/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 10:29:16,315 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:29:16,320 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:29:16,371 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:29:16,371 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:29:16,380 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:29:16,384 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:29:16,388 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:29:16,392 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:29:16,396 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:29:16,398 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:29:16,399 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:29:16,399 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:29:16,402 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:29:16,406 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:29:16,408 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:29:16,410 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:29:16,412 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:29:16,413 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:29:16,424 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:29:16,427 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:29:16,428 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:29:16,430 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:29:16,431 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:29:16,443 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-21 10:29:16,454 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:29:16,455 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:29:16,456 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:29:16,457 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-21 10:29:16,486 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:29:16,487 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:29:16,488 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:29:16,488 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:29:16,489 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:29:16,489 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:29:16,489 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:29:16,489 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:29:16,489 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:29:16,490 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:29:16,490 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:29:16,490 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:29:16,490 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:29:16,490 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:29:16,491 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:29:16,491 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:29:16,491 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:29:16,491 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:29:16,492 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:29:16,492 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:29:16,492 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:29:16,492 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:29:16,493 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:29:16,493 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:29:16,493 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:29:16,493 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:29:16,493 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:29:16,494 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:29:16,494 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:29:16,494 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false [2020-09-21 10:29:16,963 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:29:16,992 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:29:16,998 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:29:17,002 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:29:17,003 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:29:17,005 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-09-21 10:29:17,106 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/649c00430/35eb9e3aa4c94a349258daa768667a0e/FLAG51e749faf [2020-09-21 10:29:17,668 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:29:17,669 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-09-21 10:29:17,676 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/649c00430/35eb9e3aa4c94a349258daa768667a0e/FLAG51e749faf [2020-09-21 10:29:18,001 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/649c00430/35eb9e3aa4c94a349258daa768667a0e [2020-09-21 10:29:18,016 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:29:18,025 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:29:18,028 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:29:18,029 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:29:18,033 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:29:18,034 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:29:18" (1/1) ... [2020-09-21 10:29:18,040 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@339faaff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:18, skipping insertion in model container [2020-09-21 10:29:18,040 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:29:18" (1/1) ... [2020-09-21 10:29:18,051 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:29:18,080 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:29:18,293 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:29:18,299 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:29:18,315 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:29:18,330 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:29:18,330 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:18 WrapperNode [2020-09-21 10:29:18,331 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:29:18,332 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:29:18,332 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:29:18,332 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:29:18,345 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:18" (1/1) ... [2020-09-21 10:29:18,346 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:18" (1/1) ... [2020-09-21 10:29:18,352 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:18" (1/1) ... [2020-09-21 10:29:18,352 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:18" (1/1) ... [2020-09-21 10:29:18,356 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:18" (1/1) ... [2020-09-21 10:29:18,361 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:18" (1/1) ... [2020-09-21 10:29:18,362 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:18" (1/1) ... [2020-09-21 10:29:18,439 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:29:18,440 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:29:18,440 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:29:18,440 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:29:18,443 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:18" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:29:18,529 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:29:18,529 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:29:18,529 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-21 10:29:18,529 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:29:18,530 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:29:18,530 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-21 10:29:18,531 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:29:18,531 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:29:18,531 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:29:18,721 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:29:18,721 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-21 10:29:18,726 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:29:18 BoogieIcfgContainer [2020-09-21 10:29:18,726 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:29:18,727 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:29:18,727 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:29:18,732 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:29:18,732 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:29:18" (1/3) ... [2020-09-21 10:29:18,733 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b82792a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:29:18, skipping insertion in model container [2020-09-21 10:29:18,733 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:18" (2/3) ... [2020-09-21 10:29:18,734 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b82792a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:29:18, skipping insertion in model container [2020-09-21 10:29:18,734 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:29:18" (3/3) ... [2020-09-21 10:29:18,737 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-09-21 10:29:18,749 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:29:18,761 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:29:18,784 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:29:18,814 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:29:18,814 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:29:18,815 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:29:18,815 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:29:18,815 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:29:18,815 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:29:18,815 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:29:18,816 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:29:18,839 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-09-21 10:29:18,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-09-21 10:29:18,846 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:18,848 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:18,848 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:18,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:18,855 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-09-21 10:29:18,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:18,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1767666609] [2020-09-21 10:29:18,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:18,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:19,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,117 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:19,118 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1767666609] [2020-09-21 10:29:19,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:29:19,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-21 10:29:19,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746394055] [2020-09-21 10:29:19,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-21 10:29:19,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:19,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-21 10:29:19,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 10:29:19,172 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-09-21 10:29:19,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:19,251 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-09-21 10:29:19,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 10:29:19,254 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-09-21 10:29:19,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:19,266 INFO L225 Difference]: With dead ends: 29 [2020-09-21 10:29:19,266 INFO L226 Difference]: Without dead ends: 12 [2020-09-21 10:29:19,271 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 10:29:19,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-09-21 10:29:19,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-09-21 10:29:19,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-09-21 10:29:19,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-09-21 10:29:19,326 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-09-21 10:29:19,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:19,327 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-09-21 10:29:19,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-21 10:29:19,327 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-09-21 10:29:19,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-09-21 10:29:19,328 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:19,328 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:19,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:29:19,329 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:19,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:19,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-09-21 10:29:19,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:19,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1981538730] [2020-09-21 10:29:19,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:19,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:19,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,487 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:19,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1981538730] [2020-09-21 10:29:19,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:19,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-09-21 10:29:19,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378582089] [2020-09-21 10:29:19,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:29:19,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:19,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:29:19,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:29:19,497 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-09-21 10:29:19,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:19,524 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-09-21 10:29:19,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 10:29:19,525 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-09-21 10:29:19,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:19,526 INFO L225 Difference]: With dead ends: 18 [2020-09-21 10:29:19,526 INFO L226 Difference]: Without dead ends: 13 [2020-09-21 10:29:19,527 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:29:19,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-09-21 10:29:19,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-09-21 10:29:19,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-09-21 10:29:19,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-09-21 10:29:19,533 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-09-21 10:29:19,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:19,534 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-09-21 10:29:19,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:29:19,534 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-09-21 10:29:19,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-09-21 10:29:19,535 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:19,535 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:19,535 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:29:19,535 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:19,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:19,536 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-09-21 10:29:19,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:19,537 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119522049] [2020-09-21 10:29:19,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:19,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:19,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,629 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:19,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119522049] [2020-09-21 10:29:19,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:19,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-21 10:29:19,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157223501] [2020-09-21 10:29:19,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:29:19,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:19,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:29:19,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:29:19,632 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-09-21 10:29:19,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:19,655 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-09-21 10:29:19,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:29:19,656 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-09-21 10:29:19,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:19,657 INFO L225 Difference]: With dead ends: 19 [2020-09-21 10:29:19,657 INFO L226 Difference]: Without dead ends: 14 [2020-09-21 10:29:19,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:29:19,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-09-21 10:29:19,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-09-21 10:29:19,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-09-21 10:29:19,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-09-21 10:29:19,664 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-09-21 10:29:19,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:19,664 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-09-21 10:29:19,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:29:19,665 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-09-21 10:29:19,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-09-21 10:29:19,665 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:19,665 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:19,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:29:19,666 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:19,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:19,667 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-09-21 10:29:19,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:19,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410743570] [2020-09-21 10:29:19,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:19,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:19,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,775 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:19,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410743570] [2020-09-21 10:29:19,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:19,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 10:29:19,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100927135] [2020-09-21 10:29:19,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:29:19,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:19,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:29:19,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:29:19,778 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-09-21 10:29:19,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:19,814 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-09-21 10:29:19,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:29:19,815 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-09-21 10:29:19,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:19,815 INFO L225 Difference]: With dead ends: 20 [2020-09-21 10:29:19,816 INFO L226 Difference]: Without dead ends: 15 [2020-09-21 10:29:19,816 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:29:19,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-09-21 10:29:19,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-09-21 10:29:19,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-09-21 10:29:19,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-09-21 10:29:19,822 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-09-21 10:29:19,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:19,822 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-09-21 10:29:19,822 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:29:19,823 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-09-21 10:29:19,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-09-21 10:29:19,823 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:19,824 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:19,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:29:19,824 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:19,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:19,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-09-21 10:29:19,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:19,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1183682479] [2020-09-21 10:29:19,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:19,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:19,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,939 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:19,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1183682479] [2020-09-21 10:29:19,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:19,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 10:29:19,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141753406] [2020-09-21 10:29:19,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:29:19,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:19,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:29:19,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:29:19,943 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-09-21 10:29:19,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:19,983 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-09-21 10:29:19,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 10:29:19,984 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-09-21 10:29:19,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:19,985 INFO L225 Difference]: With dead ends: 21 [2020-09-21 10:29:19,986 INFO L226 Difference]: Without dead ends: 16 [2020-09-21 10:29:19,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:29:19,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-09-21 10:29:19,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-09-21 10:29:19,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-09-21 10:29:19,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-09-21 10:29:19,993 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-09-21 10:29:19,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:19,993 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-09-21 10:29:19,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:29:19,994 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-09-21 10:29:19,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-09-21 10:29:19,994 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:19,995 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:19,995 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:29:19,995 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:19,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:19,996 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-09-21 10:29:19,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:19,996 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [429111688] [2020-09-21 10:29:19,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:20,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:20,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:20,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:20,160 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:20,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [429111688] [2020-09-21 10:29:20,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:20,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 10:29:20,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239372629] [2020-09-21 10:29:20,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:29:20,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:20,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:29:20,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:29:20,163 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-09-21 10:29:20,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:20,212 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-09-21 10:29:20,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 10:29:20,212 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-09-21 10:29:20,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:20,213 INFO L225 Difference]: With dead ends: 22 [2020-09-21 10:29:20,213 INFO L226 Difference]: Without dead ends: 17 [2020-09-21 10:29:20,214 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:29:20,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-09-21 10:29:20,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-09-21 10:29:20,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-09-21 10:29:20,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-09-21 10:29:20,220 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-09-21 10:29:20,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:20,220 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-09-21 10:29:20,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:29:20,220 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-09-21 10:29:20,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-21 10:29:20,221 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:20,221 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:20,222 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:29:20,222 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:20,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:20,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-09-21 10:29:20,223 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:20,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1244042288] [2020-09-21 10:29:20,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:20,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:20,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:20,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:20,400 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:20,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1244042288] [2020-09-21 10:29:20,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:20,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 10:29:20,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579466120] [2020-09-21 10:29:20,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 10:29:20,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:20,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 10:29:20,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:29:20,408 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-09-21 10:29:20,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:20,475 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-09-21 10:29:20,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-21 10:29:20,476 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-09-21 10:29:20,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:20,477 INFO L225 Difference]: With dead ends: 23 [2020-09-21 10:29:20,477 INFO L226 Difference]: Without dead ends: 18 [2020-09-21 10:29:20,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:29:20,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-09-21 10:29:20,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-09-21 10:29:20,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-09-21 10:29:20,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-09-21 10:29:20,483 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-09-21 10:29:20,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:20,483 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-09-21 10:29:20,484 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 10:29:20,484 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-09-21 10:29:20,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-21 10:29:20,484 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:20,485 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:20,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 10:29:20,485 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:20,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:20,486 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-09-21 10:29:20,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:20,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1910379443] [2020-09-21 10:29:20,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:20,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:20,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:20,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:20,647 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:20,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1910379443] [2020-09-21 10:29:20,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:20,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:29:20,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361806422] [2020-09-21 10:29:20,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:29:20,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:20,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:29:20,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:29:20,650 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-09-21 10:29:20,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:20,707 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-09-21 10:29:20,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:29:20,708 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-09-21 10:29:20,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:20,709 INFO L225 Difference]: With dead ends: 24 [2020-09-21 10:29:20,709 INFO L226 Difference]: Without dead ends: 19 [2020-09-21 10:29:20,710 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:29:20,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-09-21 10:29:20,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-09-21 10:29:20,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-09-21 10:29:20,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-09-21 10:29:20,715 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-09-21 10:29:20,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:20,716 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-09-21 10:29:20,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:29:20,716 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-09-21 10:29:20,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-09-21 10:29:20,717 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:20,717 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:20,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 10:29:20,718 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:20,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:20,718 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-09-21 10:29:20,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:20,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1278836273] [2020-09-21 10:29:20,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:20,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:20,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:20,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:20,903 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:20,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1278836273] [2020-09-21 10:29:20,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:20,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-21 10:29:20,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777394175] [2020-09-21 10:29:20,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-21 10:29:20,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:20,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-21 10:29:20,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:29:20,908 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-09-21 10:29:20,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:20,996 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-09-21 10:29:20,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-21 10:29:20,998 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-09-21 10:29:20,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:20,998 INFO L225 Difference]: With dead ends: 25 [2020-09-21 10:29:20,999 INFO L226 Difference]: Without dead ends: 20 [2020-09-21 10:29:20,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:29:21,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-09-21 10:29:21,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-09-21 10:29:21,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-09-21 10:29:21,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-09-21 10:29:21,008 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-09-21 10:29:21,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:21,009 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-09-21 10:29:21,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-21 10:29:21,009 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-09-21 10:29:21,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-21 10:29:21,014 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:21,014 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:21,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 10:29:21,015 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:21,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:21,015 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-09-21 10:29:21,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:21,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1761490050] [2020-09-21 10:29:21,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:21,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:21,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:21,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:21,301 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:21,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1761490050] [2020-09-21 10:29:21,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:21,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-21 10:29:21,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463558451] [2020-09-21 10:29:21,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-21 10:29:21,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:21,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-21 10:29:21,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:29:21,306 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-09-21 10:29:21,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:21,411 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-09-21 10:29:21,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-21 10:29:21,412 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-09-21 10:29:21,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:21,413 INFO L225 Difference]: With dead ends: 26 [2020-09-21 10:29:21,413 INFO L226 Difference]: Without dead ends: 21 [2020-09-21 10:29:21,414 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:29:21,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-09-21 10:29:21,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-09-21 10:29:21,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-09-21 10:29:21,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-09-21 10:29:21,427 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-09-21 10:29:21,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:21,427 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-09-21 10:29:21,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-21 10:29:21,428 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-09-21 10:29:21,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-09-21 10:29:21,428 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:21,429 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:21,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-21 10:29:21,429 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:21,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:21,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-09-21 10:29:21,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:21,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1464518445] [2020-09-21 10:29:21,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:21,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:21,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:21,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:21,665 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:21,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1464518445] [2020-09-21 10:29:21,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:21,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:29:21,666 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613108863] [2020-09-21 10:29:21,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:29:21,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:21,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:29:21,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:29:21,668 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-09-21 10:29:21,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:21,765 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-09-21 10:29:21,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-21 10:29:21,766 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-09-21 10:29:21,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:21,767 INFO L225 Difference]: With dead ends: 27 [2020-09-21 10:29:21,767 INFO L226 Difference]: Without dead ends: 22 [2020-09-21 10:29:21,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:29:21,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-09-21 10:29:21,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-09-21 10:29:21,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-09-21 10:29:21,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-09-21 10:29:21,773 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-09-21 10:29:21,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:21,773 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-09-21 10:29:21,773 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:29:21,774 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-09-21 10:29:21,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-09-21 10:29:21,774 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:21,774 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:21,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-21 10:29:21,775 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:21,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:21,775 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-09-21 10:29:21,776 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:21,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [135646459] [2020-09-21 10:29:21,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:21,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:21,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:21,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:21,988 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:21,988 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [135646459] [2020-09-21 10:29:21,988 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:21,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-21 10:29:21,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033913200] [2020-09-21 10:29:21,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-21 10:29:21,989 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:21,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-21 10:29:21,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:29:21,990 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-09-21 10:29:22,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:22,102 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-09-21 10:29:22,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-21 10:29:22,103 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-09-21 10:29:22,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:22,104 INFO L225 Difference]: With dead ends: 28 [2020-09-21 10:29:22,104 INFO L226 Difference]: Without dead ends: 23 [2020-09-21 10:29:22,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:29:22,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-09-21 10:29:22,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-09-21 10:29:22,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-09-21 10:29:22,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-09-21 10:29:22,109 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-09-21 10:29:22,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:22,110 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-09-21 10:29:22,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-21 10:29:22,110 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-09-21 10:29:22,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-21 10:29:22,111 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:22,111 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:22,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-21 10:29:22,112 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:22,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:22,112 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-09-21 10:29:22,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:22,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1028798388] [2020-09-21 10:29:22,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:22,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:22,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:22,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:22,343 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:22,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1028798388] [2020-09-21 10:29:22,344 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:22,344 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-21 10:29:22,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743481280] [2020-09-21 10:29:22,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-21 10:29:22,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:22,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-21 10:29:22,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:29:22,346 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-09-21 10:29:22,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:22,501 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-09-21 10:29:22,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-21 10:29:22,502 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-09-21 10:29:22,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:22,503 INFO L225 Difference]: With dead ends: 29 [2020-09-21 10:29:22,503 INFO L226 Difference]: Without dead ends: 24 [2020-09-21 10:29:22,504 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:29:22,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-09-21 10:29:22,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-09-21 10:29:22,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-09-21 10:29:22,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-09-21 10:29:22,510 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-09-21 10:29:22,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:22,510 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-09-21 10:29:22,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-21 10:29:22,511 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-09-21 10:29:22,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-09-21 10:29:22,512 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:22,512 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:22,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-21 10:29:22,512 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:22,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:22,513 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-09-21 10:29:22,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:22,514 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1768008730] [2020-09-21 10:29:22,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:22,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:22,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:22,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:22,763 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:22,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1768008730] [2020-09-21 10:29:22,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:22,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-09-21 10:29:22,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193631243] [2020-09-21 10:29:22,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-21 10:29:22,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:22,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-21 10:29:22,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:29:22,766 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-09-21 10:29:22,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:22,914 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-09-21 10:29:22,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-21 10:29:22,915 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-09-21 10:29:22,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:22,916 INFO L225 Difference]: With dead ends: 30 [2020-09-21 10:29:22,916 INFO L226 Difference]: Without dead ends: 25 [2020-09-21 10:29:22,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:29:22,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-09-21 10:29:22,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-09-21 10:29:22,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-09-21 10:29:22,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-09-21 10:29:22,921 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-09-21 10:29:22,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:22,922 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-09-21 10:29:22,922 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-21 10:29:22,922 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-09-21 10:29:22,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-21 10:29:22,923 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:22,923 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:22,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-21 10:29:22,923 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:22,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:22,924 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-09-21 10:29:22,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:22,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189494187] [2020-09-21 10:29:22,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:22,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:23,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:23,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:23,222 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:23,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1189494187] [2020-09-21 10:29:23,222 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:23,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-21 10:29:23,224 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660331723] [2020-09-21 10:29:23,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-21 10:29:23,225 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:23,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-21 10:29:23,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:29:23,225 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-09-21 10:29:23,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:23,393 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-09-21 10:29:23,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-09-21 10:29:23,395 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-09-21 10:29:23,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:23,395 INFO L225 Difference]: With dead ends: 31 [2020-09-21 10:29:23,395 INFO L226 Difference]: Without dead ends: 26 [2020-09-21 10:29:23,396 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:29:23,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-09-21 10:29:23,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-09-21 10:29:23,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-09-21 10:29:23,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-09-21 10:29:23,403 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-09-21 10:29:23,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:23,405 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-09-21 10:29:23,405 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-21 10:29:23,405 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-09-21 10:29:23,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-09-21 10:29:23,408 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:23,408 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:23,408 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-21 10:29:23,408 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:23,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:23,409 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-09-21 10:29:23,410 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:23,410 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [781562247] [2020-09-21 10:29:23,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:23,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:23,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:23,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:23,709 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:23,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [781562247] [2020-09-21 10:29:23,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:23,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-09-21 10:29:23,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407076183] [2020-09-21 10:29:23,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-21 10:29:23,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:23,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-21 10:29:23,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:29:23,712 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-09-21 10:29:23,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:23,893 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-09-21 10:29:23,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-21 10:29:23,895 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-09-21 10:29:23,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:23,895 INFO L225 Difference]: With dead ends: 32 [2020-09-21 10:29:23,895 INFO L226 Difference]: Without dead ends: 27 [2020-09-21 10:29:23,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:29:23,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-09-21 10:29:23,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-09-21 10:29:23,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-09-21 10:29:23,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-09-21 10:29:23,902 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-09-21 10:29:23,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:23,902 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-09-21 10:29:23,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-21 10:29:23,902 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-09-21 10:29:23,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-21 10:29:23,905 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:23,905 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:23,905 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-21 10:29:23,905 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:23,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:23,906 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-09-21 10:29:23,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:23,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1815021253] [2020-09-21 10:29:23,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:23,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:24,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:24,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:24,281 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:24,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1815021253] [2020-09-21 10:29:24,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:24,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-09-21 10:29:24,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17509447] [2020-09-21 10:29:24,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-21 10:29:24,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:24,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-21 10:29:24,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:29:24,285 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-09-21 10:29:24,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:24,486 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-09-21 10:29:24,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-21 10:29:24,487 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-09-21 10:29:24,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:24,487 INFO L225 Difference]: With dead ends: 33 [2020-09-21 10:29:24,488 INFO L226 Difference]: Without dead ends: 28 [2020-09-21 10:29:24,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:29:24,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-09-21 10:29:24,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-09-21 10:29:24,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-09-21 10:29:24,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-09-21 10:29:24,493 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-09-21 10:29:24,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:24,493 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-09-21 10:29:24,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-21 10:29:24,494 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-09-21 10:29:24,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-09-21 10:29:24,495 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:24,495 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:24,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-21 10:29:24,495 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:24,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:24,496 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-09-21 10:29:24,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:24,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [147992216] [2020-09-21 10:29:24,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:24,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:24,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:24,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:24,898 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:24,899 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [147992216] [2020-09-21 10:29:24,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:24,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-09-21 10:29:24,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234648661] [2020-09-21 10:29:24,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-09-21 10:29:24,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:24,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-09-21 10:29:24,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:29:24,901 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-09-21 10:29:25,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:25,129 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-09-21 10:29:25,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-09-21 10:29:25,132 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-09-21 10:29:25,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:25,132 INFO L225 Difference]: With dead ends: 34 [2020-09-21 10:29:25,132 INFO L226 Difference]: Without dead ends: 29 [2020-09-21 10:29:25,133 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:29:25,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-09-21 10:29:25,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-09-21 10:29:25,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-09-21 10:29:25,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-09-21 10:29:25,138 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-09-21 10:29:25,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:25,139 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-09-21 10:29:25,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-09-21 10:29:25,139 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-09-21 10:29:25,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:29:25,140 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:25,140 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:25,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-09-21 10:29:25,140 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:25,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:25,141 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-09-21 10:29:25,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:25,141 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [114390057] [2020-09-21 10:29:25,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:25,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:25,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:25,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:25,577 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:25,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [114390057] [2020-09-21 10:29:25,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:25,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-21 10:29:25,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598956382] [2020-09-21 10:29:25,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-21 10:29:25,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:25,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-21 10:29:25,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:29:25,580 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-09-21 10:29:25,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:25,857 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-09-21 10:29:25,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-21 10:29:25,857 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-09-21 10:29:25,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:25,858 INFO L225 Difference]: With dead ends: 35 [2020-09-21 10:29:25,858 INFO L226 Difference]: Without dead ends: 30 [2020-09-21 10:29:25,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:29:25,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-21 10:29:25,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-09-21 10:29:25,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-09-21 10:29:25,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-09-21 10:29:25,864 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-09-21 10:29:25,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:25,864 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-09-21 10:29:25,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-21 10:29:25,864 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-09-21 10:29:25,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-21 10:29:25,865 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:25,865 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:25,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-09-21 10:29:25,865 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:25,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:25,866 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-09-21 10:29:25,866 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:25,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [886855378] [2020-09-21 10:29:25,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:25,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:26,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:26,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:26,296 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:26,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [886855378] [2020-09-21 10:29:26,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:26,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-09-21 10:29:26,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280716102] [2020-09-21 10:29:26,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-09-21 10:29:26,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:26,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-09-21 10:29:26,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:29:26,299 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-09-21 10:29:26,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:26,571 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-09-21 10:29:26,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-21 10:29:26,571 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-09-21 10:29:26,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:26,572 INFO L225 Difference]: With dead ends: 36 [2020-09-21 10:29:26,572 INFO L226 Difference]: Without dead ends: 31 [2020-09-21 10:29:26,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:29:26,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-21 10:29:26,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-09-21 10:29:26,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-21 10:29:26,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-09-21 10:29:26,580 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-09-21 10:29:26,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:26,580 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-09-21 10:29:26,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-09-21 10:29:26,580 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-09-21 10:29:26,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-09-21 10:29:26,581 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:26,581 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:26,581 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-09-21 10:29:26,582 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:26,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:26,584 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-09-21 10:29:26,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:26,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1038465600] [2020-09-21 10:29:26,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:26,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:27,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:27,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:27,042 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:27,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1038465600] [2020-09-21 10:29:27,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:27,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-09-21 10:29:27,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018045949] [2020-09-21 10:29:27,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-09-21 10:29:27,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:27,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-09-21 10:29:27,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:29:27,045 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-09-21 10:29:27,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:27,322 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-09-21 10:29:27,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-09-21 10:29:27,323 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-09-21 10:29:27,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:27,323 INFO L225 Difference]: With dead ends: 37 [2020-09-21 10:29:27,323 INFO L226 Difference]: Without dead ends: 32 [2020-09-21 10:29:27,324 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:29:27,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-09-21 10:29:27,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-09-21 10:29:27,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-21 10:29:27,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-09-21 10:29:27,333 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-09-21 10:29:27,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:27,333 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-09-21 10:29:27,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-09-21 10:29:27,334 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-09-21 10:29:27,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-21 10:29:27,334 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:27,334 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:27,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-09-21 10:29:27,338 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:27,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:27,339 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-09-21 10:29:27,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:27,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2015478134] [2020-09-21 10:29:27,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:27,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:27,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:27,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:27,944 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:27,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2015478134] [2020-09-21 10:29:27,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:27,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-09-21 10:29:27,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602748060] [2020-09-21 10:29:27,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-09-21 10:29:27,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:27,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-09-21 10:29:27,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:29:27,949 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-09-21 10:29:28,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:28,265 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-09-21 10:29:28,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-09-21 10:29:28,268 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-09-21 10:29:28,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:28,268 INFO L225 Difference]: With dead ends: 38 [2020-09-21 10:29:28,269 INFO L226 Difference]: Without dead ends: 33 [2020-09-21 10:29:28,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:29:28,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-09-21 10:29:28,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-09-21 10:29:28,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-09-21 10:29:28,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-09-21 10:29:28,280 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-09-21 10:29:28,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:28,281 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-09-21 10:29:28,281 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-09-21 10:29:28,281 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-09-21 10:29:28,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-09-21 10:29:28,282 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:28,282 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:28,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-09-21 10:29:28,282 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:28,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:28,283 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-09-21 10:29:28,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:28,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [351837283] [2020-09-21 10:29:28,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:28,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:28,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:28,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:28,854 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:28,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [351837283] [2020-09-21 10:29:28,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:28,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-09-21 10:29:28,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843292158] [2020-09-21 10:29:28,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-09-21 10:29:28,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:28,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-09-21 10:29:28,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:29:28,857 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-09-21 10:29:29,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:29,223 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-09-21 10:29:29,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-09-21 10:29:29,224 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-09-21 10:29:29,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:29,224 INFO L225 Difference]: With dead ends: 39 [2020-09-21 10:29:29,224 INFO L226 Difference]: Without dead ends: 34 [2020-09-21 10:29:29,225 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:29:29,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-21 10:29:29,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-09-21 10:29:29,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-09-21 10:29:29,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-09-21 10:29:29,230 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-09-21 10:29:29,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:29,230 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-09-21 10:29:29,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-09-21 10:29:29,231 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-09-21 10:29:29,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-21 10:29:29,231 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:29,232 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:29,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-09-21 10:29:29,232 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:29,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:29,232 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-09-21 10:29:29,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:29,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1214049968] [2020-09-21 10:29:29,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:29,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:29,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:29,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:29,779 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:29,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1214049968] [2020-09-21 10:29:29,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:29,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-09-21 10:29:29,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870496249] [2020-09-21 10:29:29,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-09-21 10:29:29,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:29,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-09-21 10:29:29,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-09-21 10:29:29,782 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-09-21 10:29:30,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:30,248 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-09-21 10:29:30,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-09-21 10:29:30,249 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-09-21 10:29:30,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:30,250 INFO L225 Difference]: With dead ends: 40 [2020-09-21 10:29:30,250 INFO L226 Difference]: Without dead ends: 35 [2020-09-21 10:29:30,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-09-21 10:29:30,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-09-21 10:29:30,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-09-21 10:29:30,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-09-21 10:29:30,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-09-21 10:29:30,259 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-09-21 10:29:30,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:30,259 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-09-21 10:29:30,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-09-21 10:29:30,260 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-09-21 10:29:30,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-21 10:29:30,260 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:30,260 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:30,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-09-21 10:29:30,264 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:30,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:30,264 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-09-21 10:29:30,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:30,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1484844733] [2020-09-21 10:29:30,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:30,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:30,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:30,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:30,899 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:30,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1484844733] [2020-09-21 10:29:30,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:30,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-09-21 10:29:30,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192155895] [2020-09-21 10:29:30,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-09-21 10:29:30,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:30,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-09-21 10:29:30,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:29:30,901 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-09-21 10:29:31,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:31,342 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-09-21 10:29:31,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-09-21 10:29:31,343 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-09-21 10:29:31,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:31,343 INFO L225 Difference]: With dead ends: 41 [2020-09-21 10:29:31,344 INFO L226 Difference]: Without dead ends: 36 [2020-09-21 10:29:31,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:29:31,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-09-21 10:29:31,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-09-21 10:29:31,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-09-21 10:29:31,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-09-21 10:29:31,349 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-09-21 10:29:31,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:31,349 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-09-21 10:29:31,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-09-21 10:29:31,349 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-09-21 10:29:31,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-09-21 10:29:31,350 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:31,350 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:31,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-09-21 10:29:31,351 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:31,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:31,351 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-09-21 10:29:31,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:31,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1614421284] [2020-09-21 10:29:31,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:31,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:32,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:32,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:32,056 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:32,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1614421284] [2020-09-21 10:29:32,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:32,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-09-21 10:29:32,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348667400] [2020-09-21 10:29:32,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-09-21 10:29:32,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:32,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-09-21 10:29:32,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-09-21 10:29:32,058 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-09-21 10:29:32,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:32,574 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-09-21 10:29:32,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-09-21 10:29:32,575 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-09-21 10:29:32,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:32,575 INFO L225 Difference]: With dead ends: 42 [2020-09-21 10:29:32,576 INFO L226 Difference]: Without dead ends: 37 [2020-09-21 10:29:32,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-09-21 10:29:32,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-09-21 10:29:32,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-09-21 10:29:32,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-21 10:29:32,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-09-21 10:29:32,588 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-09-21 10:29:32,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:32,588 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-09-21 10:29:32,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-09-21 10:29:32,588 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-09-21 10:29:32,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-21 10:29:32,589 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:32,589 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:32,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-09-21 10:29:32,590 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:32,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:32,590 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-09-21 10:29:32,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:32,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [826585867] [2020-09-21 10:29:32,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:32,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:33,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:33,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:33,316 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:33,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [826585867] [2020-09-21 10:29:33,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:33,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-09-21 10:29:33,317 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844859879] [2020-09-21 10:29:33,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-21 10:29:33,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:33,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-21 10:29:33,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:29:33,318 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-09-21 10:29:33,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:33,877 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-09-21 10:29:33,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-09-21 10:29:33,878 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-09-21 10:29:33,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:33,878 INFO L225 Difference]: With dead ends: 43 [2020-09-21 10:29:33,879 INFO L226 Difference]: Without dead ends: 38 [2020-09-21 10:29:33,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:29:33,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-09-21 10:29:33,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-09-21 10:29:33,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-09-21 10:29:33,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-09-21 10:29:33,884 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-09-21 10:29:33,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:33,885 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-09-21 10:29:33,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-21 10:29:33,885 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-09-21 10:29:33,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-09-21 10:29:33,892 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:33,892 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:33,893 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-09-21 10:29:33,893 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:33,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:33,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-09-21 10:29:33,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:33,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1278829554] [2020-09-21 10:29:33,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:33,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:34,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:34,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:34,648 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:34,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1278829554] [2020-09-21 10:29:34,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:34,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-09-21 10:29:34,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105517698] [2020-09-21 10:29:34,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-09-21 10:29:34,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:34,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-09-21 10:29:34,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-09-21 10:29:34,651 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-09-21 10:29:35,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:35,258 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-09-21 10:29:35,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-09-21 10:29:35,258 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-09-21 10:29:35,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:35,259 INFO L225 Difference]: With dead ends: 44 [2020-09-21 10:29:35,259 INFO L226 Difference]: Without dead ends: 39 [2020-09-21 10:29:35,260 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-09-21 10:29:35,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-09-21 10:29:35,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-09-21 10:29:35,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-09-21 10:29:35,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-09-21 10:29:35,264 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-09-21 10:29:35,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:35,264 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-09-21 10:29:35,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-09-21 10:29:35,265 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-09-21 10:29:35,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-09-21 10:29:35,265 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:35,265 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:35,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-09-21 10:29:35,265 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:35,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:35,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-09-21 10:29:35,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:35,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [273114706] [2020-09-21 10:29:35,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:35,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:36,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:36,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:36,114 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:36,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [273114706] [2020-09-21 10:29:36,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:36,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-09-21 10:29:36,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725187956] [2020-09-21 10:29:36,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-09-21 10:29:36,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:36,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-09-21 10:29:36,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:29:36,116 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-09-21 10:29:36,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:36,687 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-09-21 10:29:36,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-09-21 10:29:36,688 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-09-21 10:29:36,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:36,688 INFO L225 Difference]: With dead ends: 45 [2020-09-21 10:29:36,689 INFO L226 Difference]: Without dead ends: 40 [2020-09-21 10:29:36,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:29:36,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-09-21 10:29:36,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-09-21 10:29:36,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-09-21 10:29:36,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-09-21 10:29:36,695 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-09-21 10:29:36,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:36,695 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-09-21 10:29:36,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-09-21 10:29:36,696 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-09-21 10:29:36,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-09-21 10:29:36,696 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:36,696 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:36,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-09-21 10:29:36,697 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:36,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:36,697 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-09-21 10:29:36,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:36,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1411638351] [2020-09-21 10:29:36,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:36,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:37,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:37,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:37,524 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:37,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1411638351] [2020-09-21 10:29:37,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:37,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-09-21 10:29:37,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363589740] [2020-09-21 10:29:37,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-09-21 10:29:37,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:37,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-09-21 10:29:37,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-09-21 10:29:37,526 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-09-21 10:29:38,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:38,268 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-09-21 10:29:38,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-09-21 10:29:38,269 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-09-21 10:29:38,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:38,270 INFO L225 Difference]: With dead ends: 46 [2020-09-21 10:29:38,270 INFO L226 Difference]: Without dead ends: 41 [2020-09-21 10:29:38,271 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-09-21 10:29:38,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-09-21 10:29:38,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-09-21 10:29:38,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-21 10:29:38,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-09-21 10:29:38,277 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-09-21 10:29:38,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:38,278 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-09-21 10:29:38,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-09-21 10:29:38,278 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-09-21 10:29:38,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-09-21 10:29:38,278 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:38,279 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:38,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-09-21 10:29:38,279 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:38,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:38,279 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-09-21 10:29:38,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:38,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1431990620] [2020-09-21 10:29:38,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:38,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:39,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:39,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:39,101 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:39,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1431990620] [2020-09-21 10:29:39,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:39,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-09-21 10:29:39,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575719187] [2020-09-21 10:29:39,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-09-21 10:29:39,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:39,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-09-21 10:29:39,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:29:39,104 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-09-21 10:29:39,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:39,794 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-09-21 10:29:39,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-09-21 10:29:39,796 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-09-21 10:29:39,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:39,796 INFO L225 Difference]: With dead ends: 47 [2020-09-21 10:29:39,797 INFO L226 Difference]: Without dead ends: 42 [2020-09-21 10:29:39,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:29:39,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-09-21 10:29:39,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-09-21 10:29:39,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-21 10:29:39,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-09-21 10:29:39,801 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-09-21 10:29:39,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:39,801 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-09-21 10:29:39,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-09-21 10:29:39,802 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-09-21 10:29:39,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-21 10:29:39,802 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:39,802 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:39,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-09-21 10:29:39,803 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:39,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:39,803 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-09-21 10:29:39,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:39,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162529595] [2020-09-21 10:29:39,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:39,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:40,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:40,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:40,771 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:40,771 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162529595] [2020-09-21 10:29:40,771 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:40,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-09-21 10:29:40,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142203112] [2020-09-21 10:29:40,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-09-21 10:29:40,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:40,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-09-21 10:29:40,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 10:29:40,773 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-09-21 10:29:41,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:41,558 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-09-21 10:29:41,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-09-21 10:29:41,559 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-09-21 10:29:41,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:41,560 INFO L225 Difference]: With dead ends: 48 [2020-09-21 10:29:41,560 INFO L226 Difference]: Without dead ends: 43 [2020-09-21 10:29:41,561 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 10:29:41,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-09-21 10:29:41,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-09-21 10:29:41,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-09-21 10:29:41,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-09-21 10:29:41,565 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-09-21 10:29:41,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:41,565 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-09-21 10:29:41,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-09-21 10:29:41,565 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-09-21 10:29:41,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-21 10:29:41,565 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:41,565 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:41,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-09-21 10:29:41,566 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:41,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:41,566 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-09-21 10:29:41,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:41,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785725914] [2020-09-21 10:29:41,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:41,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:42,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:42,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:42,618 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:42,618 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785725914] [2020-09-21 10:29:42,618 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:42,619 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-09-21 10:29:42,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603848739] [2020-09-21 10:29:42,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-09-21 10:29:42,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:42,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-09-21 10:29:42,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:29:42,620 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-09-21 10:29:43,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:43,466 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-09-21 10:29:43,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-09-21 10:29:43,466 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-09-21 10:29:43,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:43,467 INFO L225 Difference]: With dead ends: 49 [2020-09-21 10:29:43,467 INFO L226 Difference]: Without dead ends: 44 [2020-09-21 10:29:43,468 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:29:43,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-21 10:29:43,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-09-21 10:29:43,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-09-21 10:29:43,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-09-21 10:29:43,472 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-09-21 10:29:43,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:43,472 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-09-21 10:29:43,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-09-21 10:29:43,473 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-09-21 10:29:43,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-09-21 10:29:43,473 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:43,473 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:43,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-09-21 10:29:43,474 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:43,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:43,474 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-09-21 10:29:43,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:43,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [281245485] [2020-09-21 10:29:43,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:43,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:44,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:44,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:44,469 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:44,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [281245485] [2020-09-21 10:29:44,469 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:44,469 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-09-21 10:29:44,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538882596] [2020-09-21 10:29:44,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-09-21 10:29:44,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:44,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-09-21 10:29:44,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:29:44,471 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-09-21 10:29:45,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:45,346 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-09-21 10:29:45,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-09-21 10:29:45,347 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-09-21 10:29:45,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:45,347 INFO L225 Difference]: With dead ends: 50 [2020-09-21 10:29:45,347 INFO L226 Difference]: Without dead ends: 45 [2020-09-21 10:29:45,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:29:45,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-09-21 10:29:45,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-09-21 10:29:45,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-09-21 10:29:45,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-09-21 10:29:45,352 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-09-21 10:29:45,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:45,352 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-09-21 10:29:45,353 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-09-21 10:29:45,353 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-09-21 10:29:45,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-09-21 10:29:45,353 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:45,353 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:45,353 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-09-21 10:29:45,354 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:45,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:45,354 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-09-21 10:29:45,354 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:45,354 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1524544583] [2020-09-21 10:29:45,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:45,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:46,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:46,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:46,529 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:46,530 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1524544583] [2020-09-21 10:29:46,530 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:46,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-09-21 10:29:46,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020606576] [2020-09-21 10:29:46,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-09-21 10:29:46,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:46,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-09-21 10:29:46,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-09-21 10:29:46,532 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-09-21 10:29:47,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:47,486 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-09-21 10:29:47,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-09-21 10:29:47,486 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-09-21 10:29:47,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:47,487 INFO L225 Difference]: With dead ends: 51 [2020-09-21 10:29:47,487 INFO L226 Difference]: Without dead ends: 46 [2020-09-21 10:29:47,489 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-09-21 10:29:47,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-09-21 10:29:47,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-09-21 10:29:47,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-09-21 10:29:47,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-09-21 10:29:47,496 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-09-21 10:29:47,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:47,496 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-09-21 10:29:47,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-09-21 10:29:47,496 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-09-21 10:29:47,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-09-21 10:29:47,496 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:47,497 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:47,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-09-21 10:29:47,499 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:47,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:47,499 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-09-21 10:29:47,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:47,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1827014734] [2020-09-21 10:29:47,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:47,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:48,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:48,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:48,703 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:48,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1827014734] [2020-09-21 10:29:48,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:48,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-09-21 10:29:48,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351066482] [2020-09-21 10:29:48,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-09-21 10:29:48,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:48,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-09-21 10:29:48,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-09-21 10:29:48,705 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-09-21 10:29:49,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:49,684 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-09-21 10:29:49,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-09-21 10:29:49,684 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-09-21 10:29:49,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:49,685 INFO L225 Difference]: With dead ends: 52 [2020-09-21 10:29:49,685 INFO L226 Difference]: Without dead ends: 47 [2020-09-21 10:29:49,686 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-09-21 10:29:49,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-09-21 10:29:49,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-09-21 10:29:49,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-09-21 10:29:49,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-09-21 10:29:49,690 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-09-21 10:29:49,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:49,690 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-09-21 10:29:49,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-09-21 10:29:49,690 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-09-21 10:29:49,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-09-21 10:29:49,691 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:49,691 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:49,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-09-21 10:29:49,691 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:49,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:49,692 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-09-21 10:29:49,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:49,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748542742] [2020-09-21 10:29:49,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:49,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:50,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,961 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:50,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [748542742] [2020-09-21 10:29:50,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:50,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-09-21 10:29:50,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886724004] [2020-09-21 10:29:50,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-09-21 10:29:50,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:50,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-09-21 10:29:50,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-09-21 10:29:50,964 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-09-21 10:29:52,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:52,020 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-09-21 10:29:52,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-09-21 10:29:52,021 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-09-21 10:29:52,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:52,022 INFO L225 Difference]: With dead ends: 53 [2020-09-21 10:29:52,022 INFO L226 Difference]: Without dead ends: 48 [2020-09-21 10:29:52,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-09-21 10:29:52,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-09-21 10:29:52,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-09-21 10:29:52,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-09-21 10:29:52,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-09-21 10:29:52,025 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-09-21 10:29:52,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:52,025 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-09-21 10:29:52,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-09-21 10:29:52,026 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-09-21 10:29:52,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-09-21 10:29:52,026 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:52,026 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:52,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-09-21 10:29:52,027 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:52,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:52,027 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-09-21 10:29:52,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:52,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [266416455] [2020-09-21 10:29:52,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:52,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:53,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:53,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:53,488 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:53,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [266416455] [2020-09-21 10:29:53,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:53,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-09-21 10:29:53,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524947962] [2020-09-21 10:29:53,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-09-21 10:29:53,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:53,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-09-21 10:29:53,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-09-21 10:29:53,493 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-09-21 10:29:54,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:54,502 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-09-21 10:29:54,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-09-21 10:29:54,503 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-09-21 10:29:54,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:54,503 INFO L225 Difference]: With dead ends: 54 [2020-09-21 10:29:54,503 INFO L226 Difference]: Without dead ends: 49 [2020-09-21 10:29:54,504 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-09-21 10:29:54,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-09-21 10:29:54,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-09-21 10:29:54,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-09-21 10:29:54,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-09-21 10:29:54,509 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-09-21 10:29:54,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:54,509 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-09-21 10:29:54,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-09-21 10:29:54,510 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-09-21 10:29:54,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-21 10:29:54,510 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:54,510 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:54,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-09-21 10:29:54,511 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:54,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:54,511 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-09-21 10:29:54,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:54,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [201105942] [2020-09-21 10:29:54,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:54,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:55,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:55,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:55,893 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:55,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [201105942] [2020-09-21 10:29:55,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:55,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-09-21 10:29:55,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280204903] [2020-09-21 10:29:55,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-09-21 10:29:55,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:55,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-09-21 10:29:55,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-09-21 10:29:55,895 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-09-21 10:29:57,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:57,076 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-09-21 10:29:57,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-09-21 10:29:57,076 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-09-21 10:29:57,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:57,077 INFO L225 Difference]: With dead ends: 55 [2020-09-21 10:29:57,077 INFO L226 Difference]: Without dead ends: 50 [2020-09-21 10:29:57,078 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-09-21 10:29:57,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-09-21 10:29:57,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-09-21 10:29:57,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-09-21 10:29:57,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-09-21 10:29:57,082 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-09-21 10:29:57,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:57,083 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-09-21 10:29:57,083 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-09-21 10:29:57,083 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-09-21 10:29:57,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-09-21 10:29:57,083 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:57,084 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:57,084 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-09-21 10:29:57,084 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:57,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:57,084 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-09-21 10:29:57,084 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:57,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [211196857] [2020-09-21 10:29:57,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:57,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:58,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:58,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:58,609 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:58,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [211196857] [2020-09-21 10:29:58,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:58,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-09-21 10:29:58,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700457673] [2020-09-21 10:29:58,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-09-21 10:29:58,610 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:58,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-09-21 10:29:58,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-09-21 10:29:58,611 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-09-21 10:29:59,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:59,851 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-09-21 10:29:59,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-09-21 10:29:59,852 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-09-21 10:29:59,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:59,852 INFO L225 Difference]: With dead ends: 56 [2020-09-21 10:29:59,853 INFO L226 Difference]: Without dead ends: 51 [2020-09-21 10:29:59,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-09-21 10:29:59,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-09-21 10:29:59,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-09-21 10:29:59,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-09-21 10:29:59,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-09-21 10:29:59,857 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-09-21 10:29:59,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:59,858 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-09-21 10:29:59,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-09-21 10:29:59,858 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-09-21 10:29:59,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-09-21 10:29:59,858 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:59,859 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:59,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-09-21 10:29:59,859 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:59,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:59,859 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-09-21 10:29:59,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:59,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227067552] [2020-09-21 10:29:59,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:59,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:01,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:01,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:01,259 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:01,260 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227067552] [2020-09-21 10:30:01,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:01,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-09-21 10:30:01,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893753398] [2020-09-21 10:30:01,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-09-21 10:30:01,260 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:01,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-09-21 10:30:01,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-09-21 10:30:01,262 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-09-21 10:30:02,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:02,596 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-09-21 10:30:02,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-09-21 10:30:02,597 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-09-21 10:30:02,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:02,597 INFO L225 Difference]: With dead ends: 57 [2020-09-21 10:30:02,598 INFO L226 Difference]: Without dead ends: 52 [2020-09-21 10:30:02,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-09-21 10:30:02,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-09-21 10:30:02,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-09-21 10:30:02,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-09-21 10:30:02,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-09-21 10:30:02,604 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-09-21 10:30:02,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:02,605 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-09-21 10:30:02,605 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-09-21 10:30:02,605 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-09-21 10:30:02,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-09-21 10:30:02,606 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:02,606 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:02,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-09-21 10:30:02,606 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:02,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:02,607 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-09-21 10:30:02,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:02,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [109009623] [2020-09-21 10:30:02,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:02,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:04,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:04,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:04,168 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:04,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [109009623] [2020-09-21 10:30:04,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:04,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-09-21 10:30:04,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018199020] [2020-09-21 10:30:04,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-09-21 10:30:04,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:04,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-09-21 10:30:04,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-09-21 10:30:04,170 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-09-21 10:30:05,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:05,629 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-09-21 10:30:05,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-09-21 10:30:05,630 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-09-21 10:30:05,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:05,631 INFO L225 Difference]: With dead ends: 58 [2020-09-21 10:30:05,631 INFO L226 Difference]: Without dead ends: 53 [2020-09-21 10:30:05,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-09-21 10:30:05,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-09-21 10:30:05,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-09-21 10:30:05,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-09-21 10:30:05,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-09-21 10:30:05,636 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-09-21 10:30:05,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:05,636 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-09-21 10:30:05,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-09-21 10:30:05,636 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-09-21 10:30:05,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-09-21 10:30:05,637 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:05,637 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:05,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-09-21 10:30:05,637 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:05,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:05,638 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-09-21 10:30:05,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:05,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1324953139] [2020-09-21 10:30:05,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:05,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:07,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:07,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:07,372 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:07,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1324953139] [2020-09-21 10:30:07,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:07,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-09-21 10:30:07,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375838750] [2020-09-21 10:30:07,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-09-21 10:30:07,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:07,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-09-21 10:30:07,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-09-21 10:30:07,374 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-09-21 10:30:08,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:08,921 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-09-21 10:30:08,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-09-21 10:30:08,923 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-09-21 10:30:08,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:08,923 INFO L225 Difference]: With dead ends: 59 [2020-09-21 10:30:08,923 INFO L226 Difference]: Without dead ends: 54 [2020-09-21 10:30:08,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-09-21 10:30:08,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-09-21 10:30:08,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-09-21 10:30:08,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-09-21 10:30:08,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-09-21 10:30:08,928 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-09-21 10:30:08,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:08,929 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-09-21 10:30:08,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-09-21 10:30:08,929 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-09-21 10:30:08,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-09-21 10:30:08,929 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:08,929 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:08,930 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-09-21 10:30:08,930 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:08,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:08,930 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-09-21 10:30:08,930 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:08,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [334468846] [2020-09-21 10:30:08,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:08,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:10,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:10,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:10,627 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:10,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [334468846] [2020-09-21 10:30:10,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:10,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-09-21 10:30:10,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698121139] [2020-09-21 10:30:10,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-09-21 10:30:10,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:10,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-09-21 10:30:10,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-09-21 10:30:10,629 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-09-21 10:30:12,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:12,232 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-09-21 10:30:12,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-09-21 10:30:12,233 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-09-21 10:30:12,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:12,234 INFO L225 Difference]: With dead ends: 60 [2020-09-21 10:30:12,234 INFO L226 Difference]: Without dead ends: 55 [2020-09-21 10:30:12,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-09-21 10:30:12,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-09-21 10:30:12,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-09-21 10:30:12,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-09-21 10:30:12,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-09-21 10:30:12,238 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-09-21 10:30:12,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:12,239 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-09-21 10:30:12,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-09-21 10:30:12,239 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-09-21 10:30:12,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-09-21 10:30:12,239 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:12,239 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:12,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-09-21 10:30:12,239 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:12,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:12,240 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-09-21 10:30:12,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:12,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2091519785] [2020-09-21 10:30:12,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:12,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:14,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:14,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:14,138 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:14,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2091519785] [2020-09-21 10:30:14,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:14,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-09-21 10:30:14,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329891157] [2020-09-21 10:30:14,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-09-21 10:30:14,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:14,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-09-21 10:30:14,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-09-21 10:30:14,139 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states.