, 15049 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 15139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 15049 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:25:12,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 440 Invalid, 15139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 15049 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2022-01-31 21:25:12,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2022-01-31 21:25:12,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 397. [2022-01-31 21:25:12,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 397 states, 392 states have (on average 1.0127551020408163) internal successors, (397), 392 states have internal predecessors, (397), 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 21:25:12,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 401 transitions. [2022-01-31 21:25:12,920 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 401 transitions. Word has length 230 [2022-01-31 21:25:12,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:25:12,920 INFO L470 AbstractCegarLoop]: Abstraction has 397 states and 401 transitions. [2022-01-31 21:25:12,920 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 140 states, 140 states have (on average 1.6142857142857143) internal successors, (226), 139 states have internal predecessors, (226), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:25:12,920 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 401 transitions. [2022-01-31 21:25:12,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 233 [2022-01-31 21:25:12,921 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:25:12,921 INFO L514 BasicCegarLoop]: trace histogram [84, 83, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:25:12,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2022-01-31 21:25:12,921 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:25:12,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:25:12,921 INFO L85 PathProgramCache]: Analyzing trace with hash 85016601, now seen corresponding path program 65 times [2022-01-31 21:25:12,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:25:12,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1064810068] [2022-01-31 21:25:12,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:25:12,973 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 21:25:12,991 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:12,991 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:25:13,016 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:13,067 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:13,067 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:25:13,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:25:13,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:25:14,362 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:25:14,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:25:14,364 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:25:17,812 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:25:17,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1064810068] [2022-01-31 21:25:17,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1064810068] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:25:17,812 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:25:17,812 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [141] imperfect sequences [] total 141 [2022-01-31 21:25:17,812 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418666732] [2022-01-31 21:25:17,812 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:25:17,813 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 141 states [2022-01-31 21:25:17,813 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:25:17,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2022-01-31 21:25:17,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6363, Invalid=14229, Unknown=0, NotChecked=0, Total=20592 [2022-01-31 21:25:17,815 INFO L87 Difference]: Start difference. First operand 397 states and 401 transitions. Second operand has 141 states, 141 states have (on average 1.6170212765957446) internal successors, (228), 140 states have internal predecessors, (228), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:25:28,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:25:28,958 INFO L93 Difference]: Finished difference Result 623 states and 633 transitions. [2022-01-31 21:25:28,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 141 states. [2022-01-31 21:25:28,958 INFO L78 Accepts]: Start accepts. Automaton has has 141 states, 141 states have (on average 1.6170212765957446) internal successors, (228), 140 states have internal predecessors, (228), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 232 [2022-01-31 21:25:28,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:25:28,959 INFO L225 Difference]: With dead ends: 623 [2022-01-31 21:25:28,959 INFO L226 Difference]: Without dead ends: 400 [2022-01-31 21:25:28,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 280 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23786 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=18767, Invalid=60475, Unknown=0, NotChecked=0, Total=79242 [2022-01-31 21:25:28,962 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 354 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 14581 mSolverCounterSat, 407 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 354 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 14988 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 407 IncrementalHoareTripleChecker+Valid, 14581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:25:28,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [354 Valid, 30 Invalid, 14988 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [407 Valid, 14581 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2022-01-31 21:25:28,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2022-01-31 21:25:29,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 400. [2022-01-31 21:25:29,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 400 states, 395 states have (on average 1.0126582278481013) internal successors, (400), 395 states have internal predecessors, (400), 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 21:25:29,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 404 transitions. [2022-01-31 21:25:29,002 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 404 transitions. Word has length 232 [2022-01-31 21:25:29,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:25:29,002 INFO L470 AbstractCegarLoop]: Abstraction has 400 states and 404 transitions. [2022-01-31 21:25:29,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 141 states, 141 states have (on average 1.6170212765957446) internal successors, (228), 140 states have internal predecessors, (228), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:25:29,002 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 404 transitions. [2022-01-31 21:25:29,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2022-01-31 21:25:29,003 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:25:29,003 INFO L514 BasicCegarLoop]: trace histogram [85, 84, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:25:29,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2022-01-31 21:25:29,003 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:25:29,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:25:29,004 INFO L85 PathProgramCache]: Analyzing trace with hash -652933499, now seen corresponding path program 66 times [2022-01-31 21:25:29,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:25:29,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [254771984] [2022-01-31 21:25:29,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:25:29,061 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 21:25:29,085 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:29,086 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:25:29,117 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:29,168 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 21:25:29,168 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:25:29,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:25:29,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:25:30,425 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:25:30,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:25:30,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:25:33,896 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:25:33,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [254771984] [2022-01-31 21:25:33,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [254771984] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:25:33,896 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:25:33,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [144] imperfect sequences [] total 144 [2022-01-31 21:25:33,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757588341] [2022-01-31 21:25:33,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:25:33,896 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 144 states [2022-01-31 21:25:33,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:25:33,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2022-01-31 21:25:33,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6585, Invalid=14007, Unknown=0, NotChecked=0, Total=20592 [2022-01-31 21:25:33,898 INFO L87 Difference]: Start difference. First operand 400 states and 404 transitions. Second operand has 144 states, 144 states have (on average 1.6041666666666667) internal successors, (231), 143 states have internal predecessors, (231), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:25:45,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:25:45,349 INFO L93 Difference]: Finished difference Result 634 states and 651 transitions. [2022-01-31 21:25:45,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2022-01-31 21:25:45,349 INFO L78 Accepts]: Start accepts. Automaton has has 144 states, 144 states have (on average 1.6041666666666667) internal successors, (231), 143 states have internal predecessors, (231), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 235 [2022-01-31 21:25:45,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:25:45,350 INFO L225 Difference]: With dead ends: 634 [2022-01-31 21:25:45,350 INFO L226 Difference]: Without dead ends: 410 [2022-01-31 21:25:45,353 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 283 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24049 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=19749, Invalid=61191, Unknown=0, NotChecked=0, Total=80940 [2022-01-31 21:25:45,353 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 623 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 14771 mSolverCounterSat, 599 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 623 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 15370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 599 IncrementalHoareTripleChecker+Valid, 14771 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:25:45,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [623 Valid, 39 Invalid, 15370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [599 Valid, 14771 Invalid, 0 Unknown, 0 Unchecked, 4.7s Time] [2022-01-31 21:25:45,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2022-01-31 21:25:45,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 242. [2022-01-31 21:25:45,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 237 states have (on average 1.0168776371308017) internal successors, (241), 237 states have internal predecessors, (241), 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 21:25:45,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 245 transitions. [2022-01-31 21:25:45,388 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 245 transitions. Word has length 235 [2022-01-31 21:25:45,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:25:45,388 INFO L470 AbstractCegarLoop]: Abstraction has 242 states and 245 transitions. [2022-01-31 21:25:45,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 144 states, 144 states have (on average 1.6041666666666667) internal successors, (231), 143 states have internal predecessors, (231), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:25:45,389 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 245 transitions. [2022-01-31 21:25:45,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2022-01-31 21:25:45,389 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:25:45,390 INFO L514 BasicCegarLoop]: trace histogram [87, 86, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:25:45,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2022-01-31 21:25:45,390 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:25:45,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:25:45,390 INFO L85 PathProgramCache]: Analyzing trace with hash 1564123163, now seen corresponding path program 67 times [2022-01-31 21:25:45,390 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:25:45,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941340183] [2022-01-31 21:25:45,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:25:45,437 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 21:25:45,469 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:45,469 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:25:45,493 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:45,530 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 21:25:45,530 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:25:45,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:25:45,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:25:46,972 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:25:46,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:25:46,974 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:25:52,346 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:25:52,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941340183] [2022-01-31 21:25:52,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [941340183] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:25:52,346 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:25:52,347 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [147] imperfect sequences [] total 147 [2022-01-31 21:25:52,347 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594843371] [2022-01-31 21:25:52,347 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:25:52,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 147 states [2022-01-31 21:25:52,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:25:52,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2022-01-31 21:25:52,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1932, Invalid=20418, Unknown=0, NotChecked=0, Total=22350 [2022-01-31 21:25:52,349 INFO L87 Difference]: Start difference. First operand 242 states and 245 transitions. Second operand has 147 states, 147 states have (on average 1.6122448979591837) internal successors, (237), 146 states have internal predecessors, (237), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:26:03,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:26:03,203 INFO L93 Difference]: Finished difference Result 650 states and 660 transitions. [2022-01-31 21:26:03,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-01-31 21:26:03,203 INFO L78 Accepts]: Start accepts. Automaton has has 147 states, 147 states have (on average 1.6122448979591837) internal successors, (237), 146 states have internal predecessors, (237), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 241 [2022-01-31 21:26:03,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:26:03,205 INFO L225 Difference]: With dead ends: 650 [2022-01-31 21:26:03,205 INFO L226 Difference]: Without dead ends: 416 [2022-01-31 21:26:03,207 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9501 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=2376, Invalid=54030, Unknown=0, NotChecked=0, Total=56406 [2022-01-31 21:26:03,207 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 98 mSDsluCounter, 467 mSDsCounter, 0 mSdLazyCounter, 17209 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 480 SdHoareTripleChecker+Invalid, 17303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 17209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:26:03,207 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 480 Invalid, 17303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 17209 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2022-01-31 21:26:03,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2022-01-31 21:26:03,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 416. [2022-01-31 21:26:03,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 416 states, 411 states have (on average 1.0121654501216546) internal successors, (416), 411 states have internal predecessors, (416), 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 21:26:03,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 420 transitions. [2022-01-31 21:26:03,264 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 420 transitions. Word has length 241 [2022-01-31 21:26:03,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:26:03,264 INFO L470 AbstractCegarLoop]: Abstraction has 416 states and 420 transitions. [2022-01-31 21:26:03,264 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 147 states, 147 states have (on average 1.6122448979591837) internal successors, (237), 146 states have internal predecessors, (237), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:26:03,264 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 420 transitions. [2022-01-31 21:26:03,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2022-01-31 21:26:03,265 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:26:03,265 INFO L514 BasicCegarLoop]: trace histogram [88, 87, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:26:03,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2022-01-31 21:26:03,265 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:26:03,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:26:03,265 INFO L85 PathProgramCache]: Analyzing trace with hash 1515345206, now seen corresponding path program 68 times [2022-01-31 21:26:03,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:26:03,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [54504554] [2022-01-31 21:26:03,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:26:03,317 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 21:26:03,335 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:03,335 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:26:03,352 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:03,401 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 21:26:03,401 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:26:03,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:26:03,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:26:04,866 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:26:04,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:26:04,869 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:26:10,292 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:26:10,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [54504554] [2022-01-31 21:26:10,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [54504554] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:26:10,292 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:26:10,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [148] imperfect sequences [] total 148 [2022-01-31 21:26:10,293 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409464397] [2022-01-31 21:26:10,293 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:26:10,293 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 148 states [2022-01-31 21:26:10,293 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:26:10,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2022-01-31 21:26:10,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1935, Invalid=20715, Unknown=0, NotChecked=0, Total=22650 [2022-01-31 21:26:10,294 INFO L87 Difference]: Start difference. First operand 416 states and 420 transitions. Second operand has 148 states, 148 states have (on average 1.614864864864865) internal successors, (239), 147 states have internal predecessors, (239), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:26:21,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:26:21,281 INFO L93 Difference]: Finished difference Result 652 states and 661 transitions. [2022-01-31 21:26:21,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2022-01-31 21:26:21,282 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 148 states have (on average 1.614864864864865) internal successors, (239), 147 states have internal predecessors, (239), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 243 [2022-01-31 21:26:21,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:26:21,283 INFO L225 Difference]: With dead ends: 652 [2022-01-31 21:26:21,283 INFO L226 Difference]: Without dead ends: 418 [2022-01-31 21:26:21,286 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 94 SyntacticMatches, 2 SemanticMatches, 238 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9651 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=2384, Invalid=54976, Unknown=0, NotChecked=0, Total=57360 [2022-01-31 21:26:21,286 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 99 mSDsluCounter, 467 mSDsCounter, 0 mSdLazyCounter, 17395 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 480 SdHoareTripleChecker+Invalid, 17489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 17395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:26:21,286 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 480 Invalid, 17489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 17395 Invalid, 0 Unknown, 0 Unchecked, 5.3s Time] [2022-01-31 21:26:21,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2022-01-31 21:26:21,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 418. [2022-01-31 21:26:21,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 418 states, 413 states have (on average 1.0121065375302662) internal successors, (418), 413 states have internal predecessors, (418), 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 21:26:21,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 418 states to 418 states and 422 transitions. [2022-01-31 21:26:21,352 INFO L78 Accepts]: Start accepts. Automaton has 418 states and 422 transitions. Word has length 243 [2022-01-31 21:26:21,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:26:21,352 INFO L470 AbstractCegarLoop]: Abstraction has 418 states and 422 transitions. [2022-01-31 21:26:21,352 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 148 states, 148 states have (on average 1.614864864864865) internal successors, (239), 147 states have internal predecessors, (239), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:26:21,352 INFO L276 IsEmpty]: Start isEmpty. Operand 418 states and 422 transitions. [2022-01-31 21:26:21,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2022-01-31 21:26:21,353 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:26:21,353 INFO L514 BasicCegarLoop]: trace histogram [89, 88, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:26:21,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2022-01-31 21:26:21,353 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:26:21,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:26:21,354 INFO L85 PathProgramCache]: Analyzing trace with hash 1884368785, now seen corresponding path program 69 times [2022-01-31 21:26:21,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:26:21,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [650156905] [2022-01-31 21:26:21,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:26:21,416 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 21:26:21,449 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:21,449 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:26:21,470 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:21,531 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 21:26:21,531 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:26:21,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:26:21,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:26:22,932 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:26:22,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:26:22,940 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 21:26:26,761 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:26:26,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [650156905] [2022-01-31 21:26:26,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [650156905] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:26:26,761 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:26:26,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [149] imperfect sequences [] total 149 [2022-01-31 21:26:26,761 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616374029] [2022-01-31 21:26:26,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:26:26,762 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 149 states [2022-01-31 21:26:26,762 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:26:26,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2022-01-31 21:26:26,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6964, Invalid=15088, Unknown=0, NotChecked=0, Total=22052 [2022-01-31 21:26:26,764 INFO L87 Difference]: Start difference. First operand 418 states and 422 transitions. Second operand has 149 states, 149 states have (on average 1.6174496644295302) internal successors, (241), 148 states have internal predecessors, (241), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:26:39,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:26:39,125 INFO L93 Difference]: Finished difference Result 661 states and 677 transitions. [2022-01-31 21:26:39,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2022-01-31 21:26:39,126 INFO L78 Accepts]: Start accepts. Automaton has has 149 states, 149 states have (on average 1.6174496644295302) internal successors, (241), 148 states have internal predecessors, (241), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 245 [2022-01-31 21:26:39,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:26:39,127 INFO L225 Difference]: With dead ends: 661 [2022-01-31 21:26:39,127 INFO L226 Difference]: Without dead ends: 427 [2022-01-31 21:26:39,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 293 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25689 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=20886, Invalid=65844, Unknown=0, NotChecked=0, Total=86730 [2022-01-31 21:26:39,130 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 466 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 16156 mSolverCounterSat, 345 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 466 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 16501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 345 IncrementalHoareTripleChecker+Valid, 16156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:26:39,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [466 Valid, 59 Invalid, 16501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [345 Valid, 16156 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-01-31 21:26:39,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2022-01-31 21:26:39,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 251. [2022-01-31 21:26:39,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 246 states have (on average 1.016260162601626) internal successors, (250), 246 states have internal predecessors, (250), 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 21:26:39,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 254 transitions. [2022-01-31 21:26:39,166 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 254 transitions. Word has length 245 [2022-01-31 21:26:39,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:26:39,166 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 254 transitions. [2022-01-31 21:26:39,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 149 states, 149 states have (on average 1.6174496644295302) internal successors, (241), 148 states have internal predecessors, (241), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:26:39,166 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 254 transitions. [2022-01-31 21:26:39,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2022-01-31 21:26:39,167 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:26:39,168 INFO L514 BasicCegarLoop]: trace histogram [91, 90, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:26:39,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2022-01-31 21:26:39,168 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:26:39,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:26:39,168 INFO L85 PathProgramCache]: Analyzing trace with hash -721833924, now seen corresponding path program 70 times [2022-01-31 21:26:39,168 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:26:39,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [102571478] [2022-01-31 21:26:39,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:26:39,206 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 21:26:39,224 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:39,224 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:26:39,248 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:39,298 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:39,298 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:26:39,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:26:39,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:26:40,654 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:26:40,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:26:40,656 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:26:44,594 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:26:44,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [102571478] [2022-01-31 21:26:44,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [102571478] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:26:44,594 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:26:44,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [152] imperfect sequences [] total 152 [2022-01-31 21:26:44,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135673502] [2022-01-31 21:26:44,594 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:26:44,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2022-01-31 21:26:44,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:26:44,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2022-01-31 21:26:44,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7232, Invalid=15720, Unknown=0, NotChecked=0, Total=22952 [2022-01-31 21:26:44,598 INFO L87 Difference]: Start difference. First operand 251 states and 254 transitions. Second operand has 152 states, 152 states have (on average 1.618421052631579) internal successors, (246), 151 states have internal predecessors, (246), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:26:57,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:26:57,533 INFO L93 Difference]: Finished difference Result 499 states and 510 transitions. [2022-01-31 21:26:57,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 152 states. [2022-01-31 21:26:57,533 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 152 states have (on average 1.618421052631579) internal successors, (246), 151 states have internal predecessors, (246), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 250 [2022-01-31 21:26:57,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:26:57,534 INFO L225 Difference]: With dead ends: 499 [2022-01-31 21:26:57,534 INFO L226 Difference]: Without dead ends: 256 [2022-01-31 21:26:57,537 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 299 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26741 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=21690, Invalid=68610, Unknown=0, NotChecked=0, Total=90300 [2022-01-31 21:26:57,538 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 476 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 16878 mSolverCounterSat, 538 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 476 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 17416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 538 IncrementalHoareTripleChecker+Valid, 16878 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:26:57,538 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [476 Valid, 24 Invalid, 17416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [538 Valid, 16878 Invalid, 0 Unknown, 0 Unchecked, 5.4s Time] [2022-01-31 21:26:57,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-01-31 21:26:57,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 256. [2022-01-31 21:26:57,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 251 states have (on average 1.0159362549800797) internal successors, (255), 251 states have internal predecessors, (255), 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 21:26:57,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 259 transitions. [2022-01-31 21:26:57,572 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 259 transitions. Word has length 250 [2022-01-31 21:26:57,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:26:57,572 INFO L470 AbstractCegarLoop]: Abstraction has 256 states and 259 transitions. [2022-01-31 21:26:57,572 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 152 states have (on average 1.618421052631579) internal successors, (246), 151 states have internal predecessors, (246), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:26:57,572 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 259 transitions. [2022-01-31 21:26:57,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2022-01-31 21:26:57,573 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:26:57,573 INFO L514 BasicCegarLoop]: trace histogram [93, 92, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:26:57,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2022-01-31 21:26:57,573 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:26:57,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:26:57,574 INFO L85 PathProgramCache]: Analyzing trace with hash -583741795, now seen corresponding path program 71 times [2022-01-31 21:26:57,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:26:57,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [617015143] [2022-01-31 21:26:57,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:26:57,625 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:57,643 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:57,643 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:26:57,660 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:57,712 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 21:26:57,713 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:26:57,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:26:57,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:26:59,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:26:59,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:26:59,199 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:27:05,220 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:27:05,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [617015143] [2022-01-31 21:27:05,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [617015143] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:27:05,221 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:27:05,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [155] imperfect sequences [] total 155 [2022-01-31 21:27:05,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723608671] [2022-01-31 21:27:05,221 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:27:05,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 155 states [2022-01-31 21:27:05,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:27:05,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2022-01-31 21:27:05,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2067, Invalid=22739, Unknown=0, NotChecked=0, Total=24806 [2022-01-31 21:27:05,223 INFO L87 Difference]: Start difference. First operand 256 states and 259 transitions. Second operand has 155 states, 155 states have (on average 1.6193548387096774) internal successors, (251), 154 states have internal predecessors, (251), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:27:17,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:27:17,731 INFO L93 Difference]: Finished difference Result 690 states and 700 transitions. [2022-01-31 21:27:17,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2022-01-31 21:27:17,731 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 155 states have (on average 1.6193548387096774) internal successors, (251), 154 states have internal predecessors, (251), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 255 [2022-01-31 21:27:17,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:27:17,732 INFO L225 Difference]: With dead ends: 690 [2022-01-31 21:27:17,732 INFO L226 Difference]: Without dead ends: 442 [2022-01-31 21:27:17,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10612 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=2541, Invalid=60711, Unknown=0, NotChecked=0, Total=63252 [2022-01-31 21:27:17,735 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 104 mSDsluCounter, 507 mSDsCounter, 0 mSdLazyCounter, 19897 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 520 SdHoareTripleChecker+Invalid, 19997 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 19897 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:27:17,735 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 520 Invalid, 19997 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 19897 Invalid, 0 Unknown, 0 Unchecked, 6.2s Time] [2022-01-31 21:27:17,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2022-01-31 21:27:17,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 442. [2022-01-31 21:27:17,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 442 states, 437 states have (on average 1.011441647597254) internal successors, (442), 437 states have internal predecessors, (442), 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 21:27:17,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 442 states to 442 states and 446 transitions. [2022-01-31 21:27:17,789 INFO L78 Accepts]: Start accepts. Automaton has 442 states and 446 transitions. Word has length 255 [2022-01-31 21:27:17,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:27:17,789 INFO L470 AbstractCegarLoop]: Abstraction has 442 states and 446 transitions. [2022-01-31 21:27:17,789 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 155 states, 155 states have (on average 1.6193548387096774) internal successors, (251), 154 states have internal predecessors, (251), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:27:17,790 INFO L276 IsEmpty]: Start isEmpty. Operand 442 states and 446 transitions. [2022-01-31 21:27:17,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2022-01-31 21:27:17,791 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:27:17,791 INFO L514 BasicCegarLoop]: trace histogram [94, 93, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:27:17,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2022-01-31 21:27:17,791 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:27:17,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:27:17,791 INFO L85 PathProgramCache]: Analyzing trace with hash 1112537208, now seen corresponding path program 72 times [2022-01-31 21:27:17,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:27:17,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [464211810] [2022-01-31 21:27:17,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:27:17,837 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:17,859 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:17,860 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:27:17,883 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:17,933 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 21:27:17,933 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:27:17,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:27:17,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:27:19,511 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:27:19,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:27:19,513 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:27:23,754 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:27:23,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [464211810] [2022-01-31 21:27:23,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [464211810] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:27:23,755 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:27:23,755 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [156] imperfect sequences [] total 156 [2022-01-31 21:27:23,755 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289818462] [2022-01-31 21:27:23,755 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:27:23,755 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 156 states [2022-01-31 21:27:23,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:27:23,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2022-01-31 21:27:23,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7790, Invalid=17332, Unknown=0, NotChecked=0, Total=25122 [2022-01-31 21:27:23,757 INFO L87 Difference]: Start difference. First operand 442 states and 446 transitions. Second operand has 156 states, 156 states have (on average 1.6217948717948718) internal successors, (253), 155 states have internal predecessors, (253), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:27:37,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:27:37,746 INFO L93 Difference]: Finished difference Result 693 states and 703 transitions. [2022-01-31 21:27:37,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 156 states. [2022-01-31 21:27:37,746 INFO L78 Accepts]: Start accepts. Automaton has has 156 states, 156 states have (on average 1.6217948717948718) internal successors, (253), 155 states have internal predecessors, (253), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 257 [2022-01-31 21:27:37,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:27:37,747 INFO L225 Difference]: With dead ends: 693 [2022-01-31 21:27:37,747 INFO L226 Difference]: Without dead ends: 445 [2022-01-31 21:27:37,751 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 310 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29072 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=22921, Invalid=74111, Unknown=0, NotChecked=0, Total=97032 [2022-01-31 21:27:37,751 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 492 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 18428 mSolverCounterSat, 547 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 492 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 18975 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 547 IncrementalHoareTripleChecker+Valid, 18428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:27:37,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [492 Valid, 34 Invalid, 18975 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [547 Valid, 18428 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2022-01-31 21:27:37,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 445 states. [2022-01-31 21:27:37,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 445 to 445. [2022-01-31 21:27:37,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 440 states have (on average 1.0113636363636365) internal successors, (445), 440 states have internal predecessors, (445), 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 21:27:37,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 449 transitions. [2022-01-31 21:27:37,814 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 449 transitions. Word has length 257 [2022-01-31 21:27:37,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:27:37,814 INFO L470 AbstractCegarLoop]: Abstraction has 445 states and 449 transitions. [2022-01-31 21:27:37,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 156 states, 156 states have (on average 1.6217948717948718) internal successors, (253), 155 states have internal predecessors, (253), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:27:37,814 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 449 transitions. [2022-01-31 21:27:37,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2022-01-31 21:27:37,815 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:27:37,815 INFO L514 BasicCegarLoop]: trace histogram [95, 94, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:27:37,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2022-01-31 21:27:37,816 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:27:37,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:27:37,816 INFO L85 PathProgramCache]: Analyzing trace with hash -572973520, now seen corresponding path program 73 times [2022-01-31 21:27:37,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:27:37,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1676841728] [2022-01-31 21:27:37,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:27:37,859 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 21:27:37,877 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:37,877 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:27:37,894 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:37,945 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 21:27:37,945 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:27:37,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:27:37,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:27:39,434 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:27:39,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:27:39,436 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:27:43,739 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:27:43,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1676841728] [2022-01-31 21:27:43,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1676841728] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:27:43,739 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:27:43,739 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [159] imperfect sequences [] total 159 [2022-01-31 21:27:43,739 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968845082] [2022-01-31 21:27:43,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:27:43,739 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 159 states [2022-01-31 21:27:43,739 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:27:43,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 159 interpolants. [2022-01-31 21:27:43,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7940, Invalid=17182, Unknown=0, NotChecked=0, Total=25122 [2022-01-31 21:27:43,741 INFO L87 Difference]: Start difference. First operand 445 states and 449 transitions. Second operand has 159 states, 159 states have (on average 1.610062893081761) internal successors, (256), 158 states have internal predecessors, (256), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:27:57,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:27:57,976 INFO L93 Difference]: Finished difference Result 704 states and 721 transitions. [2022-01-31 21:27:57,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 159 states. [2022-01-31 21:27:57,976 INFO L78 Accepts]: Start accepts. Automaton has has 159 states, 159 states have (on average 1.610062893081761) internal successors, (256), 158 states have internal predecessors, (256), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 260 [2022-01-31 21:27:57,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:27:57,977 INFO L225 Difference]: With dead ends: 704 [2022-01-31 21:27:57,977 INFO L226 Difference]: Without dead ends: 455 [2022-01-31 21:27:57,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 313 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29354 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=23814, Invalid=75096, Unknown=0, NotChecked=0, Total=98910 [2022-01-31 21:27:57,981 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 399 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 18350 mSolverCounterSat, 562 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 399 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 18912 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 562 IncrementalHoareTripleChecker+Valid, 18350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:27:57,981 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [399 Valid, 39 Invalid, 18912 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [562 Valid, 18350 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2022-01-31 21:27:57,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2022-01-31 21:27:58,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 267. [2022-01-31 21:27:58,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 262 states have (on average 1.015267175572519) internal successors, (266), 262 states have internal predecessors, (266), 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 21:27:58,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 270 transitions. [2022-01-31 21:27:58,009 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 270 transitions. Word has length 260 [2022-01-31 21:27:58,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:27:58,010 INFO L470 AbstractCegarLoop]: Abstraction has 267 states and 270 transitions. [2022-01-31 21:27:58,010 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 159 states, 159 states have (on average 1.610062893081761) internal successors, (256), 158 states have internal predecessors, (256), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:27:58,010 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 270 transitions. [2022-01-31 21:27:58,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2022-01-31 21:27:58,011 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:27:58,011 INFO L514 BasicCegarLoop]: trace histogram [97, 96, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:27:58,011 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2022-01-31 21:27:58,011 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:27:58,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:27:58,012 INFO L85 PathProgramCache]: Analyzing trace with hash -1688234790, now seen corresponding path program 74 times [2022-01-31 21:27:58,012 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:27:58,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [864315770] [2022-01-31 21:27:58,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:27:58,051 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 21:27:58,077 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:58,077 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:27:58,101 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:58,141 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 21:27:58,141 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:27:58,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:27:58,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:27:59,819 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:27:59,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:27:59,822 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:04,373 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:04,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [864315770] [2022-01-31 21:28:04,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [864315770] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:04,373 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:04,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [162] imperfect sequences [] total 162 [2022-01-31 21:28:04,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924599448] [2022-01-31 21:28:04,373 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:04,374 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 162 states [2022-01-31 21:28:04,374 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:04,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2022-01-31 21:28:04,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8359, Invalid=18701, Unknown=0, NotChecked=0, Total=27060 [2022-01-31 21:28:04,376 INFO L87 Difference]: Start difference. First operand 267 states and 270 transitions. Second operand has 162 states, 162 states have (on average 1.617283950617284) internal successors, (262), 161 states have internal predecessors, (262), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:19,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:19,171 INFO L93 Difference]: Finished difference Result 721 states and 732 transitions. [2022-01-31 21:28:19,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 162 states. [2022-01-31 21:28:19,171 INFO L78 Accepts]: Start accepts. Automaton has has 162 states, 162 states have (on average 1.617283950617284) internal successors, (262), 161 states have internal predecessors, (262), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 266 [2022-01-31 21:28:19,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:19,172 INFO L225 Difference]: With dead ends: 721 [2022-01-31 21:28:19,172 INFO L226 Difference]: Without dead ends: 462 [2022-01-31 21:28:19,176 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 103 SyntacticMatches, 2 SemanticMatches, 322 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31439 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=24710, Invalid=79942, Unknown=0, NotChecked=0, Total=104652 [2022-01-31 21:28:19,176 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 608 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 19085 mSolverCounterSat, 667 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 608 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 19752 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 667 IncrementalHoareTripleChecker+Valid, 19085 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:19,176 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [608 Valid, 25 Invalid, 19752 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [667 Valid, 19085 Invalid, 0 Unknown, 0 Unchecked, 6.1s Time] [2022-01-31 21:28:19,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2022-01-31 21:28:19,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 462. [2022-01-31 21:28:19,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 457 states have (on average 1.0109409190371992) internal successors, (462), 457 states have internal predecessors, (462), 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 21:28:19,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 466 transitions. [2022-01-31 21:28:19,242 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 466 transitions. Word has length 266 [2022-01-31 21:28:19,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:19,242 INFO L470 AbstractCegarLoop]: Abstraction has 462 states and 466 transitions. [2022-01-31 21:28:19,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 162 states, 162 states have (on average 1.617283950617284) internal successors, (262), 161 states have internal predecessors, (262), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:19,242 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 466 transitions. [2022-01-31 21:28:19,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2022-01-31 21:28:19,244 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:19,244 INFO L514 BasicCegarLoop]: trace histogram [98, 97, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:19,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2022-01-31 21:28:19,244 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:19,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:19,244 INFO L85 PathProgramCache]: Analyzing trace with hash 1835893540, now seen corresponding path program 75 times [2022-01-31 21:28:19,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:19,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1401540203] [2022-01-31 21:28:19,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:19,284 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 21:28:19,303 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:19,303 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:19,329 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:19,379 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 21:28:19,379 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:19,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:19,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:21,174 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:21,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:21,177 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:27,912 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:27,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1401540203] [2022-01-31 21:28:27,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1401540203] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:27,913 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:27,913 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [164] imperfect sequences [] total 164 [2022-01-31 21:28:27,913 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073149361] [2022-01-31 21:28:27,913 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:27,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 164 states [2022-01-31 21:28:27,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:27,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2022-01-31 21:28:27,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2328, Invalid=25394, Unknown=0, NotChecked=0, Total=27722 [2022-01-31 21:28:27,915 INFO L87 Difference]: Start difference. First operand 462 states and 466 transitions. Second operand has 164 states, 164 states have (on average 1.6158536585365855) internal successors, (265), 163 states have internal predecessors, (265), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:41,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:41,651 INFO L93 Difference]: Finished difference Result 724 states and 733 transitions. [2022-01-31 21:28:41,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-01-31 21:28:41,651 INFO L78 Accepts]: Start accepts. Automaton has has 164 states, 164 states have (on average 1.6158536585365855) internal successors, (265), 163 states have internal predecessors, (265), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 269 [2022-01-31 21:28:41,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:41,653 INFO L225 Difference]: With dead ends: 724 [2022-01-31 21:28:41,653 INFO L226 Difference]: Without dead ends: 464 [2022-01-31 21:28:41,656 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 104 SyntacticMatches, 2 SemanticMatches, 264 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11824 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=2827, Invalid=67663, Unknown=0, NotChecked=0, Total=70490 [2022-01-31 21:28:41,656 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 109 mSDsluCounter, 517 mSDsCounter, 0 mSdLazyCounter, 21321 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 530 SdHoareTripleChecker+Invalid, 21425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 21321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:41,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 530 Invalid, 21425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 21321 Invalid, 0 Unknown, 0 Unchecked, 6.7s Time] [2022-01-31 21:28:41,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2022-01-31 21:28:41,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 464. [2022-01-31 21:28:41,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 459 states have (on average 1.0108932461873639) internal successors, (464), 459 states have internal predecessors, (464), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:41,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 468 transitions. [2022-01-31 21:28:41,730 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 468 transitions. Word has length 269 [2022-01-31 21:28:41,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:41,730 INFO L470 AbstractCegarLoop]: Abstraction has 464 states and 468 transitions. [2022-01-31 21:28:41,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 164 states, 164 states have (on average 1.6158536585365855) internal successors, (265), 163 states have internal predecessors, (265), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:41,730 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 468 transitions. [2022-01-31 21:28:41,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2022-01-31 21:28:41,731 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:41,731 INFO L514 BasicCegarLoop]: trace histogram [99, 98, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:41,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2022-01-31 21:28:41,731 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:41,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:41,731 INFO L85 PathProgramCache]: Analyzing trace with hash 1241567679, now seen corresponding path program 76 times [2022-01-31 21:28:41,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:41,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [372866819] [2022-01-31 21:28:41,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:41,784 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 21:28:41,802 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:41,803 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:41,827 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:41,878 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 21:28:41,878 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:41,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:41,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:43,638 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:43,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:43,640 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:48,333 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:48,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [372866819] [2022-01-31 21:28:48,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [372866819] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:48,334 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:48,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [165] imperfect sequences [] total 165 [2022-01-31 21:28:48,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13269743] [2022-01-31 21:28:48,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:48,334 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 165 states [2022-01-31 21:28:48,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:48,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 165 interpolants. [2022-01-31 21:28:48,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8656, Invalid=19400, Unknown=0, NotChecked=0, Total=28056 [2022-01-31 21:28:48,336 INFO L87 Difference]: Start difference. First operand 464 states and 468 transitions. Second operand has 165 states, 165 states have (on average 1.6181818181818182) internal successors, (267), 164 states have internal predecessors, (267), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:03,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:03,942 INFO L93 Difference]: Finished difference Result 727 states and 737 transitions. [2022-01-31 21:29:03,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 165 states. [2022-01-31 21:29:03,942 INFO L78 Accepts]: Start accepts. Automaton has has 165 states, 165 states have (on average 1.6181818181818182) internal successors, (267), 164 states have internal predecessors, (267), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 271 [2022-01-31 21:29:03,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:03,943 INFO L225 Difference]: With dead ends: 727 [2022-01-31 21:29:03,943 INFO L226 Difference]: Without dead ends: 467 [2022-01-31 21:29:03,947 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 328 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32511 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=25591, Invalid=82979, Unknown=0, NotChecked=0, Total=108570 [2022-01-31 21:29:03,947 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 413 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 20283 mSolverCounterSat, 472 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 413 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 20755 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 472 IncrementalHoareTripleChecker+Valid, 20283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:03,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [413 Valid, 34 Invalid, 20755 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [472 Valid, 20283 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2022-01-31 21:29:03,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 467 states. [2022-01-31 21:29:04,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 467 to 467. [2022-01-31 21:29:04,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 462 states have (on average 1.0108225108225108) internal successors, (467), 462 states have internal predecessors, (467), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:04,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 471 transitions. [2022-01-31 21:29:04,013 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 471 transitions. Word has length 271 [2022-01-31 21:29:04,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:04,013 INFO L470 AbstractCegarLoop]: Abstraction has 467 states and 471 transitions. [2022-01-31 21:29:04,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 165 states, 165 states have (on average 1.6181818181818182) internal successors, (267), 164 states have internal predecessors, (267), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:04,013 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 471 transitions. [2022-01-31 21:29:04,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2022-01-31 21:29:04,014 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:04,014 INFO L514 BasicCegarLoop]: trace histogram [100, 99, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:04,014 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2022-01-31 21:29:04,014 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:04,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:04,015 INFO L85 PathProgramCache]: Analyzing trace with hash -1837100791, now seen corresponding path program 77 times [2022-01-31 21:29:04,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:04,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [753926094] [2022-01-31 21:29:04,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:04,053 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 21:29:04,072 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:04,072 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:04,103 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:04,140 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 21:29:04,141 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:04,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:04,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:05,796 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:05,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:05,798 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:10,571 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:10,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [753926094] [2022-01-31 21:29:10,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [753926094] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:10,571 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:10,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [167] imperfect sequences [] total 167 [2022-01-31 21:29:10,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821665197] [2022-01-31 21:29:10,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:10,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 167 states [2022-01-31 21:29:10,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:10,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 167 interpolants. [2022-01-31 21:29:10,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8747, Invalid=18975, Unknown=0, NotChecked=0, Total=27722 [2022-01-31 21:29:10,574 INFO L87 Difference]: Start difference. First operand 467 states and 471 transitions. Second operand has 167 states, 167 states have (on average 1.6167664670658684) internal successors, (270), 166 states have internal predecessors, (270), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:26,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:26,417 INFO L93 Difference]: Finished difference Result 739 states and 757 transitions. [2022-01-31 21:29:26,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 167 states. [2022-01-31 21:29:26,417 INFO L78 Accepts]: Start accepts. Automaton has has 167 states, 167 states have (on average 1.6167664670658684) internal successors, (270), 166 states have internal predecessors, (270), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 274 [2022-01-31 21:29:26,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:26,418 INFO L225 Difference]: With dead ends: 739 [2022-01-31 21:29:26,418 INFO L226 Difference]: Without dead ends: 478 [2022-01-31 21:29:26,422 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 107 SyntacticMatches, 2 SemanticMatches, 329 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32438 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=26235, Invalid=82995, Unknown=0, NotChecked=0, Total=109230 [2022-01-31 21:29:26,422 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 316 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 20381 mSolverCounterSat, 486 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 316 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 20867 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 486 IncrementalHoareTripleChecker+Valid, 20381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:26,422 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [316 Valid, 44 Invalid, 20867 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [486 Valid, 20381 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2022-01-31 21:29:26,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 478 states. [2022-01-31 21:29:26,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 478 to 280. [2022-01-31 21:29:26,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 280 states, 275 states have (on average 1.0145454545454546) internal successors, (279), 275 states have internal predecessors, (279), 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 21:29:26,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 283 transitions. [2022-01-31 21:29:26,453 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 283 transitions. Word has length 274 [2022-01-31 21:29:26,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:26,453 INFO L470 AbstractCegarLoop]: Abstraction has 280 states and 283 transitions. [2022-01-31 21:29:26,453 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 167 states, 167 states have (on average 1.6167664670658684) internal successors, (270), 166 states have internal predecessors, (270), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:26,453 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 283 transitions. [2022-01-31 21:29:26,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2022-01-31 21:29:26,454 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:26,454 INFO L514 BasicCegarLoop]: trace histogram [102, 101, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:26,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2022-01-31 21:29:26,454 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:26,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:26,455 INFO L85 PathProgramCache]: Analyzing trace with hash 138118512, now seen corresponding path program 78 times [2022-01-31 21:29:26,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:26,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1936060618] [2022-01-31 21:29:26,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:26,522 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 21:29:26,542 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:26,542 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:26,567 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 21:29:26,605 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 21:29:26,605 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:26,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:26,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:28,437 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:28,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:28,439 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:33,446 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:33,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1936060618] [2022-01-31 21:29:33,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1936060618] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:33,446 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:33,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [170] imperfect sequences [] total 170 [2022-01-31 21:29:33,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525437368] [2022-01-31 21:29:33,447 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:33,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 170 states [2022-01-31 21:29:33,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:33,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2022-01-31 21:29:33,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9186, Invalid=20570, Unknown=0, NotChecked=0, Total=29756 [2022-01-31 21:29:33,454 INFO L87 Difference]: Start difference. First operand 280 states and 283 transitions. Second operand has 170 states, 170 states have (on average 1.6176470588235294) internal successors, (275), 169 states have internal predecessors, (275), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:50,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:50,016 INFO L93 Difference]: Finished difference Result 757 states and 768 transitions. [2022-01-31 21:29:50,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 170 states. [2022-01-31 21:29:50,017 INFO L78 Accepts]: Start accepts. Automaton has has 170 states, 170 states have (on average 1.6176470588235294) internal successors, (275), 169 states have internal predecessors, (275), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 279 [2022-01-31 21:29:50,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:50,018 INFO L225 Difference]: With dead ends: 757 [2022-01-31 21:29:50,018 INFO L226 Difference]: Without dead ends: 485 [2022-01-31 21:29:50,021 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 338 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34629 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=27174, Invalid=88086, Unknown=0, NotChecked=0, Total=115260 [2022-01-31 21:29:50,021 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 637 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 21417 mSolverCounterSat, 698 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 637 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 22115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 698 IncrementalHoareTripleChecker+Valid, 21417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:50,022 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [637 Valid, 35 Invalid, 22115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [698 Valid, 21417 Invalid, 0 Unknown, 0 Unchecked, 6.9s Time] [2022-01-31 21:29:50,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485 states. [2022-01-31 21:29:50,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485 to 485. [2022-01-31 21:29:50,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 480 states have (on average 1.0104166666666667) internal successors, (485), 480 states have internal predecessors, (485), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:50,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 489 transitions. [2022-01-31 21:29:50,081 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 489 transitions. Word has length 279 [2022-01-31 21:29:50,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:50,081 INFO L470 AbstractCegarLoop]: Abstraction has 485 states and 489 transitions. [2022-01-31 21:29:50,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 170 states, 170 states have (on average 1.6176470588235294) internal successors, (275), 169 states have internal predecessors, (275), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:50,082 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 489 transitions. [2022-01-31 21:29:50,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2022-01-31 21:29:50,082 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:50,083 INFO L514 BasicCegarLoop]: trace histogram [103, 102, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:50,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2022-01-31 21:29:50,083 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:50,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:50,083 INFO L85 PathProgramCache]: Analyzing trace with hash 1674739320, now seen corresponding path program 79 times [2022-01-31 21:29:50,083 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:50,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1253464164] [2022-01-31 21:29:50,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:50,135 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 21:29:50,153 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 21:29:50,153 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:50,185 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:50,223 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 21:29:50,223 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:50,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:50,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:52,103 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:52,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:52,105 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:57,200 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:57,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1253464164] [2022-01-31 21:29:57,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1253464164] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:57,200 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:57,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [172] imperfect sequences [] total 172 [2022-01-31 21:29:57,200 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363280751] [2022-01-31 21:29:57,200 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:57,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 172 states [2022-01-31 21:29:57,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:57,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2022-01-31 21:29:57,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9425, Invalid=21025, Unknown=0, NotChecked=0, Total=30450 [2022-01-31 21:29:57,203 INFO L87 Difference]: Start difference. First operand 485 states and 489 transitions. Second operand has 172 states, 172 states have (on average 1.6162790697674418) internal successors, (278), 171 states have internal predecessors, (278), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)