/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/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loop-zilu/benchmark19_conjunctive.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 19:13:23,993 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 19:13:23,995 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 19:13:24,025 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 19:13:24,068 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 19:13:24,069 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 19:13:24,072 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 19:13:24,073 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 19:13:24,085 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 19:13:24,085 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 19:13:24,086 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 19:13:24,087 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 19:13:24,087 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 19:13:24,087 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 19:13:24,087 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 19:13:24,087 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 19:13:24,087 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 19:13:24,087 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 19:13:24,088 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 19:13:24,088 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 19:13:24,088 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 19:13:24,088 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 19:13:24,088 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 19:13:24,088 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 19:13:24,089 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 19:13:24,089 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 19:13:24,089 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 19:13:24,089 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 19:13:24,089 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 19:13:24,089 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 19:13:24,090 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 19:13:24,263 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 19:13:24,282 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 19:13:24,284 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 19:13:24,285 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 19:13:24,286 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 19:13:24,287 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-zilu/benchmark19_conjunctive.i [2022-03-20 19:13:24,330 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/14e939967/2e966f03e77648908a70da84a09e9e8c/FLAG24aca88b1 [2022-03-20 19:13:24,632 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 19:13:24,632 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-zilu/benchmark19_conjunctive.i [2022-03-20 19:13:24,638 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/14e939967/2e966f03e77648908a70da84a09e9e8c/FLAG24aca88b1 [2022-03-20 19:13:25,058 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/14e939967/2e966f03e77648908a70da84a09e9e8c [2022-03-20 19:13:25,060 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 19:13:25,061 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 19:13:25,067 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 19:13:25,067 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 19:13:25,069 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 19:13:25,070 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 07:13:25" (1/1) ... [2022-03-20 19:13:25,071 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@272cab60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:13:25, skipping insertion in model container [2022-03-20 19:13:25,071 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 07:13:25" (1/1) ... [2022-03-20 19:13:25,078 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 19:13:25,087 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 19:13:25,279 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-zilu/benchmark19_conjunctive.i[873,886] [2022-03-20 19:13:25,298 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 19:13:25,303 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 19:13:25,313 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-zilu/benchmark19_conjunctive.i[873,886] [2022-03-20 19:13:25,315 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 19:13:25,325 INFO L208 MainTranslator]: Completed translation [2022-03-20 19:13:25,325 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:13:25 WrapperNode [2022-03-20 19:13:25,325 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 19:13:25,326 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 19:13:25,326 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 19:13:25,326 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 19:13:25,334 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:13:25" (1/1) ... [2022-03-20 19:13:25,335 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:13:25" (1/1) ... [2022-03-20 19:13:25,339 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:13:25" (1/1) ... [2022-03-20 19:13:25,339 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:13:25" (1/1) ... [2022-03-20 19:13:25,342 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:13:25" (1/1) ... [2022-03-20 19:13:25,345 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:13:25" (1/1) ... [2022-03-20 19:13:25,346 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:13:25" (1/1) ... [2022-03-20 19:13:25,347 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 19:13:25,348 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 19:13:25,348 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 19:13:25,348 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 19:13:25,349 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:13:25" (1/1) ... [2022-03-20 19:13:25,354 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 19:13:25,369 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:13:25,379 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) [2022-03-20 19:13:25,380 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 [2022-03-20 19:13:25,408 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 19:13:25,409 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 19:13:25,409 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 19:13:25,409 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 19:13:25,409 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 19:13:25,409 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 19:13:25,409 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-03-20 19:13:25,409 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-03-20 19:13:25,409 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 19:13:25,410 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 19:13:25,410 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 19:13:25,410 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2022-03-20 19:13:25,410 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 19:13:25,410 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 19:13:25,410 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 19:13:25,410 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 19:13:25,410 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 19:13:25,410 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 19:13:25,411 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 19:13:25,411 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 19:13:25,467 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 19:13:25,469 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 19:13:25,567 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 19:13:25,571 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 19:13:25,571 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-20 19:13:25,573 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 07:13:25 BoogieIcfgContainer [2022-03-20 19:13:25,573 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 19:13:25,574 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 19:13:25,575 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 19:13:25,577 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 19:13:25,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 07:13:25" (1/3) ... [2022-03-20 19:13:25,578 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12e95d1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 07:13:25, skipping insertion in model container [2022-03-20 19:13:25,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:13:25" (2/3) ... [2022-03-20 19:13:25,579 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12e95d1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 07:13:25, skipping insertion in model container [2022-03-20 19:13:25,579 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 07:13:25" (3/3) ... [2022-03-20 19:13:25,580 INFO L111 eAbstractionObserver]: Analyzing ICFG benchmark19_conjunctive.i [2022-03-20 19:13:25,584 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 19:13:25,584 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 19:13:25,617 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 19:13:25,623 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, 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 [2022-03-20 19:13:25,623 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 19:13:25,634 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 19:13:25,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-20 19:13:25,640 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:25,640 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:25,641 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:25,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:25,646 INFO L85 PathProgramCache]: Analyzing trace with hash -304977768, now seen corresponding path program 1 times [2022-03-20 19:13:25,653 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:25,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1692685403] [2022-03-20 19:13:25,665 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:13:25,665 INFO L85 PathProgramCache]: Analyzing trace with hash -304977768, now seen corresponding path program 2 times [2022-03-20 19:13:25,667 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:25,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966257211] [2022-03-20 19:13:25,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:25,668 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:25,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:25,816 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:25,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:25,826 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:25,826 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:25,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966257211] [2022-03-20 19:13:25,827 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966257211] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:25,827 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:25,827 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:25,829 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:25,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1692685403] [2022-03-20 19:13:25,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1692685403] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:25,830 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:25,830 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:25,830 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723878154] [2022-03-20 19:13:25,831 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:25,834 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 19:13:25,834 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:25,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 19:13:25,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 19:13:25,872 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 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) [2022-03-20 19:13:25,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:25,934 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2022-03-20 19:13:25,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 19:13:25,936 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 [2022-03-20 19:13:25,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:25,941 INFO L225 Difference]: With dead ends: 33 [2022-03-20 19:13:25,941 INFO L226 Difference]: Without dead ends: 14 [2022-03-20 19:13:25,943 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-20 19:13:25,946 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 12 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:25,947 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 28 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:25,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-03-20 19:13:25,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-03-20 19:13:25,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:25,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2022-03-20 19:13:25,986 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2022-03-20 19:13:25,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:25,986 INFO L478 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2022-03-20 19:13:25,986 INFO L479 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) [2022-03-20 19:13:25,987 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2022-03-20 19:13:26,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-20 19:13:26,007 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:26,007 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:26,007 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 19:13:26,007 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:26,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:26,008 INFO L85 PathProgramCache]: Analyzing trace with hash -828987386, now seen corresponding path program 1 times [2022-03-20 19:13:26,009 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:26,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [577344264] [2022-03-20 19:13:26,269 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:26,271 INFO L85 PathProgramCache]: Analyzing trace with hash 28963623, now seen corresponding path program 1 times [2022-03-20 19:13:26,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:26,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [448627102] [2022-03-20 19:13:26,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:26,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:26,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:26,364 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:26,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:26,391 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:26,391 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:26,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [448627102] [2022-03-20 19:13:26,392 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [448627102] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:26,392 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:26,392 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:26,560 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:26,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [577344264] [2022-03-20 19:13:26,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [577344264] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:26,561 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:26,562 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 19:13:26,563 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620628978] [2022-03-20 19:13:26,563 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:26,564 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 19:13:26,564 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:26,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 19:13:26,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2022-03-20 19:13:26,566 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:26,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:26,701 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2022-03-20 19:13:26,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 19:13:26,701 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-03-20 19:13:26,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:26,702 INFO L225 Difference]: With dead ends: 20 [2022-03-20 19:13:26,703 INFO L226 Difference]: Without dead ends: 15 [2022-03-20 19:13:26,705 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2022-03-20 19:13:26,708 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 13 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:26,713 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 31 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:26,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-03-20 19:13:26,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-03-20 19:13:26,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:26,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2022-03-20 19:13:26,722 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2022-03-20 19:13:26,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:26,722 INFO L478 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2022-03-20 19:13:26,722 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:26,723 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2022-03-20 19:13:26,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-20 19:13:26,723 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:26,723 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:26,723 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 19:13:26,723 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:26,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:26,724 INFO L85 PathProgramCache]: Analyzing trace with hash 106583640, now seen corresponding path program 2 times [2022-03-20 19:13:26,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:26,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [466186847] [2022-03-20 19:13:26,880 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:26,881 INFO L85 PathProgramCache]: Analyzing trace with hash 88068967, now seen corresponding path program 1 times [2022-03-20 19:13:26,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:26,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826820724] [2022-03-20 19:13:26,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:26,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:26,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:26,937 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:26,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:26,946 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:26,946 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:26,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [826820724] [2022-03-20 19:13:26,946 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [826820724] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:26,946 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:26,947 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:27,080 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:27,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [466186847] [2022-03-20 19:13:27,081 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [466186847] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:27,081 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:27,081 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 19:13:27,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745604059] [2022-03-20 19:13:27,081 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:27,082 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 19:13:27,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:27,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 19:13:27,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-03-20 19:13:27,083 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 10 states, 8 states have (on average 1.25) internal successors, (10), 8 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) [2022-03-20 19:13:27,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:27,223 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2022-03-20 19:13:27,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 19:13:27,224 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 1.25) internal successors, (10), 8 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 [2022-03-20 19:13:27,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:27,224 INFO L225 Difference]: With dead ends: 21 [2022-03-20 19:13:27,225 INFO L226 Difference]: Without dead ends: 16 [2022-03-20 19:13:27,225 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=188, Unknown=0, NotChecked=0, Total=272 [2022-03-20 19:13:27,226 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:27,227 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 36 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:27,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-03-20 19:13:27,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-03-20 19:13:27,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 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) [2022-03-20 19:13:27,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2022-03-20 19:13:27,230 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2022-03-20 19:13:27,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:27,231 INFO L478 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2022-03-20 19:13:27,231 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 1.25) internal successors, (10), 8 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) [2022-03-20 19:13:27,231 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2022-03-20 19:13:27,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 19:13:27,232 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:27,232 INFO L499 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:27,232 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 19:13:27,232 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:27,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:27,233 INFO L85 PathProgramCache]: Analyzing trace with hash -955485626, now seen corresponding path program 3 times [2022-03-20 19:13:27,233 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:27,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [325254333] [2022-03-20 19:13:27,567 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:27,567 INFO L85 PathProgramCache]: Analyzing trace with hash 147174311, now seen corresponding path program 1 times [2022-03-20 19:13:27,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:27,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182149203] [2022-03-20 19:13:27,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:27,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:27,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:27,610 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:27,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:27,615 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:27,615 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:27,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182149203] [2022-03-20 19:13:27,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182149203] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:27,615 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:27,615 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:27,738 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:27,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [325254333] [2022-03-20 19:13:27,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [325254333] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:27,739 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:27,739 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 19:13:27,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533103781] [2022-03-20 19:13:27,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:27,739 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 19:13:27,739 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:27,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 19:13:27,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2022-03-20 19:13:27,740 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 11 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:27,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:27,880 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2022-03-20 19:13:27,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 19:13:27,881 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-20 19:13:27,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:27,881 INFO L225 Difference]: With dead ends: 22 [2022-03-20 19:13:27,882 INFO L226 Difference]: Without dead ends: 17 [2022-03-20 19:13:27,882 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=99, Invalid=243, Unknown=0, NotChecked=0, Total=342 [2022-03-20 19:13:27,883 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:27,883 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 36 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:27,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-20 19:13:27,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-20 19:13:27,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:27,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2022-03-20 19:13:27,887 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2022-03-20 19:13:27,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:27,887 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2022-03-20 19:13:27,887 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:27,887 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2022-03-20 19:13:27,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-20 19:13:27,888 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:27,888 INFO L499 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:27,888 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-20 19:13:27,888 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:27,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:27,889 INFO L85 PathProgramCache]: Analyzing trace with hash 480105496, now seen corresponding path program 4 times [2022-03-20 19:13:27,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:27,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [689863116] [2022-03-20 19:13:28,061 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:28,061 INFO L85 PathProgramCache]: Analyzing trace with hash 206279655, now seen corresponding path program 1 times [2022-03-20 19:13:28,061 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:28,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404166912] [2022-03-20 19:13:28,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:28,062 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:28,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:28,093 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:28,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:28,098 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:28,098 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:28,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404166912] [2022-03-20 19:13:28,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404166912] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:28,098 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:28,098 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:28,227 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:28,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [689863116] [2022-03-20 19:13:28,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [689863116] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:28,228 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:28,228 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 19:13:28,228 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132183179] [2022-03-20 19:13:28,228 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:28,228 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 19:13:28,229 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:28,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 19:13:28,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2022-03-20 19:13:28,229 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 12 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:28,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:28,394 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2022-03-20 19:13:28,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 19:13:28,395 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-03-20 19:13:28,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:28,395 INFO L225 Difference]: With dead ends: 23 [2022-03-20 19:13:28,395 INFO L226 Difference]: Without dead ends: 18 [2022-03-20 19:13:28,396 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=117, Invalid=303, Unknown=0, NotChecked=0, Total=420 [2022-03-20 19:13:28,396 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:28,397 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 31 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:28,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-03-20 19:13:28,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-03-20 19:13:28,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 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) [2022-03-20 19:13:28,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2022-03-20 19:13:28,400 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2022-03-20 19:13:28,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:28,401 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2022-03-20 19:13:28,401 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:28,401 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2022-03-20 19:13:28,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 19:13:28,401 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:28,401 INFO L499 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:28,401 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-03-20 19:13:28,401 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:28,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:28,402 INFO L85 PathProgramCache]: Analyzing trace with hash 2033757318, now seen corresponding path program 5 times [2022-03-20 19:13:28,402 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:28,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2017873207] [2022-03-20 19:13:28,543 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:28,544 INFO L85 PathProgramCache]: Analyzing trace with hash 265384999, now seen corresponding path program 1 times [2022-03-20 19:13:28,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:28,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504994435] [2022-03-20 19:13:28,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:28,544 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:28,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:28,575 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:28,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:28,580 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:28,580 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:28,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504994435] [2022-03-20 19:13:28,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504994435] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:28,581 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:28,581 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:28,738 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:28,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2017873207] [2022-03-20 19:13:28,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2017873207] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:28,739 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:28,739 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 19:13:28,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074976267] [2022-03-20 19:13:28,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:28,739 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 19:13:28,739 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:28,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 19:13:28,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2022-03-20 19:13:28,740 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 13 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:28,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:28,921 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2022-03-20 19:13:28,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 19:13:28,922 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-20 19:13:28,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:28,922 INFO L225 Difference]: With dead ends: 24 [2022-03-20 19:13:28,922 INFO L226 Difference]: Without dead ends: 19 [2022-03-20 19:13:28,923 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=138, Invalid=368, Unknown=0, NotChecked=0, Total=506 [2022-03-20 19:13:28,924 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:28,924 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 26 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:28,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-20 19:13:28,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-03-20 19:13:28,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:28,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2022-03-20 19:13:28,928 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2022-03-20 19:13:28,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:28,928 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2022-03-20 19:13:28,929 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:28,929 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2022-03-20 19:13:28,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 19:13:28,929 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:28,929 INFO L499 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:28,929 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-03-20 19:13:28,929 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:28,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:28,930 INFO L85 PathProgramCache]: Analyzing trace with hash -1342643752, now seen corresponding path program 6 times [2022-03-20 19:13:28,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:28,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [727804548] [2022-03-20 19:13:29,094 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:29,095 INFO L85 PathProgramCache]: Analyzing trace with hash 324490343, now seen corresponding path program 1 times [2022-03-20 19:13:29,095 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:29,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746172078] [2022-03-20 19:13:29,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:29,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:29,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:29,136 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:29,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:29,146 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:29,146 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:29,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746172078] [2022-03-20 19:13:29,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746172078] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:29,146 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:29,147 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:29,323 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:29,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [727804548] [2022-03-20 19:13:29,323 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [727804548] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:29,323 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:29,324 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 19:13:29,324 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994127739] [2022-03-20 19:13:29,324 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:29,324 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 19:13:29,324 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:29,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 19:13:29,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2022-03-20 19:13:29,326 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand has 14 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:29,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:29,513 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2022-03-20 19:13:29,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 19:13:29,514 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2022-03-20 19:13:29,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:29,514 INFO L225 Difference]: With dead ends: 25 [2022-03-20 19:13:29,514 INFO L226 Difference]: Without dead ends: 20 [2022-03-20 19:13:29,515 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=162, Invalid=438, Unknown=0, NotChecked=0, Total=600 [2022-03-20 19:13:29,515 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:29,515 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 26 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:13:29,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-03-20 19:13:29,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-03-20 19:13:29,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 15 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:29,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2022-03-20 19:13:29,519 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2022-03-20 19:13:29,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:29,520 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2022-03-20 19:13:29,520 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:29,520 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2022-03-20 19:13:29,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-20 19:13:29,520 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:29,520 INFO L499 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:29,521 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-03-20 19:13:29,521 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:29,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:29,521 INFO L85 PathProgramCache]: Analyzing trace with hash 1363105478, now seen corresponding path program 7 times [2022-03-20 19:13:29,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:29,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1454211179] [2022-03-20 19:13:29,688 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:29,689 INFO L85 PathProgramCache]: Analyzing trace with hash 383595687, now seen corresponding path program 1 times [2022-03-20 19:13:29,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:29,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761833422] [2022-03-20 19:13:29,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:29,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:29,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:29,733 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:29,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:29,744 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:29,744 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:29,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761833422] [2022-03-20 19:13:29,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761833422] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:29,745 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:29,745 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:29,928 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:29,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1454211179] [2022-03-20 19:13:29,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1454211179] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:29,928 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:29,928 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 19:13:29,928 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814508839] [2022-03-20 19:13:29,929 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:29,929 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 19:13:29,929 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:29,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 19:13:29,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=145, Unknown=0, NotChecked=0, Total=210 [2022-03-20 19:13:29,930 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 15 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 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) [2022-03-20 19:13:30,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:30,137 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2022-03-20 19:13:30,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 19:13:30,137 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 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 [2022-03-20 19:13:30,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:30,138 INFO L225 Difference]: With dead ends: 26 [2022-03-20 19:13:30,138 INFO L226 Difference]: Without dead ends: 21 [2022-03-20 19:13:30,138 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=189, Invalid=513, Unknown=0, NotChecked=0, Total=702 [2022-03-20 19:13:30,139 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:30,139 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 16 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:30,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-20 19:13:30,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-03-20 19:13:30,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:30,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2022-03-20 19:13:30,143 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2022-03-20 19:13:30,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:30,144 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2022-03-20 19:13:30,144 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 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) [2022-03-20 19:13:30,144 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2022-03-20 19:13:30,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 19:13:30,144 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:30,144 INFO L499 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:30,144 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-03-20 19:13:30,145 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:30,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:30,145 INFO L85 PathProgramCache]: Analyzing trace with hash -658014312, now seen corresponding path program 8 times [2022-03-20 19:13:30,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:30,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1006882861] [2022-03-20 19:13:30,308 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:30,308 INFO L85 PathProgramCache]: Analyzing trace with hash 442701031, now seen corresponding path program 1 times [2022-03-20 19:13:30,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:30,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1363062722] [2022-03-20 19:13:30,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:30,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:30,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:30,346 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:30,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:30,351 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:30,352 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:30,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1363062722] [2022-03-20 19:13:30,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1363062722] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:30,352 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:30,352 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:30,582 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:30,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1006882861] [2022-03-20 19:13:30,582 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1006882861] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:30,582 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:30,582 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 19:13:30,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590284554] [2022-03-20 19:13:30,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:30,583 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 19:13:30,583 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:30,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 19:13:30,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2022-03-20 19:13:30,584 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 16 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:30,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:30,818 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2022-03-20 19:13:30,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 19:13:30,819 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-03-20 19:13:30,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:30,819 INFO L225 Difference]: With dead ends: 27 [2022-03-20 19:13:30,819 INFO L226 Difference]: Without dead ends: 22 [2022-03-20 19:13:30,820 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=219, Invalid=593, Unknown=0, NotChecked=0, Total=812 [2022-03-20 19:13:30,821 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:30,821 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 36 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:30,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-03-20 19:13:30,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-03-20 19:13:30,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 17 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:30,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2022-03-20 19:13:30,824 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2022-03-20 19:13:30,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:30,825 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2022-03-20 19:13:30,825 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:30,825 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2022-03-20 19:13:30,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 19:13:30,825 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:30,825 INFO L499 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:30,826 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-03-20 19:13:30,826 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:30,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:30,826 INFO L85 PathProgramCache]: Analyzing trace with hash 1111781638, now seen corresponding path program 9 times [2022-03-20 19:13:30,826 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:30,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [659946348] [2022-03-20 19:13:30,984 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:30,984 INFO L85 PathProgramCache]: Analyzing trace with hash 501806375, now seen corresponding path program 1 times [2022-03-20 19:13:30,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:30,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782199502] [2022-03-20 19:13:30,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:30,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:30,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:31,014 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:31,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:31,027 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:31,027 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:31,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782199502] [2022-03-20 19:13:31,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782199502] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:31,028 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:31,028 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:31,246 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:31,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [659946348] [2022-03-20 19:13:31,246 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [659946348] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:31,246 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:31,246 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 19:13:31,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932132438] [2022-03-20 19:13:31,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:31,246 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 19:13:31,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:31,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 19:13:31,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=186, Unknown=0, NotChecked=0, Total=272 [2022-03-20 19:13:31,247 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand has 17 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 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) [2022-03-20 19:13:31,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:31,483 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2022-03-20 19:13:31,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 19:13:31,484 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 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 [2022-03-20 19:13:31,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:31,484 INFO L225 Difference]: With dead ends: 28 [2022-03-20 19:13:31,484 INFO L226 Difference]: Without dead ends: 23 [2022-03-20 19:13:31,485 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=252, Invalid=678, Unknown=0, NotChecked=0, Total=930 [2022-03-20 19:13:31,485 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:31,486 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 36 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:31,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-20 19:13:31,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-20 19:13:31,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 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) [2022-03-20 19:13:31,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2022-03-20 19:13:31,489 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2022-03-20 19:13:31,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:31,489 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2022-03-20 19:13:31,489 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 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) [2022-03-20 19:13:31,489 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2022-03-20 19:13:31,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 19:13:31,490 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:31,490 INFO L499 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:31,490 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-03-20 19:13:31,490 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:31,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:31,490 INFO L85 PathProgramCache]: Analyzing trace with hash 140881240, now seen corresponding path program 10 times [2022-03-20 19:13:31,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:31,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1322878036] [2022-03-20 19:13:31,641 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:31,641 INFO L85 PathProgramCache]: Analyzing trace with hash 560911719, now seen corresponding path program 1 times [2022-03-20 19:13:31,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:31,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092710654] [2022-03-20 19:13:31,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:31,642 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:31,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:31,679 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:31,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:31,682 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:31,682 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:31,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092710654] [2022-03-20 19:13:31,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1092710654] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:31,683 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:31,683 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:31,919 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:31,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1322878036] [2022-03-20 19:13:31,920 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1322878036] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:31,920 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:31,920 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 19:13:31,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840482880] [2022-03-20 19:13:31,920 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:31,921 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 19:13:31,921 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:31,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 19:13:31,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=208, Unknown=0, NotChecked=0, Total=306 [2022-03-20 19:13:31,922 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand has 18 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:32,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:32,206 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2022-03-20 19:13:32,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 19:13:32,207 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 19:13:32,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:32,207 INFO L225 Difference]: With dead ends: 29 [2022-03-20 19:13:32,207 INFO L226 Difference]: Without dead ends: 24 [2022-03-20 19:13:32,208 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=288, Invalid=768, Unknown=0, NotChecked=0, Total=1056 [2022-03-20 19:13:32,208 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:32,209 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 36 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:32,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-20 19:13:32,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-03-20 19:13:32,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 19 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:32,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2022-03-20 19:13:32,212 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2022-03-20 19:13:32,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:32,213 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2022-03-20 19:13:32,213 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:32,213 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2022-03-20 19:13:32,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 19:13:32,213 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:32,213 INFO L499 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:32,214 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-03-20 19:13:32,214 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:32,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:32,214 INFO L85 PathProgramCache]: Analyzing trace with hash 107739974, now seen corresponding path program 11 times [2022-03-20 19:13:32,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:32,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1520217730] [2022-03-20 19:13:32,328 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:32,328 INFO L85 PathProgramCache]: Analyzing trace with hash 620017063, now seen corresponding path program 1 times [2022-03-20 19:13:32,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:32,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827471696] [2022-03-20 19:13:32,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:32,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:32,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:32,368 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:32,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:32,372 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:32,372 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:32,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827471696] [2022-03-20 19:13:32,372 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [827471696] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:32,372 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:32,372 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:32,627 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:32,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1520217730] [2022-03-20 19:13:32,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1520217730] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:32,627 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:32,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 19:13:32,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677097978] [2022-03-20 19:13:32,628 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:32,628 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 19:13:32,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:32,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 19:13:32,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=231, Unknown=0, NotChecked=0, Total=342 [2022-03-20 19:13:32,629 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand has 19 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:32,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:32,907 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2022-03-20 19:13:32,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 19:13:32,907 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-20 19:13:32,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:32,907 INFO L225 Difference]: With dead ends: 30 [2022-03-20 19:13:32,907 INFO L226 Difference]: Without dead ends: 25 [2022-03-20 19:13:32,908 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=327, Invalid=863, Unknown=0, NotChecked=0, Total=1190 [2022-03-20 19:13:32,909 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:32,909 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 36 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:32,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-20 19:13:32,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-20 19:13:32,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:32,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2022-03-20 19:13:32,912 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2022-03-20 19:13:32,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:32,913 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2022-03-20 19:13:32,913 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:32,913 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2022-03-20 19:13:32,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-20 19:13:32,913 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:32,913 INFO L499 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:32,913 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-03-20 19:13:32,914 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:32,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:32,914 INFO L85 PathProgramCache]: Analyzing trace with hash -919639272, now seen corresponding path program 12 times [2022-03-20 19:13:32,914 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:32,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1501161955] [2022-03-20 19:13:33,047 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:33,047 INFO L85 PathProgramCache]: Analyzing trace with hash 679122407, now seen corresponding path program 1 times [2022-03-20 19:13:33,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:33,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168730770] [2022-03-20 19:13:33,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:33,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:33,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:33,076 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:33,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:33,079 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:33,079 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:33,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168730770] [2022-03-20 19:13:33,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [168730770] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:33,080 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:33,080 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:33,368 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:33,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1501161955] [2022-03-20 19:13:33,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1501161955] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:33,368 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:33,368 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 19:13:33,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274721989] [2022-03-20 19:13:33,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:33,368 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 19:13:33,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:33,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 19:13:33,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2022-03-20 19:13:33,369 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand has 20 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 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) [2022-03-20 19:13:33,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:33,703 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2022-03-20 19:13:33,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 19:13:33,704 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 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 [2022-03-20 19:13:33,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:33,704 INFO L225 Difference]: With dead ends: 31 [2022-03-20 19:13:33,704 INFO L226 Difference]: Without dead ends: 26 [2022-03-20 19:13:33,705 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=369, Invalid=963, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 19:13:33,706 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:33,706 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 31 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:13:33,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-20 19:13:33,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-03-20 19:13:33,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 21 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:33,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2022-03-20 19:13:33,710 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2022-03-20 19:13:33,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:33,710 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2022-03-20 19:13:33,710 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 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) [2022-03-20 19:13:33,710 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2022-03-20 19:13:33,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-20 19:13:33,711 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:33,711 INFO L499 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:33,711 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-03-20 19:13:33,711 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:33,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:33,711 INFO L85 PathProgramCache]: Analyzing trace with hash 1591342470, now seen corresponding path program 13 times [2022-03-20 19:13:33,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:33,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1719555370] [2022-03-20 19:13:33,859 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:33,859 INFO L85 PathProgramCache]: Analyzing trace with hash 738227751, now seen corresponding path program 1 times [2022-03-20 19:13:33,860 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:33,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [473248792] [2022-03-20 19:13:33,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:33,860 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:33,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:33,890 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:33,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:33,900 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:33,900 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:33,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [473248792] [2022-03-20 19:13:33,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [473248792] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:33,900 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:33,900 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:34,215 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:34,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1719555370] [2022-03-20 19:13:34,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1719555370] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:34,215 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:34,215 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 19:13:34,215 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649570552] [2022-03-20 19:13:34,215 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:34,215 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 19:13:34,216 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:34,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 19:13:34,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=280, Unknown=0, NotChecked=0, Total=420 [2022-03-20 19:13:34,216 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand has 21 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:34,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:34,575 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2022-03-20 19:13:34,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 19:13:34,576 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-03-20 19:13:34,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:34,576 INFO L225 Difference]: With dead ends: 32 [2022-03-20 19:13:34,576 INFO L226 Difference]: Without dead ends: 27 [2022-03-20 19:13:34,577 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=414, Invalid=1068, Unknown=0, NotChecked=0, Total=1482 [2022-03-20 19:13:34,577 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:34,577 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 41 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:34,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-20 19:13:34,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-03-20 19:13:34,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:34,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2022-03-20 19:13:34,581 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2022-03-20 19:13:34,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:34,581 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2022-03-20 19:13:34,581 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:34,581 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2022-03-20 19:13:34,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-20 19:13:34,582 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:34,582 INFO L499 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:34,582 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-03-20 19:13:34,582 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:34,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:34,583 INFO L85 PathProgramCache]: Analyzing trace with hash 2122365144, now seen corresponding path program 14 times [2022-03-20 19:13:34,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:34,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [581387365] [2022-03-20 19:13:34,725 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:34,726 INFO L85 PathProgramCache]: Analyzing trace with hash 797333095, now seen corresponding path program 1 times [2022-03-20 19:13:34,726 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:34,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070261271] [2022-03-20 19:13:34,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:34,726 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:34,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:34,760 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:34,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:34,763 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:34,763 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:34,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070261271] [2022-03-20 19:13:34,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070261271] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:34,764 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:34,764 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:35,126 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:35,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [581387365] [2022-03-20 19:13:35,126 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [581387365] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:35,126 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:35,126 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 19:13:35,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136296555] [2022-03-20 19:13:35,126 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:35,127 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 19:13:35,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:35,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 19:13:35,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=306, Unknown=0, NotChecked=0, Total=462 [2022-03-20 19:13:35,127 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 22 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:35,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:35,520 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2022-03-20 19:13:35,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-20 19:13:35,520 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-03-20 19:13:35,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:35,520 INFO L225 Difference]: With dead ends: 33 [2022-03-20 19:13:35,520 INFO L226 Difference]: Without dead ends: 28 [2022-03-20 19:13:35,521 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=462, Invalid=1178, Unknown=0, NotChecked=0, Total=1640 [2022-03-20 19:13:35,522 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:35,522 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 36 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:35,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-20 19:13:35,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-03-20 19:13:35,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 23 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:35,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2022-03-20 19:13:35,525 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2022-03-20 19:13:35,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:35,525 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2022-03-20 19:13:35,525 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:35,526 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2022-03-20 19:13:35,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 19:13:35,526 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:35,526 INFO L499 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:35,526 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-03-20 19:13:35,526 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:35,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:35,527 INFO L85 PathProgramCache]: Analyzing trace with hash 1404198854, now seen corresponding path program 15 times [2022-03-20 19:13:35,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:35,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1930656300] [2022-03-20 19:13:35,632 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:35,632 INFO L85 PathProgramCache]: Analyzing trace with hash 856438439, now seen corresponding path program 1 times [2022-03-20 19:13:35,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:35,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456053153] [2022-03-20 19:13:35,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:35,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:35,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:35,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:35,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:35,670 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:35,670 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:35,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456053153] [2022-03-20 19:13:35,670 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1456053153] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:35,670 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:35,670 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:36,127 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:36,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1930656300] [2022-03-20 19:13:36,127 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1930656300] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:36,127 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:36,128 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 19:13:36,128 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362454605] [2022-03-20 19:13:36,128 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:36,128 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 19:13:36,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:36,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 19:13:36,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=333, Unknown=0, NotChecked=0, Total=506 [2022-03-20 19:13:36,129 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand has 23 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 21 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) [2022-03-20 19:13:36,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:36,596 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2022-03-20 19:13:36,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 19:13:36,597 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 21 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 [2022-03-20 19:13:36,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:36,597 INFO L225 Difference]: With dead ends: 34 [2022-03-20 19:13:36,598 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 19:13:36,598 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=513, Invalid=1293, Unknown=0, NotChecked=0, Total=1806 [2022-03-20 19:13:36,599 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:36,599 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 61 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:13:36,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 19:13:36,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-20 19:13:36,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:36,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2022-03-20 19:13:36,603 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2022-03-20 19:13:36,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:36,603 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2022-03-20 19:13:36,604 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 21 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) [2022-03-20 19:13:36,604 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2022-03-20 19:13:36,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 19:13:36,604 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:36,604 INFO L499 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:36,604 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-03-20 19:13:36,604 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:36,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:36,605 INFO L85 PathProgramCache]: Analyzing trace with hash 615880344, now seen corresponding path program 16 times [2022-03-20 19:13:36,605 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:36,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2097258604] [2022-03-20 19:13:36,722 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:36,723 INFO L85 PathProgramCache]: Analyzing trace with hash 915543783, now seen corresponding path program 1 times [2022-03-20 19:13:36,723 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:36,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [780371550] [2022-03-20 19:13:36,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:36,723 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:36,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:36,768 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:36,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:36,774 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:36,774 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:36,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [780371550] [2022-03-20 19:13:36,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [780371550] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:36,774 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:36,774 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:37,220 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:37,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2097258604] [2022-03-20 19:13:37,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2097258604] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:37,220 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:37,220 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 19:13:37,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922836471] [2022-03-20 19:13:37,220 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:37,220 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-20 19:13:37,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:37,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-20 19:13:37,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=361, Unknown=0, NotChecked=0, Total=552 [2022-03-20 19:13:37,221 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand has 24 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:37,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:37,738 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2022-03-20 19:13:37,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-20 19:13:37,739 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2022-03-20 19:13:37,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:37,740 INFO L225 Difference]: With dead ends: 35 [2022-03-20 19:13:37,740 INFO L226 Difference]: Without dead ends: 30 [2022-03-20 19:13:37,740 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=567, Invalid=1413, Unknown=0, NotChecked=0, Total=1980 [2022-03-20 19:13:37,741 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:37,741 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 36 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:37,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-20 19:13:37,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-03-20 19:13:37,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.04) internal successors, (26), 25 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) [2022-03-20 19:13:37,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2022-03-20 19:13:37,745 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2022-03-20 19:13:37,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:37,745 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2022-03-20 19:13:37,745 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:37,745 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2022-03-20 19:13:37,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 19:13:37,746 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:37,746 INFO L499 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:37,746 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-03-20 19:13:37,746 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:37,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:37,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1947810310, now seen corresponding path program 17 times [2022-03-20 19:13:37,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:37,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [528243696] [2022-03-20 19:13:37,909 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:37,909 INFO L85 PathProgramCache]: Analyzing trace with hash 974649127, now seen corresponding path program 1 times [2022-03-20 19:13:37,910 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:37,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520245164] [2022-03-20 19:13:37,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:37,910 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:37,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:37,940 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:37,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:37,943 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:37,944 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:37,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520245164] [2022-03-20 19:13:37,944 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520245164] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:37,944 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:37,944 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:38,446 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:38,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [528243696] [2022-03-20 19:13:38,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [528243696] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:38,447 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:38,447 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-20 19:13:38,447 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663335400] [2022-03-20 19:13:38,447 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:38,447 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-20 19:13:38,447 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:38,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-20 19:13:38,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=390, Unknown=0, NotChecked=0, Total=600 [2022-03-20 19:13:38,448 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand has 25 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:39,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:39,059 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2022-03-20 19:13:39,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-20 19:13:39,059 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-03-20 19:13:39,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:39,060 INFO L225 Difference]: With dead ends: 36 [2022-03-20 19:13:39,060 INFO L226 Difference]: Without dead ends: 31 [2022-03-20 19:13:39,061 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=624, Invalid=1538, Unknown=0, NotChecked=0, Total=2162 [2022-03-20 19:13:39,061 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:39,061 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 31 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:13:39,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-20 19:13:39,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-03-20 19:13:39,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:39,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2022-03-20 19:13:39,065 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2022-03-20 19:13:39,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:39,066 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2022-03-20 19:13:39,066 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:39,066 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2022-03-20 19:13:39,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-20 19:13:39,066 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:39,066 INFO L499 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:39,067 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-03-20 19:13:39,067 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:39,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:39,067 INFO L85 PathProgramCache]: Analyzing trace with hash 287966296, now seen corresponding path program 18 times [2022-03-20 19:13:39,067 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:39,067 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [665498840] [2022-03-20 19:13:39,199 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:39,199 INFO L85 PathProgramCache]: Analyzing trace with hash 1033754471, now seen corresponding path program 1 times [2022-03-20 19:13:39,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:39,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139413383] [2022-03-20 19:13:39,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:39,200 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:39,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:39,236 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:39,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:39,241 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:39,241 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:39,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139413383] [2022-03-20 19:13:39,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1139413383] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:39,241 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:39,241 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:39,800 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:39,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [665498840] [2022-03-20 19:13:39,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [665498840] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:39,800 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:39,800 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-20 19:13:39,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907466476] [2022-03-20 19:13:39,801 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:39,801 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-20 19:13:39,801 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:39,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-20 19:13:39,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=420, Unknown=0, NotChecked=0, Total=650 [2022-03-20 19:13:39,801 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand has 26 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:40,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:40,469 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2022-03-20 19:13:40,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-20 19:13:40,469 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2022-03-20 19:13:40,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:40,470 INFO L225 Difference]: With dead ends: 37 [2022-03-20 19:13:40,470 INFO L226 Difference]: Without dead ends: 32 [2022-03-20 19:13:40,470 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 375 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=684, Invalid=1668, Unknown=0, NotChecked=0, Total=2352 [2022-03-20 19:13:40,471 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:40,471 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 51 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:13:40,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-20 19:13:40,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-03-20 19:13:40,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.037037037037037) internal successors, (28), 27 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:40,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2022-03-20 19:13:40,475 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2022-03-20 19:13:40,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:40,475 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2022-03-20 19:13:40,475 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:40,475 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2022-03-20 19:13:40,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-20 19:13:40,476 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:40,476 INFO L499 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:40,476 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-03-20 19:13:40,476 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:40,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:40,476 INFO L85 PathProgramCache]: Analyzing trace with hash 372409414, now seen corresponding path program 19 times [2022-03-20 19:13:40,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:40,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1323579822] [2022-03-20 19:13:40,610 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:40,611 INFO L85 PathProgramCache]: Analyzing trace with hash 1092859815, now seen corresponding path program 1 times [2022-03-20 19:13:40,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:40,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1270329030] [2022-03-20 19:13:40,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:40,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:40,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:40,647 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:40,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:40,651 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:40,651 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:40,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1270329030] [2022-03-20 19:13:40,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1270329030] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:40,651 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:40,651 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:41,272 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:41,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1323579822] [2022-03-20 19:13:41,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1323579822] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:41,272 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:41,273 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-20 19:13:41,273 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124732059] [2022-03-20 19:13:41,273 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:41,273 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-20 19:13:41,273 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:41,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-20 19:13:41,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=451, Unknown=0, NotChecked=0, Total=702 [2022-03-20 19:13:41,274 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand has 27 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:41,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:41,964 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2022-03-20 19:13:41,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-20 19:13:41,964 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-03-20 19:13:41,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:41,965 INFO L225 Difference]: With dead ends: 38 [2022-03-20 19:13:41,965 INFO L226 Difference]: Without dead ends: 33 [2022-03-20 19:13:41,965 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=747, Invalid=1803, Unknown=0, NotChecked=0, Total=2550 [2022-03-20 19:13:41,966 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:41,966 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 16 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:41,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-20 19:13:41,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-20 19:13:41,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 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) [2022-03-20 19:13:41,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2022-03-20 19:13:41,970 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2022-03-20 19:13:41,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:41,970 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2022-03-20 19:13:41,970 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:41,970 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2022-03-20 19:13:41,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 19:13:41,971 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:41,971 INFO L499 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:41,971 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-03-20 19:13:41,971 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:41,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:41,971 INFO L85 PathProgramCache]: Analyzing trace with hash -1304821224, now seen corresponding path program 20 times [2022-03-20 19:13:41,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:41,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1826710804] [2022-03-20 19:13:42,091 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:42,092 INFO L85 PathProgramCache]: Analyzing trace with hash 1151965159, now seen corresponding path program 1 times [2022-03-20 19:13:42,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:42,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410983261] [2022-03-20 19:13:42,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:42,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:42,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:42,138 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:42,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:42,141 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:42,142 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:42,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410983261] [2022-03-20 19:13:42,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1410983261] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:42,142 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:42,142 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:42,824 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:42,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1826710804] [2022-03-20 19:13:42,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1826710804] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:42,824 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:42,825 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-20 19:13:42,825 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528853900] [2022-03-20 19:13:42,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:42,825 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-20 19:13:42,825 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:42,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-20 19:13:42,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=483, Unknown=0, NotChecked=0, Total=756 [2022-03-20 19:13:42,826 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand has 28 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 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) [2022-03-20 19:13:43,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:43,631 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2022-03-20 19:13:43,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-20 19:13:43,632 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 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 [2022-03-20 19:13:43,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:43,632 INFO L225 Difference]: With dead ends: 39 [2022-03-20 19:13:43,633 INFO L226 Difference]: Without dead ends: 34 [2022-03-20 19:13:43,634 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 436 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=813, Invalid=1943, Unknown=0, NotChecked=0, Total=2756 [2022-03-20 19:13:43,634 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 13 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:43,634 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 56 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:13:43,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-20 19:13:43,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-03-20 19:13:43,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 29 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:43,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2022-03-20 19:13:43,638 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2022-03-20 19:13:43,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:43,638 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2022-03-20 19:13:43,638 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 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) [2022-03-20 19:13:43,639 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2022-03-20 19:13:43,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 19:13:43,639 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:43,639 INFO L499 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:43,639 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-03-20 19:13:43,639 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:43,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:43,640 INFO L85 PathProgramCache]: Analyzing trace with hash -1759363450, now seen corresponding path program 21 times [2022-03-20 19:13:43,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:43,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1588637935] [2022-03-20 19:13:43,808 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:43,808 INFO L85 PathProgramCache]: Analyzing trace with hash 1211070503, now seen corresponding path program 1 times [2022-03-20 19:13:43,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:43,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434361905] [2022-03-20 19:13:43,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:43,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:43,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:43,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:43,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:43,845 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:43,845 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:43,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434361905] [2022-03-20 19:13:43,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1434361905] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:43,845 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:43,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:44,615 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:44,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1588637935] [2022-03-20 19:13:44,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1588637935] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:44,615 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:44,615 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-03-20 19:13:44,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181649145] [2022-03-20 19:13:44,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:44,615 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-20 19:13:44,616 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:44,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-20 19:13:44,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=516, Unknown=0, NotChecked=0, Total=812 [2022-03-20 19:13:44,616 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand has 29 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:45,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:45,511 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2022-03-20 19:13:45,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-20 19:13:45,511 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2022-03-20 19:13:45,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:45,512 INFO L225 Difference]: With dead ends: 40 [2022-03-20 19:13:45,512 INFO L226 Difference]: Without dead ends: 35 [2022-03-20 19:13:45,513 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=882, Invalid=2088, Unknown=0, NotChecked=0, Total=2970 [2022-03-20 19:13:45,513 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:45,514 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 31 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:13:45,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-20 19:13:45,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-20 19:13:45,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:45,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2022-03-20 19:13:45,518 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2022-03-20 19:13:45,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:45,518 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2022-03-20 19:13:45,518 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:45,518 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2022-03-20 19:13:45,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 19:13:45,519 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:45,519 INFO L499 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:45,519 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-03-20 19:13:45,519 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:45,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:45,520 INFO L85 PathProgramCache]: Analyzing trace with hash 1329696728, now seen corresponding path program 22 times [2022-03-20 19:13:45,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:45,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1583428240] [2022-03-20 19:13:45,618 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:45,618 INFO L85 PathProgramCache]: Analyzing trace with hash 1270175847, now seen corresponding path program 1 times [2022-03-20 19:13:45,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:45,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83498145] [2022-03-20 19:13:45,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:45,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:45,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:45,664 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:45,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:45,668 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:45,668 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:45,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83498145] [2022-03-20 19:13:45,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83498145] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:45,668 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:45,668 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:46,544 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:46,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1583428240] [2022-03-20 19:13:46,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1583428240] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:46,545 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:46,545 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-20 19:13:46,545 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728576452] [2022-03-20 19:13:46,545 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:46,545 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-20 19:13:46,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:46,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-20 19:13:46,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=550, Unknown=0, NotChecked=0, Total=870 [2022-03-20 19:13:46,546 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand has 30 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 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) [2022-03-20 19:13:47,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:47,512 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2022-03-20 19:13:47,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-20 19:13:47,513 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 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 [2022-03-20 19:13:47,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:47,513 INFO L225 Difference]: With dead ends: 41 [2022-03-20 19:13:47,513 INFO L226 Difference]: Without dead ends: 36 [2022-03-20 19:13:47,514 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 501 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=954, Invalid=2238, Unknown=0, NotChecked=0, Total=3192 [2022-03-20 19:13:47,514 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:47,515 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 26 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:13:47,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-03-20 19:13:47,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-03-20 19:13:47,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.032258064516129) internal successors, (32), 31 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) [2022-03-20 19:13:47,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2022-03-20 19:13:47,518 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2022-03-20 19:13:47,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:47,518 INFO L478 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2022-03-20 19:13:47,518 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 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) [2022-03-20 19:13:47,519 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2022-03-20 19:13:47,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 19:13:47,519 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:47,519 INFO L499 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:47,519 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-03-20 19:13:47,519 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:47,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:47,519 INFO L85 PathProgramCache]: Analyzing trace with hash -1693685562, now seen corresponding path program 23 times [2022-03-20 19:13:47,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:47,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1770334992] [2022-03-20 19:13:47,662 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:47,662 INFO L85 PathProgramCache]: Analyzing trace with hash 1329281191, now seen corresponding path program 1 times [2022-03-20 19:13:47,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:47,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1859876324] [2022-03-20 19:13:47,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:47,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:47,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:47,698 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:47,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:47,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:47,701 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:47,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1859876324] [2022-03-20 19:13:47,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1859876324] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:47,701 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:47,701 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:48,695 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:48,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1770334992] [2022-03-20 19:13:48,696 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1770334992] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:48,696 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:48,696 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-20 19:13:48,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806301899] [2022-03-20 19:13:48,696 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:48,696 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-03-20 19:13:48,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:48,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-03-20 19:13:48,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=585, Unknown=0, NotChecked=0, Total=930 [2022-03-20 19:13:48,697 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand has 31 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:49,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:49,774 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2022-03-20 19:13:49,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-20 19:13:49,774 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-03-20 19:13:49,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:49,775 INFO L225 Difference]: With dead ends: 42 [2022-03-20 19:13:49,775 INFO L226 Difference]: Without dead ends: 37 [2022-03-20 19:13:49,776 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 535 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1029, Invalid=2393, Unknown=0, NotChecked=0, Total=3422 [2022-03-20 19:13:49,776 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:49,776 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 31 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:13:49,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-03-20 19:13:49,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-03-20 19:13:49,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:49,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2022-03-20 19:13:49,780 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2022-03-20 19:13:49,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:49,780 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2022-03-20 19:13:49,781 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:49,781 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2022-03-20 19:13:49,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-20 19:13:49,781 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:49,781 INFO L499 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:49,781 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-03-20 19:13:49,781 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:49,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:49,782 INFO L85 PathProgramCache]: Analyzing trace with hash -929256040, now seen corresponding path program 24 times [2022-03-20 19:13:49,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:49,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1727077636] [2022-03-20 19:13:49,915 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:49,915 INFO L85 PathProgramCache]: Analyzing trace with hash 1388386535, now seen corresponding path program 1 times [2022-03-20 19:13:49,916 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:49,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [265019485] [2022-03-20 19:13:49,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:49,916 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:49,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:49,949 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:49,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:49,953 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:49,953 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:49,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [265019485] [2022-03-20 19:13:49,953 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [265019485] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:49,953 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:49,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:51,069 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:51,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1727077636] [2022-03-20 19:13:51,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1727077636] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:51,069 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:51,069 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-03-20 19:13:51,069 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70808627] [2022-03-20 19:13:51,069 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:51,069 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-03-20 19:13:51,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:51,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-03-20 19:13:51,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=621, Unknown=0, NotChecked=0, Total=992 [2022-03-20 19:13:51,070 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand has 32 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:52,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:52,397 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2022-03-20 19:13:52,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-03-20 19:13:52,398 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2022-03-20 19:13:52,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:52,398 INFO L225 Difference]: With dead ends: 43 [2022-03-20 19:13:52,399 INFO L226 Difference]: Without dead ends: 38 [2022-03-20 19:13:52,400 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 570 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1107, Invalid=2553, Unknown=0, NotChecked=0, Total=3660 [2022-03-20 19:13:52,400 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:52,400 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 36 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:13:52,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-20 19:13:52,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-03-20 19:13:52,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 33 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:52,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2022-03-20 19:13:52,404 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2022-03-20 19:13:52,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:52,404 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2022-03-20 19:13:52,405 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:52,405 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2022-03-20 19:13:52,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 19:13:52,405 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:52,405 INFO L499 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:52,405 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-03-20 19:13:52,405 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:52,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:52,406 INFO L85 PathProgramCache]: Analyzing trace with hash 1293222662, now seen corresponding path program 25 times [2022-03-20 19:13:52,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:52,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1163170309] [2022-03-20 19:13:52,510 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:52,510 INFO L85 PathProgramCache]: Analyzing trace with hash 1447491879, now seen corresponding path program 1 times [2022-03-20 19:13:52,510 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:52,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271388920] [2022-03-20 19:13:52,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:52,510 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:52,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:52,549 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:52,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:52,553 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:52,553 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:52,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271388920] [2022-03-20 19:13:52,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271388920] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:52,553 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:52,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:53,834 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:53,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1163170309] [2022-03-20 19:13:53,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1163170309] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:53,835 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:53,835 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-03-20 19:13:53,835 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753973228] [2022-03-20 19:13:53,835 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:53,835 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-03-20 19:13:53,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:53,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-03-20 19:13:53,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=398, Invalid=658, Unknown=0, NotChecked=0, Total=1056 [2022-03-20 19:13:53,836 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand has 33 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 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) [2022-03-20 19:13:55,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:55,250 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2022-03-20 19:13:55,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-20 19:13:55,251 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 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 [2022-03-20 19:13:55,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:55,251 INFO L225 Difference]: With dead ends: 44 [2022-03-20 19:13:55,252 INFO L226 Difference]: Without dead ends: 39 [2022-03-20 19:13:55,253 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 606 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1188, Invalid=2718, Unknown=0, NotChecked=0, Total=3906 [2022-03-20 19:13:55,253 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:55,253 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 36 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:13:55,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-20 19:13:55,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-03-20 19:13:55,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 34 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:55,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2022-03-20 19:13:55,257 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2022-03-20 19:13:55,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:55,258 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2022-03-20 19:13:55,258 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 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) [2022-03-20 19:13:55,258 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2022-03-20 19:13:55,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 19:13:55,258 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:55,258 INFO L499 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:55,258 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2022-03-20 19:13:55,258 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:55,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:55,259 INFO L85 PathProgramCache]: Analyzing trace with hash 1470585688, now seen corresponding path program 26 times [2022-03-20 19:13:55,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:55,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [186293357] [2022-03-20 19:13:55,362 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:55,363 INFO L85 PathProgramCache]: Analyzing trace with hash 1506597223, now seen corresponding path program 1 times [2022-03-20 19:13:55,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:55,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1028181317] [2022-03-20 19:13:55,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:55,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:55,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:55,399 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:55,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:55,402 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:55,402 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:55,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1028181317] [2022-03-20 19:13:55,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1028181317] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:55,402 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:55,402 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:13:56,844 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:13:56,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [186293357] [2022-03-20 19:13:56,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [186293357] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:56,844 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:56,844 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-03-20 19:13:56,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004348729] [2022-03-20 19:13:56,844 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:13:56,845 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-03-20 19:13:56,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:56,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-03-20 19:13:56,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=696, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 19:13:56,845 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand has 34 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:58,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:13:58,431 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2022-03-20 19:13:58,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-20 19:13:58,432 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2022-03-20 19:13:58,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:13:58,433 INFO L225 Difference]: With dead ends: 45 [2022-03-20 19:13:58,433 INFO L226 Difference]: Without dead ends: 40 [2022-03-20 19:13:58,434 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1272, Invalid=2888, Unknown=0, NotChecked=0, Total=4160 [2022-03-20 19:13:58,434 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:13:58,446 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 56 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:13:58,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-03-20 19:13:58,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-03-20 19:13:58,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 35 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:58,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2022-03-20 19:13:58,450 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2022-03-20 19:13:58,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:13:58,450 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2022-03-20 19:13:58,450 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:13:58,450 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2022-03-20 19:13:58,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 19:13:58,450 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:13:58,450 INFO L499 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:13:58,450 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2022-03-20 19:13:58,450 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:13:58,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:13:58,451 INFO L85 PathProgramCache]: Analyzing trace with hash -1621095098, now seen corresponding path program 27 times [2022-03-20 19:13:58,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:13:58,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1428039957] [2022-03-20 19:13:58,560 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:13:58,561 INFO L85 PathProgramCache]: Analyzing trace with hash 1565702567, now seen corresponding path program 1 times [2022-03-20 19:13:58,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:13:58,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076428207] [2022-03-20 19:13:58,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:13:58,561 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:13:58,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:58,603 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:13:58,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:13:58,606 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:13:58,606 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:13:58,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076428207] [2022-03-20 19:13:58,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1076428207] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:13:58,606 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:13:58,606 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:14:00,202 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:14:00,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1428039957] [2022-03-20 19:14:00,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1428039957] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:00,202 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:00,202 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-03-20 19:14:00,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460253707] [2022-03-20 19:14:00,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:14:00,203 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-20 19:14:00,203 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:00,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-20 19:14:00,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=735, Unknown=0, NotChecked=0, Total=1190 [2022-03-20 19:14:00,204 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand has 35 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:02,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:14:02,003 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2022-03-20 19:14:02,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-03-20 19:14:02,004 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2022-03-20 19:14:02,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:14:02,004 INFO L225 Difference]: With dead ends: 46 [2022-03-20 19:14:02,004 INFO L226 Difference]: Without dead ends: 41 [2022-03-20 19:14:02,005 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 681 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1359, Invalid=3063, Unknown=0, NotChecked=0, Total=4422 [2022-03-20 19:14:02,006 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:14:02,006 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 46 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:14:02,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-20 19:14:02,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-03-20 19:14:02,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:02,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2022-03-20 19:14:02,009 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2022-03-20 19:14:02,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:14:02,009 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2022-03-20 19:14:02,009 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:02,010 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2022-03-20 19:14:02,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-20 19:14:02,010 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:14:02,010 INFO L499 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:14:02,010 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-03-20 19:14:02,010 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:14:02,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:14:02,011 INFO L85 PathProgramCache]: Analyzing trace with hash 1321048344, now seen corresponding path program 28 times [2022-03-20 19:14:02,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:02,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2030536483] [2022-03-20 19:14:02,172 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:14:02,172 INFO L85 PathProgramCache]: Analyzing trace with hash 1624807911, now seen corresponding path program 1 times [2022-03-20 19:14:02,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:14:02,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466321473] [2022-03-20 19:14:02,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:14:02,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:14:02,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:02,215 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:14:02,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:02,218 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:14:02,218 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:14:02,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466321473] [2022-03-20 19:14:02,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466321473] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:02,218 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:02,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:14:04,038 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:14:04,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2030536483] [2022-03-20 19:14:04,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2030536483] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:04,038 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:04,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-03-20 19:14:04,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599401592] [2022-03-20 19:14:04,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:14:04,039 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-03-20 19:14:04,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:04,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-03-20 19:14:04,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=485, Invalid=775, Unknown=0, NotChecked=0, Total=1260 [2022-03-20 19:14:04,040 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand has 36 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:06,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:14:06,016 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2022-03-20 19:14:06,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-03-20 19:14:06,017 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2022-03-20 19:14:06,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:14:06,018 INFO L225 Difference]: With dead ends: 47 [2022-03-20 19:14:06,018 INFO L226 Difference]: Without dead ends: 42 [2022-03-20 19:14:06,019 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 720 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1449, Invalid=3243, Unknown=0, NotChecked=0, Total=4692 [2022-03-20 19:14:06,019 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:14:06,019 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 51 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:14:06,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-20 19:14:06,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-03-20 19:14:06,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.027027027027027) internal successors, (38), 37 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:06,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2022-03-20 19:14:06,023 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2022-03-20 19:14:06,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:14:06,023 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2022-03-20 19:14:06,024 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:06,024 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2022-03-20 19:14:06,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 19:14:06,024 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:14:06,024 INFO L499 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:14:06,024 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2022-03-20 19:14:06,024 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:14:06,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:14:06,025 INFO L85 PathProgramCache]: Analyzing trace with hash -1961785466, now seen corresponding path program 29 times [2022-03-20 19:14:06,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:06,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1806513225] [2022-03-20 19:14:06,174 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:14:06,175 INFO L85 PathProgramCache]: Analyzing trace with hash 1683913255, now seen corresponding path program 1 times [2022-03-20 19:14:06,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:14:06,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1828610964] [2022-03-20 19:14:06,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:14:06,175 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:14:06,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:06,227 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:14:06,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:06,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:14:06,235 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:14:06,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1828610964] [2022-03-20 19:14:06,235 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1828610964] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:06,235 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:06,236 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:14:08,280 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:14:08,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1806513225] [2022-03-20 19:14:08,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1806513225] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:08,281 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:08,281 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-03-20 19:14:08,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041507448] [2022-03-20 19:14:08,281 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:14:08,281 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-03-20 19:14:08,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:08,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-03-20 19:14:08,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=516, Invalid=816, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 19:14:08,282 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand has 37 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:10,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:14:10,487 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2022-03-20 19:14:10,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-20 19:14:10,488 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2022-03-20 19:14:10,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:14:10,489 INFO L225 Difference]: With dead ends: 48 [2022-03-20 19:14:10,489 INFO L226 Difference]: Without dead ends: 43 [2022-03-20 19:14:10,490 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 760 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=1542, Invalid=3428, Unknown=0, NotChecked=0, Total=4970 [2022-03-20 19:14:10,490 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:14:10,491 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 41 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:14:10,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-20 19:14:10,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-03-20 19:14:10,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 38 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:10,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2022-03-20 19:14:10,494 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2022-03-20 19:14:10,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:14:10,495 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2022-03-20 19:14:10,495 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:10,495 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2022-03-20 19:14:10,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 19:14:10,495 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:14:10,495 INFO L499 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:14:10,495 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-03-20 19:14:10,496 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:14:10,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:14:10,496 INFO L85 PathProgramCache]: Analyzing trace with hash -650418472, now seen corresponding path program 30 times [2022-03-20 19:14:10,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:10,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1932412295] [2022-03-20 19:14:10,638 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:14:10,639 INFO L85 PathProgramCache]: Analyzing trace with hash 1743018599, now seen corresponding path program 1 times [2022-03-20 19:14:10,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:14:10,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363752082] [2022-03-20 19:14:10,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:14:10,639 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:14:10,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:10,688 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:14:10,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:10,691 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:14:10,691 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:14:10,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363752082] [2022-03-20 19:14:10,691 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [363752082] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:10,692 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:10,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:14:13,009 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:14:13,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1932412295] [2022-03-20 19:14:13,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1932412295] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:13,009 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:13,009 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-03-20 19:14:13,009 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764302345] [2022-03-20 19:14:13,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:14:13,010 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-20 19:14:13,010 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:13,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-20 19:14:13,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=548, Invalid=858, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 19:14:13,011 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand has 38 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:15,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:14:15,444 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2022-03-20 19:14:15,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-03-20 19:14:15,444 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2022-03-20 19:14:15,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:14:15,445 INFO L225 Difference]: With dead ends: 49 [2022-03-20 19:14:15,445 INFO L226 Difference]: Without dead ends: 44 [2022-03-20 19:14:15,446 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 801 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1638, Invalid=3618, Unknown=0, NotChecked=0, Total=5256 [2022-03-20 19:14:15,446 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 18 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:14:15,446 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 41 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:14:15,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-20 19:14:15,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-03-20 19:14:15,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 39 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:15,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2022-03-20 19:14:15,450 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2022-03-20 19:14:15,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:14:15,450 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2022-03-20 19:14:15,450 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:15,450 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2022-03-20 19:14:15,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 19:14:15,450 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:14:15,450 INFO L499 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:14:15,451 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-03-20 19:14:15,451 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:14:15,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:14:15,451 INFO L85 PathProgramCache]: Analyzing trace with hash 1347252678, now seen corresponding path program 31 times [2022-03-20 19:14:15,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:15,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [268413473] [2022-03-20 19:14:15,558 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:14:15,558 INFO L85 PathProgramCache]: Analyzing trace with hash 1802123943, now seen corresponding path program 1 times [2022-03-20 19:14:15,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:14:15,559 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151963423] [2022-03-20 19:14:15,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:14:15,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:14:15,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:15,607 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:14:15,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:15,611 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:14:15,611 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:14:15,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151963423] [2022-03-20 19:14:15,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151963423] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:15,611 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:15,611 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:14:18,116 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:14:18,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [268413473] [2022-03-20 19:14:18,116 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [268413473] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:18,116 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:18,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-03-20 19:14:18,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319769000] [2022-03-20 19:14:18,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:14:18,117 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-03-20 19:14:18,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:18,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-03-20 19:14:18,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=581, Invalid=901, Unknown=0, NotChecked=0, Total=1482 [2022-03-20 19:14:18,118 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand has 39 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 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) [2022-03-20 19:14:20,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:14:20,838 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2022-03-20 19:14:20,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-03-20 19:14:20,839 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 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 [2022-03-20 19:14:20,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:14:20,840 INFO L225 Difference]: With dead ends: 50 [2022-03-20 19:14:20,840 INFO L226 Difference]: Without dead ends: 45 [2022-03-20 19:14:20,841 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 843 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=1737, Invalid=3813, Unknown=0, NotChecked=0, Total=5550 [2022-03-20 19:14:20,841 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 18 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:14:20,842 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 31 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:14:20,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-20 19:14:20,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-03-20 19:14:20,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.025) internal successors, (41), 40 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:20,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2022-03-20 19:14:20,845 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2022-03-20 19:14:20,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:14:20,845 INFO L478 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2022-03-20 19:14:20,845 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 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) [2022-03-20 19:14:20,845 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2022-03-20 19:14:20,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 19:14:20,846 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:14:20,846 INFO L499 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:14:20,846 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2022-03-20 19:14:20,846 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:14:20,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:14:20,846 INFO L85 PathProgramCache]: Analyzing trace with hash -1149451112, now seen corresponding path program 32 times [2022-03-20 19:14:20,846 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:20,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1816235027] [2022-03-20 19:14:21,045 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:14:21,045 INFO L85 PathProgramCache]: Analyzing trace with hash 1861229287, now seen corresponding path program 1 times [2022-03-20 19:14:21,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:14:21,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837910664] [2022-03-20 19:14:21,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:14:21,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:14:21,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:21,098 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:14:21,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:21,116 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:14:21,116 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:14:21,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837910664] [2022-03-20 19:14:21,116 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837910664] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:21,116 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:21,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:14:23,982 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:14:23,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1816235027] [2022-03-20 19:14:23,982 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1816235027] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:23,982 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:23,982 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-03-20 19:14:23,982 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281791009] [2022-03-20 19:14:23,982 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:14:23,983 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-03-20 19:14:23,983 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:23,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-03-20 19:14:23,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=615, Invalid=945, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 19:14:23,984 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand has 40 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:26,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:14:26,954 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2022-03-20 19:14:26,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-03-20 19:14:26,955 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-03-20 19:14:26,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:14:26,955 INFO L225 Difference]: With dead ends: 51 [2022-03-20 19:14:26,955 INFO L226 Difference]: Without dead ends: 46 [2022-03-20 19:14:26,956 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 886 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=1839, Invalid=4013, Unknown=0, NotChecked=0, Total=5852 [2022-03-20 19:14:26,957 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:14:26,957 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 21 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:14:26,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-03-20 19:14:26,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-03-20 19:14:26,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.024390243902439) internal successors, (42), 41 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:26,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2022-03-20 19:14:26,960 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2022-03-20 19:14:26,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:14:26,961 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2022-03-20 19:14:26,961 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:26,961 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2022-03-20 19:14:26,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-20 19:14:26,961 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:14:26,961 INFO L499 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:14:26,961 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2022-03-20 19:14:26,961 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:14:26,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:14:26,962 INFO L85 PathProgramCache]: Analyzing trace with hash -1237857274, now seen corresponding path program 33 times [2022-03-20 19:14:26,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:26,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1569707449] [2022-03-20 19:14:27,074 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:14:27,074 INFO L85 PathProgramCache]: Analyzing trace with hash 1920334631, now seen corresponding path program 1 times [2022-03-20 19:14:27,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:14:27,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947524471] [2022-03-20 19:14:27,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:14:27,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:14:27,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:27,124 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:14:27,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:27,134 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:14:27,134 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:14:27,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947524471] [2022-03-20 19:14:27,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [947524471] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:27,134 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:27,134 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:14:30,205 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:14:30,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1569707449] [2022-03-20 19:14:30,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1569707449] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:30,205 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:30,205 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-03-20 19:14:30,205 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700119429] [2022-03-20 19:14:30,205 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:14:30,206 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-03-20 19:14:30,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:30,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-03-20 19:14:30,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=650, Invalid=990, Unknown=0, NotChecked=0, Total=1640 [2022-03-20 19:14:30,206 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand has 41 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:33,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:14:33,539 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2022-03-20 19:14:33,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-03-20 19:14:33,540 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2022-03-20 19:14:33,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:14:33,541 INFO L225 Difference]: With dead ends: 52 [2022-03-20 19:14:33,541 INFO L226 Difference]: Without dead ends: 47 [2022-03-20 19:14:33,542 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 930 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=1944, Invalid=4218, Unknown=0, NotChecked=0, Total=6162 [2022-03-20 19:14:33,542 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 13 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:14:33,543 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 61 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:14:33,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-20 19:14:33,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-03-20 19:14:33,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 42 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) [2022-03-20 19:14:33,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2022-03-20 19:14:33,546 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2022-03-20 19:14:33,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:14:33,547 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2022-03-20 19:14:33,547 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:33,547 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2022-03-20 19:14:33,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 19:14:33,547 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:14:33,547 INFO L499 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:14:33,547 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2022-03-20 19:14:33,548 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:14:33,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:14:33,548 INFO L85 PathProgramCache]: Analyzing trace with hash 316519000, now seen corresponding path program 34 times [2022-03-20 19:14:33,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:33,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1053740505] [2022-03-20 19:14:33,698 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:14:33,698 INFO L85 PathProgramCache]: Analyzing trace with hash 1979439975, now seen corresponding path program 1 times [2022-03-20 19:14:33,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:14:33,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2022778090] [2022-03-20 19:14:33,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:14:33,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:14:33,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:33,752 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:14:33,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:33,762 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:14:33,762 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:14:33,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2022778090] [2022-03-20 19:14:33,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2022778090] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:33,763 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:33,763 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:14:37,163 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:14:37,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1053740505] [2022-03-20 19:14:37,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1053740505] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:37,164 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:37,164 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-03-20 19:14:37,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682566543] [2022-03-20 19:14:37,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:14:37,164 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-03-20 19:14:37,164 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:37,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-03-20 19:14:37,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=686, Invalid=1036, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 19:14:37,165 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand has 42 states, 40 states have (on average 1.05) internal successors, (42), 40 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) [2022-03-20 19:14:40,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:14:40,909 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2022-03-20 19:14:40,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-03-20 19:14:40,910 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 40 states have (on average 1.05) internal successors, (42), 40 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 [2022-03-20 19:14:40,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:14:40,910 INFO L225 Difference]: With dead ends: 53 [2022-03-20 19:14:40,910 INFO L226 Difference]: Without dead ends: 48 [2022-03-20 19:14:40,912 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 975 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=2052, Invalid=4428, Unknown=0, NotChecked=0, Total=6480 [2022-03-20 19:14:40,912 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:14:40,912 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 46 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:14:40,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-20 19:14:40,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-03-20 19:14:40,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.0232558139534884) internal successors, (44), 43 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:40,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2022-03-20 19:14:40,916 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2022-03-20 19:14:40,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:14:40,916 INFO L478 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2022-03-20 19:14:40,916 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 40 states have (on average 1.05) internal successors, (42), 40 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) [2022-03-20 19:14:40,916 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2022-03-20 19:14:40,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-20 19:14:40,917 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:14:40,917 INFO L499 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:14:40,917 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2022-03-20 19:14:40,917 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:14:40,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:14:40,917 INFO L85 PathProgramCache]: Analyzing trace with hash 1257543238, now seen corresponding path program 35 times [2022-03-20 19:14:40,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:40,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [275232177] [2022-03-20 19:14:41,128 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:14:41,129 INFO L85 PathProgramCache]: Analyzing trace with hash 2038545319, now seen corresponding path program 1 times [2022-03-20 19:14:41,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:14:41,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091233520] [2022-03-20 19:14:41,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:14:41,129 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:14:41,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:41,185 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:14:41,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:41,187 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:14:41,187 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:14:41,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091233520] [2022-03-20 19:14:41,188 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1091233520] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:41,188 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:41,188 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:14:44,969 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:14:44,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [275232177] [2022-03-20 19:14:44,970 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [275232177] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:44,970 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:44,970 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-03-20 19:14:44,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165766509] [2022-03-20 19:14:44,970 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:14:44,970 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-03-20 19:14:44,970 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:44,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-03-20 19:14:44,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=723, Invalid=1083, Unknown=0, NotChecked=0, Total=1806 [2022-03-20 19:14:44,971 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand has 43 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:49,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:14:49,187 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2022-03-20 19:14:49,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-03-20 19:14:49,188 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2022-03-20 19:14:49,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:14:49,189 INFO L225 Difference]: With dead ends: 54 [2022-03-20 19:14:49,189 INFO L226 Difference]: Without dead ends: 49 [2022-03-20 19:14:49,190 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1021 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=2163, Invalid=4643, Unknown=0, NotChecked=0, Total=6806 [2022-03-20 19:14:49,190 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 13 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:14:49,191 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 56 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:14:49,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-03-20 19:14:49,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-03-20 19:14:49,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 44 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:49,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2022-03-20 19:14:49,194 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2022-03-20 19:14:49,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:14:49,195 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2022-03-20 19:14:49,195 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:49,202 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2022-03-20 19:14:49,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 19:14:49,202 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:14:49,202 INFO L499 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:14:49,202 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2022-03-20 19:14:49,202 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:14:49,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:14:49,203 INFO L85 PathProgramCache]: Analyzing trace with hash 364523544, now seen corresponding path program 36 times [2022-03-20 19:14:49,203 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:49,203 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1669989222] [2022-03-20 19:14:49,323 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:14:49,323 INFO L85 PathProgramCache]: Analyzing trace with hash 2097650663, now seen corresponding path program 1 times [2022-03-20 19:14:49,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:14:49,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817643012] [2022-03-20 19:14:49,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:14:49,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:14:49,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:49,378 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:14:49,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:49,380 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:14:49,380 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:14:49,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817643012] [2022-03-20 19:14:49,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1817643012] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:49,381 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:49,381 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:14:53,794 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:14:53,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1669989222] [2022-03-20 19:14:53,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1669989222] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:53,795 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:53,795 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-03-20 19:14:53,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220479747] [2022-03-20 19:14:53,795 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:14:53,795 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-03-20 19:14:53,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:53,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-03-20 19:14:53,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=761, Invalid=1131, Unknown=0, NotChecked=0, Total=1892 [2022-03-20 19:14:53,796 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand has 44 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 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) [2022-03-20 19:14:58,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:14:58,766 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2022-03-20 19:14:58,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-03-20 19:14:58,768 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 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 [2022-03-20 19:14:58,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:14:58,768 INFO L225 Difference]: With dead ends: 55 [2022-03-20 19:14:58,768 INFO L226 Difference]: Without dead ends: 50 [2022-03-20 19:14:58,769 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1068 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=2277, Invalid=4863, Unknown=0, NotChecked=0, Total=7140 [2022-03-20 19:14:58,769 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:14:58,770 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 41 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:14:58,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-03-20 19:14:58,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-03-20 19:14:58,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0222222222222221) internal successors, (46), 45 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:14:58,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2022-03-20 19:14:58,774 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2022-03-20 19:14:58,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:14:58,774 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2022-03-20 19:14:58,774 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 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) [2022-03-20 19:14:58,774 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2022-03-20 19:14:58,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-20 19:14:58,774 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:14:58,775 INFO L499 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:14:58,775 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2022-03-20 19:14:58,775 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:14:58,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:14:58,775 INFO L85 PathProgramCache]: Analyzing trace with hash -1549283194, now seen corresponding path program 37 times [2022-03-20 19:14:58,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:14:58,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1756293287] [2022-03-20 19:14:58,898 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:14:58,899 INFO L85 PathProgramCache]: Analyzing trace with hash -2138211289, now seen corresponding path program 1 times [2022-03-20 19:14:58,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:14:58,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452801272] [2022-03-20 19:14:58,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:14:58,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:14:58,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:58,959 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:14:58,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:14:58,964 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:14:58,964 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:14:58,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452801272] [2022-03-20 19:14:58,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [452801272] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:14:58,964 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:14:58,964 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:15:04,160 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:15:04,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1756293287] [2022-03-20 19:15:04,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1756293287] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:04,161 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:04,161 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-03-20 19:15:04,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418003430] [2022-03-20 19:15:04,161 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:15:04,161 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-03-20 19:15:04,161 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:04,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-03-20 19:15:04,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=800, Invalid=1180, Unknown=0, NotChecked=0, Total=1980 [2022-03-20 19:15:04,162 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand has 45 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:15:09,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:15:09,887 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2022-03-20 19:15:09,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-03-20 19:15:09,888 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2022-03-20 19:15:09,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:15:09,889 INFO L225 Difference]: With dead ends: 56 [2022-03-20 19:15:09,890 INFO L226 Difference]: Without dead ends: 51 [2022-03-20 19:15:09,890 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1116 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=2394, Invalid=5088, Unknown=0, NotChecked=0, Total=7482 [2022-03-20 19:15:09,891 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:15:09,891 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 41 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:15:09,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-20 19:15:09,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-03-20 19:15:09,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 46 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:15:09,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2022-03-20 19:15:09,895 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2022-03-20 19:15:09,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:15:09,895 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2022-03-20 19:15:09,895 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:15:09,895 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2022-03-20 19:15:09,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-20 19:15:09,895 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:15:09,896 INFO L499 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:15:09,896 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2022-03-20 19:15:09,896 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:15:09,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:15:09,896 INFO L85 PathProgramCache]: Analyzing trace with hash -747749928, now seen corresponding path program 38 times [2022-03-20 19:15:09,896 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:09,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [129380507] [2022-03-20 19:15:10,029 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:15:10,029 INFO L85 PathProgramCache]: Analyzing trace with hash -2079105945, now seen corresponding path program 1 times [2022-03-20 19:15:10,030 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:10,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581948851] [2022-03-20 19:15:10,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:10,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:10,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:10,101 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:15:10,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:10,108 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:10,108 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:15:10,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581948851] [2022-03-20 19:15:10,109 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1581948851] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:10,109 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:10,109 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:15:16,233 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:15:16,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [129380507] [2022-03-20 19:15:16,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [129380507] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:16,234 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:16,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-03-20 19:15:16,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061787711] [2022-03-20 19:15:16,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:15:16,234 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-03-20 19:15:16,234 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:16,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-03-20 19:15:16,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=840, Invalid=1230, Unknown=0, NotChecked=0, Total=2070 [2022-03-20 19:15:16,235 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 46 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 44 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:15:31,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:15:31,246 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2022-03-20 19:15:31,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-03-20 19:15:31,248 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 44 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2022-03-20 19:15:31,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:15:31,248 INFO L225 Difference]: With dead ends: 57 [2022-03-20 19:15:31,248 INFO L226 Difference]: Without dead ends: 52 [2022-03-20 19:15:31,249 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1165 ImplicationChecksByTransitivity, 20.9s TimeCoverageRelationStatistics Valid=2514, Invalid=5318, Unknown=0, NotChecked=0, Total=7832 [2022-03-20 19:15:31,250 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 19:15:31,250 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 41 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 19:15:31,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-03-20 19:15:31,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-03-20 19:15:31,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0212765957446808) internal successors, (48), 47 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:15:31,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2022-03-20 19:15:31,253 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2022-03-20 19:15:31,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:15:31,253 INFO L478 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2022-03-20 19:15:31,253 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 44 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:15:31,254 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2022-03-20 19:15:31,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-03-20 19:15:31,254 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:15:31,254 INFO L499 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:15:31,254 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2022-03-20 19:15:31,254 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:15:31,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:15:31,254 INFO L85 PathProgramCache]: Analyzing trace with hash -1670022458, now seen corresponding path program 39 times [2022-03-20 19:15:31,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:31,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1602602171] [2022-03-20 19:15:31,621 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:15:31,621 INFO L85 PathProgramCache]: Analyzing trace with hash -2020000601, now seen corresponding path program 1 times [2022-03-20 19:15:31,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:15:31,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481412062] [2022-03-20 19:15:31,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:15:31,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:15:31,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:31,714 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:15:31,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:15:31,716 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:15:31,716 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:15:31,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481412062] [2022-03-20 19:15:31,716 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1481412062] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:31,716 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:31,717 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:15:45,149 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:15:45,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1602602171] [2022-03-20 19:15:45,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1602602171] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:15:45,150 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:15:45,150 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-03-20 19:15:45,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286510145] [2022-03-20 19:15:45,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:15:45,150 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-03-20 19:15:45,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:15:45,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-03-20 19:15:45,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=881, Invalid=1281, Unknown=0, NotChecked=0, Total=2162 [2022-03-20 19:15:45,151 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand has 47 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 45 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:16:04,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:16:04,233 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2022-03-20 19:16:04,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-03-20 19:16:04,237 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 45 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2022-03-20 19:16:04,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:16:04,238 INFO L225 Difference]: With dead ends: 58 [2022-03-20 19:16:04,238 INFO L226 Difference]: Without dead ends: 53 [2022-03-20 19:16:04,239 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1215 ImplicationChecksByTransitivity, 32.3s TimeCoverageRelationStatistics Valid=2637, Invalid=5553, Unknown=0, NotChecked=0, Total=8190 [2022-03-20 19:16:04,239 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 18 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 19:16:04,240 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 26 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 19:16:04,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-20 19:16:04,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-03-20 19:16:04,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 48 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) [2022-03-20 19:16:04,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2022-03-20 19:16:04,244 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2022-03-20 19:16:04,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:16:04,244 INFO L478 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2022-03-20 19:16:04,244 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 45 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:16:04,244 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2022-03-20 19:16:04,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-03-20 19:16:04,244 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:16:04,244 INFO L499 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:16:04,245 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2022-03-20 19:16:04,245 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:16:04,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:16:04,245 INFO L85 PathProgramCache]: Analyzing trace with hash -195699816, now seen corresponding path program 40 times [2022-03-20 19:16:04,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:04,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [666245931] [2022-03-20 19:16:04,862 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:16:04,862 INFO L85 PathProgramCache]: Analyzing trace with hash -1960895257, now seen corresponding path program 1 times [2022-03-20 19:16:04,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:16:04,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700532303] [2022-03-20 19:16:04,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:16:04,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:16:04,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:05,068 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:16:05,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:05,070 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:05,070 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:16:05,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700532303] [2022-03-20 19:16:05,071 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700532303] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:16:05,071 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:16:05,071 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:16:24,985 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:16:24,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [666245931] [2022-03-20 19:16:24,986 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [666245931] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:16:24,986 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:16:24,986 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-03-20 19:16:24,986 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203411582] [2022-03-20 19:16:24,986 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:16:24,986 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-03-20 19:16:24,986 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:24,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-03-20 19:16:24,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=923, Invalid=1333, Unknown=0, NotChecked=0, Total=2256 [2022-03-20 19:16:24,987 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand has 48 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:16:52,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:16:52,054 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2022-03-20 19:16:52,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-03-20 19:16:52,060 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2022-03-20 19:16:52,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:16:52,060 INFO L225 Difference]: With dead ends: 59 [2022-03-20 19:16:52,060 INFO L226 Difference]: Without dead ends: 54 [2022-03-20 19:16:52,061 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1266 ImplicationChecksByTransitivity, 46.7s TimeCoverageRelationStatistics Valid=2763, Invalid=5793, Unknown=0, NotChecked=0, Total=8556 [2022-03-20 19:16:52,061 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 19:16:52,062 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 36 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 19:16:52,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-20 19:16:52,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-03-20 19:16:52,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.0204081632653061) internal successors, (50), 49 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:16:52,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2022-03-20 19:16:52,064 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2022-03-20 19:16:52,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:16:52,065 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2022-03-20 19:16:52,065 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:16:52,065 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2022-03-20 19:16:52,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-03-20 19:16:52,065 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:16:52,065 INFO L499 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:16:52,065 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2022-03-20 19:16:52,065 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:16:52,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:16:52,066 INFO L85 PathProgramCache]: Analyzing trace with hash -1736338170, now seen corresponding path program 41 times [2022-03-20 19:16:52,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:16:52,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2032733321] [2022-03-20 19:16:52,357 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:16:52,358 INFO L85 PathProgramCache]: Analyzing trace with hash -1901789913, now seen corresponding path program 1 times [2022-03-20 19:16:52,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:16:52,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1992910604] [2022-03-20 19:16:52,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:16:52,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:16:52,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:52,596 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:16:52,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:16:52,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:16:52,612 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:16:52,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1992910604] [2022-03-20 19:16:52,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1992910604] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:16:52,612 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:16:52,612 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:17:24,701 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:17:24,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2032733321] [2022-03-20 19:17:24,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2032733321] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:17:24,701 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:17:24,701 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-03-20 19:17:24,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454198196] [2022-03-20 19:17:24,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:17:24,702 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-03-20 19:17:24,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:17:24,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-03-20 19:17:24,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=966, Invalid=1386, Unknown=0, NotChecked=0, Total=2352 [2022-03-20 19:17:24,702 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand has 49 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 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) [2022-03-20 19:18:00,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:18:00,377 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2022-03-20 19:18:00,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-03-20 19:18:00,383 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 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 [2022-03-20 19:18:00,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:18:00,383 INFO L225 Difference]: With dead ends: 60 [2022-03-20 19:18:00,383 INFO L226 Difference]: Without dead ends: 55 [2022-03-20 19:18:00,385 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1318 ImplicationChecksByTransitivity, 67.5s TimeCoverageRelationStatistics Valid=2892, Invalid=6038, Unknown=0, NotChecked=0, Total=8930 [2022-03-20 19:18:00,385 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 19:18:00,385 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 31 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 19:18:00,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-20 19:18:00,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-03-20 19:18:00,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:18:00,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2022-03-20 19:18:00,390 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2022-03-20 19:18:00,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:18:00,390 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2022-03-20 19:18:00,390 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 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) [2022-03-20 19:18:00,390 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2022-03-20 19:18:00,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-20 19:18:00,390 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:18:00,391 INFO L499 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:18:00,391 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2022-03-20 19:18:00,391 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:18:00,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:18:00,391 INFO L85 PathProgramCache]: Analyzing trace with hash 2043480408, now seen corresponding path program 42 times [2022-03-20 19:18:00,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:18:00,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [398560761] [2022-03-20 19:18:00,642 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:18:00,643 INFO L85 PathProgramCache]: Analyzing trace with hash -1842684569, now seen corresponding path program 1 times [2022-03-20 19:18:00,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:18:00,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805480605] [2022-03-20 19:18:00,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:18:00,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:18:00,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,879 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:18:00,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,887 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:18:00,888 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:18:00,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805480605] [2022-03-20 19:18:00,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [805480605] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:18:00,888 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:18:00,888 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:18:46,807 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:18:46,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [398560761] [2022-03-20 19:18:46,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [398560761] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:18:46,808 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:18:46,808 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-03-20 19:18:46,808 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678022182] [2022-03-20 19:18:46,808 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:18:46,808 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-03-20 19:18:46,808 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:18:46,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-03-20 19:18:46,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1010, Invalid=1440, Unknown=0, NotChecked=0, Total=2450 [2022-03-20 19:18:46,809 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand has 50 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 48 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:19:37,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:19:37,050 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2022-03-20 19:19:37,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-03-20 19:19:37,057 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 48 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2022-03-20 19:19:37,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:19:37,058 INFO L225 Difference]: With dead ends: 61 [2022-03-20 19:19:37,058 INFO L226 Difference]: Without dead ends: 56 [2022-03-20 19:19:37,059 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1371 ImplicationChecksByTransitivity, 95.8s TimeCoverageRelationStatistics Valid=3024, Invalid=6288, Unknown=0, NotChecked=0, Total=9312 [2022-03-20 19:19:37,059 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 19:19:37,059 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 36 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 19:19:37,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-03-20 19:19:37,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2022-03-20 19:19:37,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.0196078431372548) internal successors, (52), 51 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) [2022-03-20 19:19:37,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2022-03-20 19:19:37,063 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2022-03-20 19:19:37,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:19:37,063 INFO L478 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2022-03-20 19:19:37,064 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 48 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:19:37,064 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2022-03-20 19:19:37,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-03-20 19:19:37,064 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:19:37,064 INFO L499 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:19:37,064 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2022-03-20 19:19:37,064 INFO L403 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:19:37,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:19:37,065 INFO L85 PathProgramCache]: Analyzing trace with hash -1041227962, now seen corresponding path program 43 times [2022-03-20 19:19:37,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:19:37,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1684710939] [2022-03-20 19:19:37,910 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:19:37,911 INFO L85 PathProgramCache]: Analyzing trace with hash -1783579225, now seen corresponding path program 1 times [2022-03-20 19:19:37,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:19:37,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733888849] [2022-03-20 19:19:37,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:19:37,911 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:19:37,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:19:38,229 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:19:38,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:19:38,244 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:19:38,244 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:19:38,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733888849] [2022-03-20 19:19:38,244 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733888849] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:19:38,244 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:19:38,244 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:20:23,627 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:20:23,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1684710939] [2022-03-20 19:20:23,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1684710939] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:20:23,627 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:20:23,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-03-20 19:20:23,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952098642] [2022-03-20 19:20:23,627 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:20:23,627 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-03-20 19:20:23,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:20:23,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-03-20 19:20:23,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1055, Invalid=1495, Unknown=0, NotChecked=0, Total=2550 [2022-03-20 19:20:23,628 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand has 51 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 49 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:21:21,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:21:21,767 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2022-03-20 19:21:21,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-03-20 19:21:21,775 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 49 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2022-03-20 19:21:21,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:21:21,776 INFO L225 Difference]: With dead ends: 62 [2022-03-20 19:21:21,776 INFO L226 Difference]: Without dead ends: 57 [2022-03-20 19:21:21,777 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1425 ImplicationChecksByTransitivity, 103.2s TimeCoverageRelationStatistics Valid=3159, Invalid=6543, Unknown=0, NotChecked=0, Total=9702 [2022-03-20 19:21:21,778 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 19:21:21,778 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 21 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 19:21:21,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-20 19:21:21,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-03-20 19:21:21,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0192307692307692) internal successors, (53), 52 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) [2022-03-20 19:21:21,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2022-03-20 19:21:21,781 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2022-03-20 19:21:21,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:21:21,781 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2022-03-20 19:21:21,781 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 49 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:21:21,781 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2022-03-20 19:21:21,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-03-20 19:21:21,782 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:21:21,782 INFO L499 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:21:21,782 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2022-03-20 19:21:21,782 INFO L403 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:21:21,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:21:21,782 INFO L85 PathProgramCache]: Analyzing trace with hash 2117060376, now seen corresponding path program 44 times [2022-03-20 19:21:21,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:21:21,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1581040124] [2022-03-20 19:21:22,140 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:21:22,141 INFO L85 PathProgramCache]: Analyzing trace with hash -1724473881, now seen corresponding path program 1 times [2022-03-20 19:21:22,141 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:21:22,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534219623] [2022-03-20 19:21:22,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:21:22,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:21:22,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:21:22,506 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:21:22,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:21:22,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:21:22,511 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:21:22,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534219623] [2022-03-20 19:21:22,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1534219623] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:21:22,511 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:21:22,511 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:22:18,547 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:22:18,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1581040124] [2022-03-20 19:22:18,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1581040124] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:22:18,547 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:22:18,547 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-03-20 19:22:18,547 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466540274] [2022-03-20 19:22:18,547 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:22:18,547 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-03-20 19:22:18,547 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:22:18,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-03-20 19:22:18,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1101, Invalid=1551, Unknown=0, NotChecked=0, Total=2652 [2022-03-20 19:22:18,548 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand has 52 states, 50 states have (on average 1.04) internal successors, (52), 50 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) [2022-03-20 19:23:13,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:23:13,803 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2022-03-20 19:23:13,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-03-20 19:23:13,812 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 50 states have (on average 1.04) internal successors, (52), 50 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 [2022-03-20 19:23:13,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:23:13,812 INFO L225 Difference]: With dead ends: 63 [2022-03-20 19:23:13,812 INFO L226 Difference]: Without dead ends: 58 [2022-03-20 19:23:13,813 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1480 ImplicationChecksByTransitivity, 110.8s TimeCoverageRelationStatistics Valid=3297, Invalid=6803, Unknown=0, NotChecked=0, Total=10100 [2022-03-20 19:23:13,814 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 19:23:13,814 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 36 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 19:23:13,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-03-20 19:23:13,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2022-03-20 19:23:13,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0188679245283019) internal successors, (54), 53 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:23:13,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2022-03-20 19:23:13,819 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2022-03-20 19:23:13,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:23:13,819 INFO L478 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2022-03-20 19:23:13,819 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 50 states have (on average 1.04) internal successors, (52), 50 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) [2022-03-20 19:23:13,819 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2022-03-20 19:23:13,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-20 19:23:13,819 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:23:13,819 INFO L499 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:23:13,820 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2022-03-20 19:23:13,820 INFO L403 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:23:13,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:23:13,820 INFO L85 PathProgramCache]: Analyzing trace with hash 1239751046, now seen corresponding path program 45 times [2022-03-20 19:23:13,820 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:23:13,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1968833969] [2022-03-20 19:23:14,898 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:23:14,898 INFO L85 PathProgramCache]: Analyzing trace with hash -1665368537, now seen corresponding path program 1 times [2022-03-20 19:23:14,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:23:14,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532913558] [2022-03-20 19:23:14,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:23:14,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:23:14,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:23:15,285 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:23:15,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:23:15,287 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:23:15,287 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:23:15,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532913558] [2022-03-20 19:23:15,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532913558] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:23:15,288 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:23:15,288 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:24:22,008 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:24:22,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1968833969] [2022-03-20 19:24:22,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1968833969] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:24:22,009 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:24:22,009 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-03-20 19:24:22,009 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741416165] [2022-03-20 19:24:22,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:24:22,009 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-03-20 19:24:22,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:24:22,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-03-20 19:24:22,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1148, Invalid=1608, Unknown=0, NotChecked=0, Total=2756 [2022-03-20 19:24:22,010 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand has 53 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:25:30,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:25:30,865 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2022-03-20 19:25:30,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-03-20 19:25:30,873 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2022-03-20 19:25:30,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:25:30,874 INFO L225 Difference]: With dead ends: 64 [2022-03-20 19:25:30,874 INFO L226 Difference]: Without dead ends: 59 [2022-03-20 19:25:30,874 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1536 ImplicationChecksByTransitivity, 135.0s TimeCoverageRelationStatistics Valid=3438, Invalid=7068, Unknown=0, NotChecked=0, Total=10506 [2022-03-20 19:25:30,875 INFO L913 BasicCegarLoop]: 9 mSDtfsCounter, 13 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 19:25:30,875 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 41 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 19:25:30,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-03-20 19:25:30,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-03-20 19:25:30,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0185185185185186) internal successors, (55), 54 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:25:30,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2022-03-20 19:25:30,879 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2022-03-20 19:25:30,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:25:30,879 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2022-03-20 19:25:30,879 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:25:30,879 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2022-03-20 19:25:30,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-03-20 19:25:30,880 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:25:30,880 INFO L499 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:25:30,880 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2022-03-20 19:25:30,880 INFO L403 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:25:30,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:25:30,880 INFO L85 PathProgramCache]: Analyzing trace with hash -187034408, now seen corresponding path program 46 times [2022-03-20 19:25:30,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:25:30,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1009101955] [2022-03-20 19:25:31,927 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:25:31,928 INFO L85 PathProgramCache]: Analyzing trace with hash -1606263193, now seen corresponding path program 1 times [2022-03-20 19:25:31,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:25:31,928 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972158071] [2022-03-20 19:25:31,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:25:31,928 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:25:31,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:25:32,296 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:25:32,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:25:32,298 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:25:32,298 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:25:32,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972158071] [2022-03-20 19:25:32,298 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1972158071] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:25:32,298 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:25:32,298 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:26:43,326 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:26:43,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1009101955] [2022-03-20 19:26:43,327 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1009101955] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:26:43,327 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:26:43,327 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2022-03-20 19:26:43,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885181424] [2022-03-20 19:26:43,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:26:43,327 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-03-20 19:26:43,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:26:43,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-03-20 19:26:43,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1196, Invalid=1666, Unknown=0, NotChecked=0, Total=2862 [2022-03-20 19:26:43,328 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand has 54 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 52 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)