/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 true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 22:49:56,954 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 22:49:56,958 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 22:49:57,000 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 22:49:57,000 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 22:49:57,001 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 22:49:57,006 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 22:49:57,008 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 22:49:57,009 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 22:49:57,010 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 22:49:57,011 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 22:49:57,013 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 22:49:57,013 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 22:49:57,014 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 22:49:57,015 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 22:49:57,016 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 22:49:57,017 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 22:49:57,018 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 22:49:57,019 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 22:49:57,021 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 22:49:57,022 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 22:49:57,023 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 22:49:57,025 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 22:49:57,025 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 22:49:57,028 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 22:49:57,035 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 22:49:57,036 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 22:49:57,037 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 22:49:57,038 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 [2020-08-18 22:49:57,060 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 22:49:57,060 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 22:49:57,061 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 22:49:57,062 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 22:49:57,062 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 22:49:57,062 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 22:49:57,062 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 22:49:57,062 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 22:49:57,063 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 22:49:57,063 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 22:49:57,063 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 22:49:57,063 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 22:49:57,063 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 22:49:57,064 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 22:49:57,064 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 22:49:57,064 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 22:49:57,064 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 22:49:57,064 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 22:49:57,065 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 22:49:57,065 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 22:49:57,065 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 22:49:57,065 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:49:57,065 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 22:49:57,066 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 22:49:57,066 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 22:49:57,066 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 22:49:57,066 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 22:49:57,066 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 22:49:57,067 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 22:49:57,067 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 -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDEST; [2020-08-18 22:49:57,388 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 22:49:57,401 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 22:49:57,404 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 22:49:57,406 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 22:49:57,406 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 22:49:57,407 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-18 22:49:57,469 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6d5e6ca0d/263f0ad7955c4c24bc0c9da5bac3bfa4/FLAGaa49109c4 [2020-08-18 22:49:57,907 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 22:49:57,907 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-18 22:49:57,912 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6d5e6ca0d/263f0ad7955c4c24bc0c9da5bac3bfa4/FLAGaa49109c4 [2020-08-18 22:49:58,312 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6d5e6ca0d/263f0ad7955c4c24bc0c9da5bac3bfa4 [2020-08-18 22:49:58,323 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 22:49:58,325 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 22:49:58,326 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 22:49:58,326 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 22:49:58,330 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 22:49:58,331 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:49:58" (1/1) ... [2020-08-18 22:49:58,334 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b23df30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:49:58, skipping insertion in model container [2020-08-18 22:49:58,334 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:49:58" (1/1) ... [2020-08-18 22:49:58,343 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 22:49:58,360 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 22:49:58,550 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:49:58,557 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 22:49:58,580 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:49:58,595 INFO L208 MainTranslator]: Completed translation [2020-08-18 22:49:58,596 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:49:58 WrapperNode [2020-08-18 22:49:58,596 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 22:49:58,597 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 22:49:58,597 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 22:49:58,598 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 22:49:58,683 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:49:58" (1/1) ... [2020-08-18 22:49:58,685 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:49:58" (1/1) ... [2020-08-18 22:49:58,693 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:49:58" (1/1) ... [2020-08-18 22:49:58,693 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:49:58" (1/1) ... [2020-08-18 22:49:58,701 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:49:58" (1/1) ... [2020-08-18 22:49:58,711 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:49:58" (1/1) ... [2020-08-18 22:49:58,712 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:49:58" (1/1) ... [2020-08-18 22:49:58,715 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 22:49:58,716 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 22:49:58,716 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 22:49:58,716 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 22:49:58,717 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:49:58" (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 [2020-08-18 22:49:58,777 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 22:49:58,777 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 22:49:58,777 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 22:49:58,777 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-18 22:49:58,777 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 22:49:58,777 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 22:49:58,778 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 22:49:58,778 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 22:49:58,778 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-18 22:49:58,778 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 22:49:58,778 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 22:49:58,778 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 22:49:58,779 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 22:49:58,779 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 22:49:58,779 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 22:49:58,779 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 22:49:58,779 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 22:49:58,780 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 22:49:59,018 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 22:49:59,019 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 22:49:59,023 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:49:59 BoogieIcfgContainer [2020-08-18 22:49:59,023 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 22:49:59,028 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 22:49:59,031 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 22:49:59,042 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 22:49:59,042 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:49:58" (1/3) ... [2020-08-18 22:49:59,044 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19173a42 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:49:59, skipping insertion in model container [2020-08-18 22:49:59,044 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:49:58" (2/3) ... [2020-08-18 22:49:59,045 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19173a42 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:49:59, skipping insertion in model container [2020-08-18 22:49:59,048 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:49:59" (3/3) ... [2020-08-18 22:49:59,051 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-18 22:49:59,068 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 22:49:59,087 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 22:49:59,109 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 22:49:59,142 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 22:49:59,142 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 22:49:59,142 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 22:49:59,142 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 22:49:59,143 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 22:49:59,143 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 22:49:59,143 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 22:49:59,143 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 22:49:59,160 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-18 22:49:59,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 22:49:59,167 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:49:59,168 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:49:59,169 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:49:59,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:49:59,175 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-18 22:49:59,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:49:59,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179203336] [2020-08-18 22:49:59,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:49:59,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:49:59,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:49:59,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:49:59,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:49:59,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:49:59,422 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:49:59,424 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179203336] [2020-08-18 22:49:59,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:49:59,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 22:49:59,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473310589] [2020-08-18 22:49:59,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 22:49:59,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:49:59,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 22:49:59,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:49:59,451 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-18 22:49:59,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:49:59,613 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-18 22:49:59,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 22:49:59,616 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 22:49:59,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:49:59,645 INFO L225 Difference]: With dead ends: 59 [2020-08-18 22:49:59,646 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 22:49:59,652 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:49:59,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 22:49:59,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 22:49:59,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 22:49:59,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-18 22:49:59,721 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-18 22:49:59,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:49:59,723 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-18 22:49:59,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 22:49:59,723 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-18 22:49:59,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 22:49:59,725 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:49:59,726 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:49:59,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 22:49:59,726 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:49:59,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:49:59,727 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-18 22:49:59,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:49:59,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1821453883] [2020-08-18 22:49:59,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:49:59,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:49:59,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:49:59,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:49:59,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:49:59,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:49:59,905 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:49:59,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1821453883] [2020-08-18 22:49:59,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:49:59,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 22:49:59,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943082390] [2020-08-18 22:49:59,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 22:49:59,909 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:49:59,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 22:49:59,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:49:59,910 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-18 22:50:00,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:00,131 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-18 22:50:00,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 22:50:00,131 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-18 22:50:00,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:00,133 INFO L225 Difference]: With dead ends: 48 [2020-08-18 22:50:00,133 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 22:50:00,135 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:50:00,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 22:50:00,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 22:50:00,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 22:50:00,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-18 22:50:00,144 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-18 22:50:00,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:00,144 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-18 22:50:00,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 22:50:00,145 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-18 22:50:00,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 22:50:00,146 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:00,146 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:00,147 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 22:50:00,147 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:00,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:00,147 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-18 22:50:00,148 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:00,148 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [253154841] [2020-08-18 22:50:00,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:00,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:00,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:00,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:00,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:00,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:00,362 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:00,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [253154841] [2020-08-18 22:50:00,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:00,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 22:50:00,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663577439] [2020-08-18 22:50:00,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 22:50:00,365 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:00,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 22:50:00,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:50:00,365 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-18 22:50:00,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:00,552 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-18 22:50:00,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 22:50:00,553 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-18 22:50:00,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:00,554 INFO L225 Difference]: With dead ends: 50 [2020-08-18 22:50:00,554 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 22:50:00,555 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:50:00,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 22:50:00,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 22:50:00,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 22:50:00,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-18 22:50:00,562 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-18 22:50:00,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:00,562 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-18 22:50:00,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 22:50:00,562 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-18 22:50:00,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 22:50:00,563 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:00,563 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:00,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 22:50:00,564 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:00,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:00,564 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-18 22:50:00,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:00,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1994468133] [2020-08-18 22:50:00,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:00,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:00,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:00,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:00,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:00,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:00,802 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:00,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1994468133] [2020-08-18 22:50:00,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:00,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 22:50:00,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137121548] [2020-08-18 22:50:00,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 22:50:00,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:00,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 22:50:00,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:50:00,805 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-18 22:50:01,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:01,002 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-18 22:50:01,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 22:50:01,003 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-18 22:50:01,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:01,004 INFO L225 Difference]: With dead ends: 52 [2020-08-18 22:50:01,005 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 22:50:01,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:50:01,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 22:50:01,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 22:50:01,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 22:50:01,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-18 22:50:01,013 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-18 22:50:01,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:01,013 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-18 22:50:01,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 22:50:01,014 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-18 22:50:01,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 22:50:01,015 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:01,015 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:01,016 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 22:50:01,016 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:01,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:01,017 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-18 22:50:01,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:01,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1665836446] [2020-08-18 22:50:01,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:01,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:01,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:01,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:01,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:01,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:01,281 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:01,281 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1665836446] [2020-08-18 22:50:01,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:01,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 22:50:01,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785568535] [2020-08-18 22:50:01,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 22:50:01,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:01,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 22:50:01,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:50:01,284 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-18 22:50:01,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:01,528 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-18 22:50:01,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 22:50:01,529 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-18 22:50:01,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:01,530 INFO L225 Difference]: With dead ends: 54 [2020-08-18 22:50:01,530 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 22:50:01,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:50:01,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 22:50:01,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 22:50:01,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 22:50:01,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-18 22:50:01,537 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-18 22:50:01,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:01,537 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-18 22:50:01,537 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 22:50:01,538 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-18 22:50:01,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 22:50:01,539 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:01,539 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:01,539 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 22:50:01,539 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:01,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:01,540 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-18 22:50:01,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:01,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [50019699] [2020-08-18 22:50:01,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:01,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:01,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:01,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:01,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:01,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:01,782 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:01,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [50019699] [2020-08-18 22:50:01,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:01,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 22:50:01,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532673258] [2020-08-18 22:50:01,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 22:50:01,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:01,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 22:50:01,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:50:01,785 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-18 22:50:01,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:01,967 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-18 22:50:01,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 22:50:01,968 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-18 22:50:01,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:01,969 INFO L225 Difference]: With dead ends: 56 [2020-08-18 22:50:01,969 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 22:50:01,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:50:01,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 22:50:01,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 22:50:01,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 22:50:01,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-18 22:50:01,976 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-18 22:50:01,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:01,976 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-18 22:50:01,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 22:50:01,976 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-18 22:50:01,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 22:50:01,977 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:01,977 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:01,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 22:50:01,978 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:01,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:01,978 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-18 22:50:01,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:01,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237618968] [2020-08-18 22:50:01,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:01,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:02,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:02,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:02,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:02,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:02,233 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:02,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237618968] [2020-08-18 22:50:02,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:02,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 22:50:02,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988479316] [2020-08-18 22:50:02,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 22:50:02,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:02,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 22:50:02,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:50:02,248 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-18 22:50:02,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:02,468 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-18 22:50:02,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 22:50:02,468 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 22:50:02,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:02,469 INFO L225 Difference]: With dead ends: 58 [2020-08-18 22:50:02,469 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 22:50:02,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:50:02,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 22:50:02,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 22:50:02,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 22:50:02,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 22:50:02,480 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-18 22:50:02,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:02,482 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 22:50:02,482 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 22:50:02,483 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 22:50:02,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 22:50:02,486 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:02,486 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:02,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 22:50:02,487 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:02,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:02,487 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-18 22:50:02,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:02,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [723708543] [2020-08-18 22:50:02,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:02,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:02,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:02,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:02,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:02,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:02,807 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:02,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [723708543] [2020-08-18 22:50:02,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:02,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 22:50:02,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991612939] [2020-08-18 22:50:02,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 22:50:02,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:02,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 22:50:02,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:50:02,809 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-18 22:50:03,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:03,023 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-18 22:50:03,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 22:50:03,024 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-18 22:50:03,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:03,025 INFO L225 Difference]: With dead ends: 60 [2020-08-18 22:50:03,025 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 22:50:03,026 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:50:03,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 22:50:03,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 22:50:03,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 22:50:03,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 22:50:03,036 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-18 22:50:03,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:03,036 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 22:50:03,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 22:50:03,037 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 22:50:03,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 22:50:03,037 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:03,037 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:03,038 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 22:50:03,038 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:03,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:03,038 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-18 22:50:03,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:03,039 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1819714754] [2020-08-18 22:50:03,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:03,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:03,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:03,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:03,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:03,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:03,377 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:03,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1819714754] [2020-08-18 22:50:03,378 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:03,378 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 22:50:03,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417909450] [2020-08-18 22:50:03,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 22:50:03,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:03,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 22:50:03,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:50:03,384 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-18 22:50:03,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:03,564 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-18 22:50:03,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 22:50:03,565 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-18 22:50:03,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:03,566 INFO L225 Difference]: With dead ends: 62 [2020-08-18 22:50:03,566 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 22:50:03,567 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:50:03,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 22:50:03,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 22:50:03,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 22:50:03,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-18 22:50:03,573 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-18 22:50:03,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:03,573 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-18 22:50:03,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 22:50:03,573 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-18 22:50:03,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 22:50:03,574 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:03,574 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:03,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 22:50:03,575 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:03,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:03,575 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-18 22:50:03,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:03,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105819885] [2020-08-18 22:50:03,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:03,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:03,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:03,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:03,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:03,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:03,991 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:03,992 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105819885] [2020-08-18 22:50:03,992 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:03,992 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 22:50:03,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739437173] [2020-08-18 22:50:03,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 22:50:03,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:03,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 22:50:03,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:50:03,994 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-18 22:50:04,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:04,274 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-18 22:50:04,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 22:50:04,274 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 22:50:04,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:04,275 INFO L225 Difference]: With dead ends: 64 [2020-08-18 22:50:04,275 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 22:50:04,276 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:50:04,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 22:50:04,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 22:50:04,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 22:50:04,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-18 22:50:04,281 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-18 22:50:04,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:04,281 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-18 22:50:04,281 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 22:50:04,281 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-18 22:50:04,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 22:50:04,282 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:04,282 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:04,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 22:50:04,283 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:04,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:04,283 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-18 22:50:04,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:04,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698567939] [2020-08-18 22:50:04,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:04,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:04,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:04,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:04,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:04,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:04,342 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 22:50:04,343 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698567939] [2020-08-18 22:50:04,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:50:04,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 22:50:04,344 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478976911] [2020-08-18 22:50:04,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 22:50:04,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:04,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 22:50:04,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:50:04,345 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-18 22:50:04,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:04,456 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-18 22:50:04,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 22:50:04,457 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-18 22:50:04,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:04,460 INFO L225 Difference]: With dead ends: 65 [2020-08-18 22:50:04,460 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 22:50:04,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:50:04,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 22:50:04,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-18 22:50:04,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 22:50:04,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-18 22:50:04,478 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-18 22:50:04,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:04,479 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-18 22:50:04,479 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 22:50:04,479 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-18 22:50:04,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 22:50:04,480 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:04,480 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:04,480 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 22:50:04,480 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:04,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:04,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-18 22:50:04,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:04,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1345317762] [2020-08-18 22:50:04,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:04,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:04,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:04,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:04,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:04,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:04,550 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 22:50:04,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1345317762] [2020-08-18 22:50:04,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:04,551 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 22:50:04,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896052104] [2020-08-18 22:50:04,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 22:50:04,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:04,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 22:50:04,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:50:04,553 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-18 22:50:04,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:04,665 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-18 22:50:04,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:50:04,665 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-18 22:50:04,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:04,666 INFO L225 Difference]: With dead ends: 73 [2020-08-18 22:50:04,666 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 22:50:04,667 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:50:04,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 22:50:04,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-18 22:50:04,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 22:50:04,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-18 22:50:04,673 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-18 22:50:04,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:04,673 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-18 22:50:04,673 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 22:50:04,674 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-18 22:50:04,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 22:50:04,674 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:04,675 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:04,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 22:50:04,675 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:04,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:04,675 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-18 22:50:04,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:04,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280190118] [2020-08-18 22:50:04,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:04,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:04,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:04,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:04,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:04,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:04,776 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-18 22:50:04,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280190118] [2020-08-18 22:50:04,777 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:50:04,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 22:50:04,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711720199] [2020-08-18 22:50:04,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 22:50:04,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:04,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 22:50:04,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:50:04,781 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-18 22:50:04,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:04,865 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-18 22:50:04,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 22:50:04,866 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-18 22:50:04,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:04,868 INFO L225 Difference]: With dead ends: 69 [2020-08-18 22:50:04,870 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 22:50:04,871 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:50:04,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 22:50:04,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 22:50:04,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 22:50:04,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-18 22:50:04,883 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-18 22:50:04,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:04,883 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-18 22:50:04,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 22:50:04,884 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-18 22:50:04,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 22:50:04,885 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:04,885 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:04,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 22:50:04,885 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:04,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:04,886 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-18 22:50:04,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:04,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [662874003] [2020-08-18 22:50:04,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:04,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:04,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:04,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:04,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:04,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:05,426 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:05,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [662874003] [2020-08-18 22:50:05,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:05,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 22:50:05,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724141875] [2020-08-18 22:50:05,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 22:50:05,427 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:05,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 22:50:05,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:50:05,428 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-18 22:50:05,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:05,665 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-18 22:50:05,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 22:50:05,665 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-18 22:50:05,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:05,666 INFO L225 Difference]: With dead ends: 74 [2020-08-18 22:50:05,666 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 22:50:05,667 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:50:05,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 22:50:05,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 22:50:05,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 22:50:05,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-18 22:50:05,686 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-18 22:50:05,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:05,686 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-18 22:50:05,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 22:50:05,686 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-18 22:50:05,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 22:50:05,687 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:05,688 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:05,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 22:50:05,693 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:05,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:05,694 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-18 22:50:05,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:05,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352437] [2020-08-18 22:50:05,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:05,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:05,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:05,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:05,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:05,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:06,203 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:06,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352437] [2020-08-18 22:50:06,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:06,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 22:50:06,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355454904] [2020-08-18 22:50:06,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 22:50:06,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:06,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 22:50:06,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:50:06,206 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-18 22:50:06,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:06,498 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-18 22:50:06,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 22:50:06,499 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-18 22:50:06,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:06,500 INFO L225 Difference]: With dead ends: 76 [2020-08-18 22:50:06,500 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 22:50:06,500 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-18 22:50:06,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 22:50:06,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 22:50:06,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 22:50:06,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-18 22:50:06,506 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-18 22:50:06,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:06,507 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-18 22:50:06,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 22:50:06,507 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-18 22:50:06,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 22:50:06,508 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:06,508 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:06,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 22:50:06,509 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:06,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:06,509 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-18 22:50:06,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:06,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2135929654] [2020-08-18 22:50:06,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:06,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:06,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:06,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:06,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:06,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:07,087 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:07,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2135929654] [2020-08-18 22:50:07,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:07,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 22:50:07,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970959955] [2020-08-18 22:50:07,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 22:50:07,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:07,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 22:50:07,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:50:07,090 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-18 22:50:07,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:07,340 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-18 22:50:07,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 22:50:07,340 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 22:50:07,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:07,341 INFO L225 Difference]: With dead ends: 78 [2020-08-18 22:50:07,341 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 22:50:07,342 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:50:07,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 22:50:07,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 22:50:07,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 22:50:07,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-18 22:50:07,348 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-18 22:50:07,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:07,348 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-18 22:50:07,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 22:50:07,348 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-18 22:50:07,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 22:50:07,349 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:07,349 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:07,349 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 22:50:07,350 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:07,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:07,350 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-18 22:50:07,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:07,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792877245] [2020-08-18 22:50:07,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:07,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:07,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:07,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:07,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:07,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:07,971 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:07,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792877245] [2020-08-18 22:50:07,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:07,972 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 22:50:07,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244198876] [2020-08-18 22:50:07,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 22:50:07,973 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:07,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 22:50:07,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:50:07,973 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-18 22:50:08,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:08,243 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-18 22:50:08,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 22:50:08,244 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-18 22:50:08,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:08,245 INFO L225 Difference]: With dead ends: 80 [2020-08-18 22:50:08,245 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 22:50:08,246 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-18 22:50:08,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 22:50:08,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 22:50:08,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 22:50:08,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-18 22:50:08,252 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-18 22:50:08,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:08,252 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-18 22:50:08,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 22:50:08,252 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-18 22:50:08,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 22:50:08,253 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:08,253 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:08,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 22:50:08,253 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:08,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:08,254 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-18 22:50:08,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:08,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517687362] [2020-08-18 22:50:08,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:08,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:08,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:08,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:08,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:08,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:09,054 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:09,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517687362] [2020-08-18 22:50:09,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:09,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 22:50:09,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204676531] [2020-08-18 22:50:09,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 22:50:09,062 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:09,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 22:50:09,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-18 22:50:09,064 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-18 22:50:09,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:09,377 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-18 22:50:09,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 22:50:09,378 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-18 22:50:09,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:09,378 INFO L225 Difference]: With dead ends: 82 [2020-08-18 22:50:09,379 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 22:50:09,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-18 22:50:09,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 22:50:09,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 22:50:09,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 22:50:09,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-18 22:50:09,393 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-18 22:50:09,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:09,394 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-18 22:50:09,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 22:50:09,394 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-18 22:50:09,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 22:50:09,395 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:09,395 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:09,395 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 22:50:09,396 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:09,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:09,396 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-18 22:50:09,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:09,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [581226766] [2020-08-18 22:50:09,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:09,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:09,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:09,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:09,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:09,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:10,105 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:10,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [581226766] [2020-08-18 22:50:10,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:10,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 22:50:10,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869910287] [2020-08-18 22:50:10,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 22:50:10,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:10,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 22:50:10,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:50:10,107 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-18 22:50:10,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:10,386 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-18 22:50:10,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 22:50:10,390 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-18 22:50:10,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:10,391 INFO L225 Difference]: With dead ends: 84 [2020-08-18 22:50:10,391 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 22:50:10,392 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:50:10,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 22:50:10,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 22:50:10,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 22:50:10,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-18 22:50:10,400 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-18 22:50:10,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:10,400 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-18 22:50:10,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 22:50:10,400 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-18 22:50:10,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 22:50:10,405 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:10,405 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:10,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 22:50:10,405 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:10,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:10,406 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-18 22:50:10,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:10,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [538712068] [2020-08-18 22:50:10,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:10,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:10,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:10,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:10,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:10,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:11,154 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:11,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [538712068] [2020-08-18 22:50:11,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:11,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 22:50:11,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618179637] [2020-08-18 22:50:11,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 22:50:11,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:11,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 22:50:11,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-18 22:50:11,157 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-18 22:50:11,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:11,372 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-18 22:50:11,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 22:50:11,373 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-18 22:50:11,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:11,374 INFO L225 Difference]: With dead ends: 86 [2020-08-18 22:50:11,374 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 22:50:11,375 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:50:11,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 22:50:11,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 22:50:11,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 22:50:11,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-18 22:50:11,380 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-18 22:50:11,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:11,380 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-18 22:50:11,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 22:50:11,380 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-18 22:50:11,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 22:50:11,381 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:11,381 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:11,381 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 22:50:11,382 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:11,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:11,382 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-18 22:50:11,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:11,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [146535415] [2020-08-18 22:50:11,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:11,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:11,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:11,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:11,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:11,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:12,460 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:12,461 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [146535415] [2020-08-18 22:50:12,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:12,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 22:50:12,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732625012] [2020-08-18 22:50:12,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 22:50:12,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:12,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 22:50:12,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-18 22:50:12,467 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-18 22:50:12,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:12,951 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-18 22:50:12,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 22:50:12,952 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-18 22:50:12,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:12,953 INFO L225 Difference]: With dead ends: 88 [2020-08-18 22:50:12,953 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 22:50:12,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:50:12,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 22:50:12,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 22:50:12,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 22:50:12,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-18 22:50:12,962 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-18 22:50:12,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:12,963 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-18 22:50:12,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 22:50:12,963 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-18 22:50:12,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 22:50:12,965 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:12,965 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:12,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 22:50:12,965 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:12,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:12,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-18 22:50:12,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:12,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1487753754] [2020-08-18 22:50:12,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:12,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:13,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:13,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:13,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:13,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:13,928 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:13,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1487753754] [2020-08-18 22:50:13,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:13,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 22:50:13,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833577635] [2020-08-18 22:50:13,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 22:50:13,929 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:13,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 22:50:13,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:50:13,930 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-18 22:50:14,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:14,253 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-18 22:50:14,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 22:50:14,256 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-18 22:50:14,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:14,257 INFO L225 Difference]: With dead ends: 90 [2020-08-18 22:50:14,257 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 22:50:14,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-18 22:50:14,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 22:50:14,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 22:50:14,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 22:50:14,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-18 22:50:14,262 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-18 22:50:14,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:14,262 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-18 22:50:14,263 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 22:50:14,265 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-18 22:50:14,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 22:50:14,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:14,266 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:14,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 22:50:14,266 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:14,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:14,267 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-18 22:50:14,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:14,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [307319607] [2020-08-18 22:50:14,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:14,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:14,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:14,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:14,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:14,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:15,218 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:15,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [307319607] [2020-08-18 22:50:15,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:15,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 22:50:15,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921036440] [2020-08-18 22:50:15,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 22:50:15,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:15,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 22:50:15,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:50:15,221 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-18 22:50:15,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:15,528 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-18 22:50:15,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 22:50:15,528 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-18 22:50:15,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:15,529 INFO L225 Difference]: With dead ends: 92 [2020-08-18 22:50:15,529 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 22:50:15,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-18 22:50:15,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 22:50:15,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 22:50:15,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 22:50:15,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-18 22:50:15,534 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-18 22:50:15,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:15,534 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-18 22:50:15,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 22:50:15,534 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-18 22:50:15,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 22:50:15,535 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:15,535 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:15,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 22:50:15,536 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:15,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:15,536 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-18 22:50:15,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:15,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1115201331] [2020-08-18 22:50:15,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:15,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:15,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:15,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:15,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:15,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:16,502 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:16,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1115201331] [2020-08-18 22:50:16,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:16,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 22:50:16,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13561016] [2020-08-18 22:50:16,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 22:50:16,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:16,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 22:50:16,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:50:16,504 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-18 22:50:16,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:16,889 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-18 22:50:16,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 22:50:16,890 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-18 22:50:16,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:16,891 INFO L225 Difference]: With dead ends: 94 [2020-08-18 22:50:16,891 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 22:50:16,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-18 22:50:16,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 22:50:16,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 22:50:16,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 22:50:16,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-18 22:50:16,897 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-18 22:50:16,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:16,897 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-18 22:50:16,897 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 22:50:16,897 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-18 22:50:16,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 22:50:16,898 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:16,898 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:16,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 22:50:16,898 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:16,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:16,899 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-18 22:50:16,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:16,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [97417131] [2020-08-18 22:50:16,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:16,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:16,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:16,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:16,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:16,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:18,098 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:18,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [97417131] [2020-08-18 22:50:18,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:18,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 22:50:18,099 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102331627] [2020-08-18 22:50:18,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 22:50:18,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:18,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 22:50:18,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-18 22:50:18,122 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-18 22:50:18,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:18,477 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-18 22:50:18,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 22:50:18,478 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-18 22:50:18,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:18,478 INFO L225 Difference]: With dead ends: 96 [2020-08-18 22:50:18,479 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 22:50:18,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-18 22:50:18,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 22:50:18,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 22:50:18,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 22:50:18,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-18 22:50:18,484 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-18 22:50:18,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:18,484 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-18 22:50:18,484 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 22:50:18,484 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-18 22:50:18,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 22:50:18,485 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:18,485 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:18,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 22:50:18,485 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:18,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:18,486 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-18 22:50:18,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:18,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [704174803] [2020-08-18 22:50:18,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:18,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:18,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:18,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:18,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:18,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:19,629 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:19,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [704174803] [2020-08-18 22:50:19,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:19,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 22:50:19,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954280436] [2020-08-18 22:50:19,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 22:50:19,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:19,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 22:50:19,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-18 22:50:19,635 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-18 22:50:19,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:19,888 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-18 22:50:19,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 22:50:19,889 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-18 22:50:19,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:19,890 INFO L225 Difference]: With dead ends: 98 [2020-08-18 22:50:19,890 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 22:50:19,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-18 22:50:19,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 22:50:19,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 22:50:19,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 22:50:19,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-18 22:50:19,895 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-18 22:50:19,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:19,895 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-18 22:50:19,896 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 22:50:19,896 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-18 22:50:19,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 22:50:19,896 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:19,896 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:19,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 22:50:19,897 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:19,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:19,897 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-18 22:50:19,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:19,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517423610] [2020-08-18 22:50:19,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:19,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:19,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:19,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:19,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:19,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:21,080 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:21,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517423610] [2020-08-18 22:50:21,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:21,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 22:50:21,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797711919] [2020-08-18 22:50:21,081 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 22:50:21,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:21,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 22:50:21,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-18 22:50:21,082 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-18 22:50:21,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:21,430 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-18 22:50:21,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 22:50:21,430 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-18 22:50:21,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:21,431 INFO L225 Difference]: With dead ends: 100 [2020-08-18 22:50:21,431 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 22:50:21,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:50:21,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 22:50:21,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 22:50:21,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 22:50:21,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-18 22:50:21,437 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-18 22:50:21,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:21,437 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-18 22:50:21,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 22:50:21,437 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-18 22:50:21,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 22:50:21,438 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:21,438 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:21,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 22:50:21,438 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:21,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:21,439 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-18 22:50:21,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:21,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653846773] [2020-08-18 22:50:21,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:21,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:21,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:21,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:21,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:21,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:22,750 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:22,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653846773] [2020-08-18 22:50:22,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:22,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 22:50:22,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283205558] [2020-08-18 22:50:22,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 22:50:22,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:22,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 22:50:22,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-18 22:50:22,752 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-18 22:50:23,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:23,156 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-18 22:50:23,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 22:50:23,156 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-18 22:50:23,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:23,157 INFO L225 Difference]: With dead ends: 102 [2020-08-18 22:50:23,158 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 22:50:23,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-18 22:50:23,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 22:50:23,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 22:50:23,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 22:50:23,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-18 22:50:23,164 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-18 22:50:23,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:23,164 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-18 22:50:23,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 22:50:23,164 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-18 22:50:23,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 22:50:23,165 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:23,165 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:23,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 22:50:23,165 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:23,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:23,166 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-18 22:50:23,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:23,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1493814135] [2020-08-18 22:50:23,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:23,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:23,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:23,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:23,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:23,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:24,450 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:24,450 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1493814135] [2020-08-18 22:50:24,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:24,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 22:50:24,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394772621] [2020-08-18 22:50:24,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 22:50:24,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:24,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 22:50:24,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-18 22:50:24,452 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-18 22:50:24,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:24,771 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-18 22:50:24,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 22:50:24,772 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-18 22:50:24,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:24,773 INFO L225 Difference]: With dead ends: 104 [2020-08-18 22:50:24,773 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 22:50:24,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:50:24,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 22:50:24,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 22:50:24,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 22:50:24,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-18 22:50:24,780 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-18 22:50:24,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:24,780 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-18 22:50:24,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 22:50:24,780 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-18 22:50:24,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 22:50:24,781 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:24,781 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:24,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 22:50:24,781 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:24,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:24,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-18 22:50:24,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:24,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1221204082] [2020-08-18 22:50:24,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:24,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:24,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:24,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:24,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:24,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:26,158 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:26,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1221204082] [2020-08-18 22:50:26,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:26,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 22:50:26,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128840066] [2020-08-18 22:50:26,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 22:50:26,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:26,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 22:50:26,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:50:26,162 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-18 22:50:26,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:26,594 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-18 22:50:26,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 22:50:26,595 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-18 22:50:26,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:26,596 INFO L225 Difference]: With dead ends: 106 [2020-08-18 22:50:26,596 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 22:50:26,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 22:50:26,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 22:50:26,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 22:50:26,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 22:50:26,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-18 22:50:26,602 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-18 22:50:26,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:26,602 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-18 22:50:26,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 22:50:26,602 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-18 22:50:26,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 22:50:26,603 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:26,603 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:26,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 22:50:26,603 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:26,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:26,604 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-18 22:50:26,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:26,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [639844421] [2020-08-18 22:50:26,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:26,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:26,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:26,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:26,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:26,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:28,182 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:28,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [639844421] [2020-08-18 22:50:28,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:28,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 22:50:28,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935966011] [2020-08-18 22:50:28,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 22:50:28,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:28,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 22:50:28,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-18 22:50:28,184 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-18 22:50:28,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:28,616 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-18 22:50:28,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 22:50:28,616 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-18 22:50:28,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:28,618 INFO L225 Difference]: With dead ends: 108 [2020-08-18 22:50:28,618 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 22:50:28,619 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 22:50:28,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 22:50:28,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 22:50:28,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 22:50:28,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-18 22:50:28,623 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-18 22:50:28,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:28,623 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-18 22:50:28,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 22:50:28,623 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-18 22:50:28,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 22:50:28,624 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:28,624 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:28,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 22:50:28,624 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:28,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:28,625 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-18 22:50:28,625 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:28,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [406720283] [2020-08-18 22:50:28,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:28,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:28,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:28,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:28,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:28,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:30,129 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:30,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [406720283] [2020-08-18 22:50:30,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:30,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 22:50:30,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495881468] [2020-08-18 22:50:30,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 22:50:30,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:30,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 22:50:30,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:50:30,135 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-18 22:50:30,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:30,611 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-18 22:50:30,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 22:50:30,618 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-18 22:50:30,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:30,619 INFO L225 Difference]: With dead ends: 110 [2020-08-18 22:50:30,619 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 22:50:30,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 22:50:30,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 22:50:30,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 22:50:30,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 22:50:30,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-18 22:50:30,625 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-18 22:50:30,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:30,626 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-18 22:50:30,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 22:50:30,626 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-18 22:50:30,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 22:50:30,627 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:30,627 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:30,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 22:50:30,627 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:30,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:30,627 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-18 22:50:30,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:30,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [696817744] [2020-08-18 22:50:30,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:30,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:30,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:30,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:30,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:30,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:32,356 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:32,357 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [696817744] [2020-08-18 22:50:32,357 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:32,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 22:50:32,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465577420] [2020-08-18 22:50:32,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 22:50:32,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:32,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 22:50:32,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 22:50:32,358 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-18 22:50:32,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:32,881 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-18 22:50:32,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 22:50:32,881 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-18 22:50:32,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:32,882 INFO L225 Difference]: With dead ends: 112 [2020-08-18 22:50:32,882 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 22:50:32,883 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 22:50:32,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 22:50:32,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 22:50:32,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 22:50:32,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-18 22:50:32,888 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-18 22:50:32,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:32,889 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-18 22:50:32,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 22:50:32,889 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-18 22:50:32,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 22:50:32,889 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:32,891 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:32,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 22:50:32,891 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:32,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:32,891 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-18 22:50:32,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:32,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2039791475] [2020-08-18 22:50:32,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:32,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:32,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:32,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:32,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:32,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:34,610 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:34,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2039791475] [2020-08-18 22:50:34,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:34,611 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 22:50:34,611 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633581982] [2020-08-18 22:50:34,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 22:50:34,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:34,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 22:50:34,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 22:50:34,612 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-18 22:50:35,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:35,090 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-18 22:50:35,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 22:50:35,090 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-18 22:50:35,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:35,091 INFO L225 Difference]: With dead ends: 114 [2020-08-18 22:50:35,091 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 22:50:35,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:50:35,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 22:50:35,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 22:50:35,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 22:50:35,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-18 22:50:35,100 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-18 22:50:35,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:35,101 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-18 22:50:35,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 22:50:35,101 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-18 22:50:35,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 22:50:35,101 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:35,102 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:35,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 22:50:35,103 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:35,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:35,103 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-18 22:50:35,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:35,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [133551343] [2020-08-18 22:50:35,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:35,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:35,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:35,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:35,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:35,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:36,903 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:36,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [133551343] [2020-08-18 22:50:36,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:36,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 22:50:36,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293949822] [2020-08-18 22:50:36,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 22:50:36,904 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:36,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 22:50:36,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 22:50:36,905 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-18 22:50:37,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:37,289 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-18 22:50:37,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 22:50:37,290 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-18 22:50:37,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:37,291 INFO L225 Difference]: With dead ends: 116 [2020-08-18 22:50:37,291 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 22:50:37,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:50:37,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 22:50:37,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 22:50:37,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 22:50:37,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-18 22:50:37,314 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-18 22:50:37,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:37,315 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-18 22:50:37,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 22:50:37,315 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-18 22:50:37,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 22:50:37,316 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:37,316 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:37,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 22:50:37,316 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:37,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:37,316 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-18 22:50:37,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:37,316 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [924502674] [2020-08-18 22:50:37,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:37,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:37,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:37,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:37,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:37,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:39,182 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:39,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [924502674] [2020-08-18 22:50:39,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:39,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 22:50:39,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772865906] [2020-08-18 22:50:39,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 22:50:39,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:39,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 22:50:39,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 22:50:39,184 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-18 22:50:39,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:39,691 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-18 22:50:39,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 22:50:39,691 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-18 22:50:39,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:39,693 INFO L225 Difference]: With dead ends: 118 [2020-08-18 22:50:39,693 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 22:50:39,694 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 22:50:39,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 22:50:39,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 22:50:39,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 22:50:39,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-18 22:50:39,699 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-18 22:50:39,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:39,700 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-18 22:50:39,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 22:50:39,700 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-18 22:50:39,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 22:50:39,700 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:39,700 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:39,701 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 22:50:39,701 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:39,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:39,701 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-18 22:50:39,701 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:39,702 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142157691] [2020-08-18 22:50:39,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:39,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:39,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:39,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:39,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:39,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:41,713 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:41,714 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [142157691] [2020-08-18 22:50:41,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:41,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 22:50:41,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656111006] [2020-08-18 22:50:41,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 22:50:41,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:41,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 22:50:41,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:50:41,716 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-18 22:50:42,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:42,168 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-18 22:50:42,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 22:50:42,169 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-18 22:50:42,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:42,170 INFO L225 Difference]: With dead ends: 120 [2020-08-18 22:50:42,170 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 22:50:42,171 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:50:42,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 22:50:42,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 22:50:42,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 22:50:42,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-18 22:50:42,177 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-18 22:50:42,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:42,178 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-18 22:50:42,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 22:50:42,178 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-18 22:50:42,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 22:50:42,178 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:42,179 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:42,179 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 22:50:42,179 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:42,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:42,179 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-18 22:50:42,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:42,180 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571417536] [2020-08-18 22:50:42,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:42,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:42,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:42,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:44,338 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:44,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571417536] [2020-08-18 22:50:44,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:44,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 22:50:44,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904795320] [2020-08-18 22:50:44,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 22:50:44,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:44,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 22:50:44,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:50:44,341 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-18 22:50:44,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:44,703 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-18 22:50:44,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 22:50:44,704 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-18 22:50:44,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:44,705 INFO L225 Difference]: With dead ends: 122 [2020-08-18 22:50:44,705 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 22:50:44,707 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 22:50:44,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 22:50:44,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 22:50:44,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 22:50:44,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-18 22:50:44,712 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-18 22:50:44,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:44,712 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-18 22:50:44,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 22:50:44,712 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-18 22:50:44,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 22:50:44,713 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:44,713 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:44,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 22:50:44,714 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:44,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:44,714 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-18 22:50:44,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:44,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1248213652] [2020-08-18 22:50:44,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:44,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:44,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:44,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:44,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:44,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:46,887 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:46,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1248213652] [2020-08-18 22:50:46,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:46,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 22:50:46,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237552342] [2020-08-18 22:50:46,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 22:50:46,888 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:46,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 22:50:46,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 22:50:46,889 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-18 22:50:47,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:47,223 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-18 22:50:47,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 22:50:47,224 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-18 22:50:47,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:47,225 INFO L225 Difference]: With dead ends: 124 [2020-08-18 22:50:47,225 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 22:50:47,227 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 22:50:47,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 22:50:47,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 22:50:47,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 22:50:47,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-18 22:50:47,231 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-18 22:50:47,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:47,232 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-18 22:50:47,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 22:50:47,232 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-18 22:50:47,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 22:50:47,233 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:47,233 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:47,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 22:50:47,233 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:47,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:47,233 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-18 22:50:47,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:47,234 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [217279218] [2020-08-18 22:50:47,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:47,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:47,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:47,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:47,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:47,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:49,596 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:49,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [217279218] [2020-08-18 22:50:49,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:49,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 22:50:49,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658668218] [2020-08-18 22:50:49,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 22:50:49,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:49,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 22:50:49,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:50:49,599 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-18 22:50:49,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:49,955 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-18 22:50:49,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 22:50:49,956 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-18 22:50:49,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:49,957 INFO L225 Difference]: With dead ends: 126 [2020-08-18 22:50:49,958 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 22:50:49,959 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 22:50:49,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 22:50:49,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 22:50:49,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 22:50:49,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-18 22:50:49,963 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-18 22:50:49,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:49,964 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-18 22:50:49,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 22:50:49,964 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-18 22:50:49,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 22:50:49,965 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:49,965 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:49,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 22:50:49,965 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:49,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:49,965 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-18 22:50:49,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:49,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [305119989] [2020-08-18 22:50:49,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:49,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:50,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:50,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:50,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:50,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:52,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:52,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [305119989] [2020-08-18 22:50:52,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:52,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 22:50:52,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212478041] [2020-08-18 22:50:52,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 22:50:52,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:52,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 22:50:52,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 22:50:52,368 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-18 22:50:52,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:52,851 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-18 22:50:52,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 22:50:52,852 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-18 22:50:52,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:52,853 INFO L225 Difference]: With dead ends: 128 [2020-08-18 22:50:52,853 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 22:50:52,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 22:50:52,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 22:50:52,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 22:50:52,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 22:50:52,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-18 22:50:52,863 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-18 22:50:52,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:52,863 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-18 22:50:52,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 22:50:52,863 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-18 22:50:52,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 22:50:52,864 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:52,864 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:52,864 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 22:50:52,864 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:52,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:52,865 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-18 22:50:52,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:52,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [764544320] [2020-08-18 22:50:52,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:52,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:52,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:52,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:52,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:52,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:55,404 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 22:50:55,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [764544320] [2020-08-18 22:50:55,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:55,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 22:50:55,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901646729] [2020-08-18 22:50:55,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 22:50:55,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:55,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 22:50:55,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 22:50:55,407 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-18 22:50:55,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:55,983 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-18 22:50:55,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 22:50:55,984 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-18 22:50:55,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:55,985 INFO L225 Difference]: With dead ends: 130 [2020-08-18 22:50:55,985 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 22:50:55,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 22:50:55,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 22:50:55,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 22:50:55,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 22:50:55,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-18 22:50:55,991 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-18 22:50:55,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:55,992 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-18 22:50:55,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 22:50:55,992 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-18 22:50:55,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 22:50:55,993 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:55,993 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:55,993 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 22:50:55,993 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:55,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:55,993 INFO L82 PathProgramCache]: Analyzing trace with hash 1007038322, now seen corresponding path program 30 times [2020-08-18 22:50:55,994 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:55,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [129281002] [2020-08-18 22:50:55,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:56,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:56,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:56,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:56,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:50:56,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat