/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/afnp2014.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 15:36:25,118 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-18 15:36:25,161 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 15:36:25,162 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 15:36:25,163 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 15:36:25,164 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 15:36:25,165 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 15:36:25,166 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 15:36:25,168 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 15:36:25,170 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 15:36:25,172 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 15:36:25,174 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 15:36:25,175 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 15:36:25,176 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 15:36:25,181 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 15:36:25,189 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 15:36:25,190 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 15:36:25,191 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 15:36:25,192 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 15:36:25,216 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 15:36:25,216 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 15:36:25,218 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 15:36:25,218 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 15:36:25,218 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 15:36:25,218 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 15:36:25,219 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 15:36:25,219 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 15:36:25,219 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 15:36:25,219 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 15:36:25,219 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 15:36:25,219 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 15:36:25,220 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 15:36:25,220 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 15:36:25,220 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 15:36:25,220 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 15:36:25,220 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 15:36:25,221 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 15:36:25,221 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 15:36:25,221 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 15:36:25,221 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 15:36:25,221 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 15:36:25,222 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 15:36:25,222 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 15:36:25,222 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 15:36:25,222 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 15:36:25,222 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 15:36:25,223 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 15:36:25,223 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 15:36:25,223 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false [2020-08-18 15:36:25,550 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 15:36:25,563 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 15:36:25,567 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 15:36:25,569 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 15:36:25,569 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 15:36:25,570 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-18 15:36:25,640 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f6bb091ff/3d98d4ba12954eed95aeef04d6353a77/FLAG145b1fbf5 [2020-08-18 15:36:26,116 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 15:36:26,116 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-18 15:36:26,126 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f6bb091ff/3d98d4ba12954eed95aeef04d6353a77/FLAG145b1fbf5 [2020-08-18 15:36:26,504 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f6bb091ff/3d98d4ba12954eed95aeef04d6353a77 [2020-08-18 15:36:26,512 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 15:36:26,514 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 15:36:26,515 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 15:36:26,515 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 15:36:26,519 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 15:36:26,520 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 03:36:26" (1/1) ... [2020-08-18 15:36:26,527 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ac45341 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:26, skipping insertion in model container [2020-08-18 15:36:26,528 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 03:36:26" (1/1) ... [2020-08-18 15:36:26,537 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 15:36:26,555 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 15:36:26,732 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 15:36:26,736 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 15:36:26,751 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 15:36:26,767 INFO L208 MainTranslator]: Completed translation [2020-08-18 15:36:26,767 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:26 WrapperNode [2020-08-18 15:36:26,768 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 15:36:26,768 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 15:36:26,769 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 15:36:26,769 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 15:36:26,782 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:26" (1/1) ... [2020-08-18 15:36:26,783 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:26" (1/1) ... [2020-08-18 15:36:26,897 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:26" (1/1) ... [2020-08-18 15:36:26,898 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:26" (1/1) ... [2020-08-18 15:36:26,902 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:26" (1/1) ... [2020-08-18 15:36:26,907 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:26" (1/1) ... [2020-08-18 15:36:26,908 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:26" (1/1) ... [2020-08-18 15:36:26,909 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 15:36:26,910 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 15:36:26,910 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 15:36:26,910 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 15:36:26,911 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:26" (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 15:36:26,970 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 15:36:26,971 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 15:36:26,971 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 15:36:26,971 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 15:36:26,971 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 15:36:26,971 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 15:36:26,971 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 15:36:26,972 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 15:36:26,972 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 15:36:26,972 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 15:36:26,972 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 15:36:26,972 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 15:36:26,972 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 15:36:27,159 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 15:36:27,160 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 15:36:27,163 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 03:36:27 BoogieIcfgContainer [2020-08-18 15:36:27,163 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 15:36:27,165 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 15:36:27,165 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 15:36:27,168 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 15:36:27,168 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 03:36:26" (1/3) ... [2020-08-18 15:36:27,169 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@578adc2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 03:36:27, skipping insertion in model container [2020-08-18 15:36:27,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:36:26" (2/3) ... [2020-08-18 15:36:27,170 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@578adc2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 03:36:27, skipping insertion in model container [2020-08-18 15:36:27,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 03:36:27" (3/3) ... [2020-08-18 15:36:27,172 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-18 15:36:27,183 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 15:36:27,190 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 15:36:27,206 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 15:36:27,226 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 15:36:27,226 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 15:36:27,227 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 15:36:27,227 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 15:36:27,227 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 15:36:27,227 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 15:36:27,227 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 15:36:27,227 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 15:36:27,243 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-18 15:36:27,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 15:36:27,249 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:27,249 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:27,250 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:27,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:27,255 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-18 15:36:27,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:27,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [538188893] [2020-08-18 15:36:27,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:27,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:27,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:27,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:27,367 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 15:36:27,368 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [538188893] [2020-08-18 15:36:27,370 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 15:36:27,370 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 15:36:27,371 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997161606] [2020-08-18 15:36:27,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 15:36:27,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:27,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 15:36:27,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 15:36:27,394 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-18 15:36:27,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:27,417 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-18 15:36:27,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 15:36:27,418 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-18 15:36:27,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:27,427 INFO L225 Difference]: With dead ends: 32 [2020-08-18 15:36:27,427 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 15:36:27,430 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 15:36:27,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 15:36:27,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 15:36:27,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 15:36:27,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-18 15:36:27,465 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-18 15:36:27,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:27,466 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-18 15:36:27,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 15:36:27,466 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-18 15:36:27,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 15:36:27,467 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:27,467 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:27,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 15:36:27,468 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:27,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:27,469 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-18 15:36:27,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:27,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1302526641] [2020-08-18 15:36:27,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:27,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:27,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:27,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:27,618 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 15:36:27,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1302526641] [2020-08-18 15:36:27,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 15:36:27,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 15:36:27,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419879680] [2020-08-18 15:36:27,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 15:36:27,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:27,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 15:36:27,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 15:36:27,623 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-18 15:36:27,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:27,677 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-18 15:36:27,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 15:36:27,678 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 15:36:27,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:27,680 INFO L225 Difference]: With dead ends: 21 [2020-08-18 15:36:27,680 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 15:36:27,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 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 15:36:27,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 15:36:27,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 15:36:27,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 15:36:27,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 15:36:27,690 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-18 15:36:27,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:27,690 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 15:36:27,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 15:36:27,691 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 15:36:27,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 15:36:27,692 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:27,692 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:27,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 15:36:27,692 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:27,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:27,693 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-18 15:36:27,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:27,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1041078318] [2020-08-18 15:36:27,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:27,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:27,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:27,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:27,851 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:27,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1041078318] [2020-08-18 15:36:27,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:27,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 15:36:27,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749449591] [2020-08-18 15:36:27,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 15:36:27,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:27,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 15:36:27,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 15:36:27,854 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-18 15:36:27,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:27,917 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-18 15:36:27,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 15:36:27,918 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-18 15:36:27,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:27,919 INFO L225 Difference]: With dead ends: 24 [2020-08-18 15:36:27,919 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 15:36:27,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 15:36:27,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 15:36:27,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 15:36:27,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 15:36:27,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-18 15:36:27,926 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-18 15:36:27,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:27,926 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-18 15:36:27,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 15:36:27,926 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-18 15:36:27,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 15:36:27,927 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:27,927 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:27,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 15:36:27,928 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:27,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:27,928 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-18 15:36:27,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:27,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [677618757] [2020-08-18 15:36:27,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:27,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:28,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:28,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:28,044 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 15:36:28,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [677618757] [2020-08-18 15:36:28,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:28,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 15:36:28,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546710561] [2020-08-18 15:36:28,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 15:36:28,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:28,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 15:36:28,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 15:36:28,047 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-18 15:36:28,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:28,124 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-18 15:36:28,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 15:36:28,124 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-18 15:36:28,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:28,125 INFO L225 Difference]: With dead ends: 27 [2020-08-18 15:36:28,125 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 15:36:28,126 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 15:36:28,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 15:36:28,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 15:36:28,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 15:36:28,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-18 15:36:28,132 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-18 15:36:28,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:28,132 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-18 15:36:28,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 15:36:28,133 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-18 15:36:28,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 15:36:28,133 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:28,134 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:28,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 15:36:28,134 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:28,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:28,135 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-18 15:36:28,135 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:28,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1950625563] [2020-08-18 15:36:28,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:28,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:28,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:28,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:28,282 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:28,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1950625563] [2020-08-18 15:36:28,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:28,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 15:36:28,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535253014] [2020-08-18 15:36:28,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 15:36:28,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:28,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 15:36:28,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-18 15:36:28,287 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-18 15:36:28,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:28,404 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-18 15:36:28,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 15:36:28,404 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-18 15:36:28,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:28,405 INFO L225 Difference]: With dead ends: 30 [2020-08-18 15:36:28,405 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 15:36:28,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-18 15:36:28,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 15:36:28,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 15:36:28,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 15:36:28,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-18 15:36:28,412 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-18 15:36:28,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:28,413 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-18 15:36:28,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 15:36:28,413 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-18 15:36:28,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 15:36:28,414 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:28,414 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:28,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 15:36:28,415 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:28,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:28,415 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-18 15:36:28,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:28,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240185904] [2020-08-18 15:36:28,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:28,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:28,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:28,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:28,543 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:28,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1240185904] [2020-08-18 15:36:28,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:28,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 15:36:28,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256677814] [2020-08-18 15:36:28,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 15:36:28,545 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:28,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 15:36:28,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-18 15:36:28,545 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-18 15:36:28,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:28,634 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-18 15:36:28,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 15:36:28,634 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-18 15:36:28,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:28,635 INFO L225 Difference]: With dead ends: 33 [2020-08-18 15:36:28,635 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 15:36:28,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-08-18 15:36:28,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 15:36:28,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 15:36:28,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 15:36:28,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-18 15:36:28,643 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-18 15:36:28,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:28,643 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-18 15:36:28,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 15:36:28,643 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-18 15:36:28,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 15:36:28,644 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:28,644 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:28,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 15:36:28,645 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:28,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:28,645 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-18 15:36:28,646 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:28,646 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1276904918] [2020-08-18 15:36:28,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:28,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:28,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:28,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:28,763 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:28,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1276904918] [2020-08-18 15:36:28,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:28,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 15:36:28,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765247790] [2020-08-18 15:36:28,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 15:36:28,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:28,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 15:36:28,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-18 15:36:28,765 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-18 15:36:28,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:28,862 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-18 15:36:28,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 15:36:28,863 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-18 15:36:28,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:28,864 INFO L225 Difference]: With dead ends: 36 [2020-08-18 15:36:28,864 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 15:36:28,865 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-18 15:36:28,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 15:36:28,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 15:36:28,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 15:36:28,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-18 15:36:28,871 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-18 15:36:28,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:28,872 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-18 15:36:28,872 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 15:36:28,872 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-18 15:36:28,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 15:36:28,873 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:28,873 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:28,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 15:36:28,874 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:28,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:28,874 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-18 15:36:28,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:28,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [543455382] [2020-08-18 15:36:28,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:28,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:29,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:29,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:29,012 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:29,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [543455382] [2020-08-18 15:36:29,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:29,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 15:36:29,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709673711] [2020-08-18 15:36:29,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 15:36:29,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:29,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 15:36:29,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-18 15:36:29,014 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-18 15:36:29,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:29,144 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-18 15:36:29,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 15:36:29,145 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 15:36:29,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:29,146 INFO L225 Difference]: With dead ends: 39 [2020-08-18 15:36:29,146 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 15:36:29,146 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-08-18 15:36:29,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 15:36:29,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 15:36:29,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 15:36:29,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-18 15:36:29,153 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-18 15:36:29,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:29,153 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-18 15:36:29,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 15:36:29,154 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-18 15:36:29,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 15:36:29,155 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:29,155 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:29,155 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 15:36:29,155 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:29,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:29,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-18 15:36:29,156 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:29,156 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1970178472] [2020-08-18 15:36:29,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:29,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:29,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:29,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:29,312 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:29,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1970178472] [2020-08-18 15:36:29,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:29,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 15:36:29,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546350588] [2020-08-18 15:36:29,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 15:36:29,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:29,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 15:36:29,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-18 15:36:29,316 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-18 15:36:29,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:29,476 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-18 15:36:29,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 15:36:29,477 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-18 15:36:29,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:29,478 INFO L225 Difference]: With dead ends: 42 [2020-08-18 15:36:29,478 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 15:36:29,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2020-08-18 15:36:29,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 15:36:29,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 15:36:29,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 15:36:29,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-18 15:36:29,486 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-18 15:36:29,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:29,486 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-18 15:36:29,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 15:36:29,486 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-18 15:36:29,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 15:36:29,487 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:29,488 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:29,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 15:36:29,488 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:29,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:29,488 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-18 15:36:29,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:29,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251759005] [2020-08-18 15:36:29,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:29,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:29,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:29,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:29,681 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:29,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251759005] [2020-08-18 15:36:29,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:29,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 15:36:29,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724381135] [2020-08-18 15:36:29,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 15:36:29,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:29,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 15:36:29,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 15:36:29,683 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-18 15:36:29,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:29,853 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-18 15:36:29,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 15:36:29,853 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 15:36:29,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:29,855 INFO L225 Difference]: With dead ends: 45 [2020-08-18 15:36:29,855 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 15:36:29,855 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2020-08-18 15:36:29,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 15:36:29,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 15:36:29,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 15:36:29,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-18 15:36:29,862 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-18 15:36:29,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:29,862 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-18 15:36:29,862 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 15:36:29,862 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-18 15:36:29,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 15:36:29,863 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:29,864 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:29,864 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 15:36:29,864 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:29,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:29,865 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-18 15:36:29,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:29,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1888707740] [2020-08-18 15:36:29,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:29,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:30,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:30,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:30,051 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:30,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1888707740] [2020-08-18 15:36:30,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:30,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 15:36:30,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512713996] [2020-08-18 15:36:30,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 15:36:30,053 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:30,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 15:36:30,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-18 15:36:30,054 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-18 15:36:30,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:30,237 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-18 15:36:30,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 15:36:30,238 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-18 15:36:30,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:30,239 INFO L225 Difference]: With dead ends: 48 [2020-08-18 15:36:30,239 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 15:36:30,239 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2020-08-18 15:36:30,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 15:36:30,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 15:36:30,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 15:36:30,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-18 15:36:30,245 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-18 15:36:30,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:30,255 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-18 15:36:30,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 15:36:30,255 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-18 15:36:30,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 15:36:30,256 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:30,256 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:30,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 15:36:30,257 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:30,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:30,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-18 15:36:30,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:30,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836733872] [2020-08-18 15:36:30,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:30,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:30,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:30,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:30,441 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:30,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836733872] [2020-08-18 15:36:30,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:30,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 15:36:30,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951288783] [2020-08-18 15:36:30,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 15:36:30,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:30,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 15:36:30,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-18 15:36:30,444 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-18 15:36:30,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:30,700 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-18 15:36:30,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 15:36:30,700 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-18 15:36:30,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:30,701 INFO L225 Difference]: With dead ends: 51 [2020-08-18 15:36:30,701 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 15:36:30,702 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2020-08-18 15:36:30,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 15:36:30,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 15:36:30,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 15:36:30,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-18 15:36:30,715 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-18 15:36:30,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:30,715 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-18 15:36:30,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 15:36:30,720 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-18 15:36:30,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 15:36:30,721 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:30,721 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:30,721 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 15:36:30,721 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:30,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:30,722 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-18 15:36:30,722 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:30,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1771988163] [2020-08-18 15:36:30,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:30,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:30,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:30,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:30,954 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:30,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1771988163] [2020-08-18 15:36:30,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:30,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 15:36:30,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089616773] [2020-08-18 15:36:30,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 15:36:30,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:30,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 15:36:30,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-18 15:36:30,957 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-18 15:36:31,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:31,281 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-18 15:36:31,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 15:36:31,281 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-18 15:36:31,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:31,282 INFO L225 Difference]: With dead ends: 54 [2020-08-18 15:36:31,282 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 15:36:31,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2020-08-18 15:36:31,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 15:36:31,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 15:36:31,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 15:36:31,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-18 15:36:31,290 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-18 15:36:31,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:31,290 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-18 15:36:31,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 15:36:31,290 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-18 15:36:31,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 15:36:31,291 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:31,291 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:31,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 15:36:31,292 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:31,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:31,292 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-18 15:36:31,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:31,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052799999] [2020-08-18 15:36:31,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:31,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:31,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:31,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:31,532 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:31,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052799999] [2020-08-18 15:36:31,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:31,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 15:36:31,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095494603] [2020-08-18 15:36:31,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 15:36:31,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:31,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 15:36:31,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-18 15:36:31,535 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-18 15:36:31,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:31,830 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-18 15:36:31,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 15:36:31,830 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 15:36:31,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:31,831 INFO L225 Difference]: With dead ends: 57 [2020-08-18 15:36:31,832 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 15:36:31,832 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2020-08-18 15:36:31,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 15:36:31,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 15:36:31,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 15:36:31,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-18 15:36:31,842 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-18 15:36:31,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:31,842 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-18 15:36:31,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 15:36:31,843 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-18 15:36:31,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 15:36:31,846 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:31,846 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:31,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 15:36:31,846 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:31,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:31,847 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-18 15:36:31,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:31,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1620902896] [2020-08-18 15:36:31,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:31,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:32,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:32,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:32,137 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:32,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1620902896] [2020-08-18 15:36:32,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:32,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 15:36:32,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413981557] [2020-08-18 15:36:32,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 15:36:32,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:32,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 15:36:32,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-18 15:36:32,141 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-18 15:36:32,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:32,476 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-18 15:36:32,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 15:36:32,476 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-18 15:36:32,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:32,477 INFO L225 Difference]: With dead ends: 60 [2020-08-18 15:36:32,477 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 15:36:32,481 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-18 15:36:32,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 15:36:32,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 15:36:32,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 15:36:32,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-18 15:36:32,496 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-18 15:36:32,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:32,497 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-18 15:36:32,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 15:36:32,497 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-18 15:36:32,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 15:36:32,498 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:32,498 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:32,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 15:36:32,498 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:32,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:32,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-18 15:36:32,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:32,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [303144913] [2020-08-18 15:36:32,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:32,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:32,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:32,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:32,788 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:32,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [303144913] [2020-08-18 15:36:32,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:32,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 15:36:32,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10324804] [2020-08-18 15:36:32,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 15:36:32,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:32,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 15:36:32,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-18 15:36:32,793 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-18 15:36:33,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:33,141 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-18 15:36:33,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 15:36:33,141 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-18 15:36:33,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:33,142 INFO L225 Difference]: With dead ends: 63 [2020-08-18 15:36:33,143 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 15:36:33,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2020-08-18 15:36:33,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 15:36:33,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 15:36:33,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 15:36:33,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-18 15:36:33,151 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-18 15:36:33,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:33,152 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-18 15:36:33,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 15:36:33,152 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-18 15:36:33,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 15:36:33,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:33,153 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:33,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 15:36:33,153 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:33,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:33,154 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-18 15:36:33,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:33,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [101376499] [2020-08-18 15:36:33,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:33,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:33,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:33,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:33,448 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:33,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [101376499] [2020-08-18 15:36:33,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:33,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 15:36:33,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379483466] [2020-08-18 15:36:33,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 15:36:33,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:33,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 15:36:33,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-18 15:36:33,451 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-18 15:36:33,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:33,868 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-18 15:36:33,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 15:36:33,869 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-18 15:36:33,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:33,869 INFO L225 Difference]: With dead ends: 66 [2020-08-18 15:36:33,869 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 15:36:33,870 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2020-08-18 15:36:33,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 15:36:33,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-18 15:36:33,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 15:36:33,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-18 15:36:33,877 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-18 15:36:33,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:33,877 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-18 15:36:33,877 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 15:36:33,877 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-18 15:36:33,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 15:36:33,878 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:33,878 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:33,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 15:36:33,878 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:33,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:33,878 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-18 15:36:33,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:33,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [846703170] [2020-08-18 15:36:33,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:33,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:34,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:34,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:34,199 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:34,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [846703170] [2020-08-18 15:36:34,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:34,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 15:36:34,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166230788] [2020-08-18 15:36:34,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 15:36:34,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:34,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 15:36:34,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-18 15:36:34,202 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-18 15:36:34,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:34,635 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-18 15:36:34,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 15:36:34,635 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-18 15:36:34,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:34,636 INFO L225 Difference]: With dead ends: 69 [2020-08-18 15:36:34,636 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 15:36:34,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2020-08-18 15:36:34,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 15:36:34,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-18 15:36:34,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 15:36:34,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-18 15:36:34,653 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-18 15:36:34,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:34,653 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-18 15:36:34,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 15:36:34,653 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-18 15:36:34,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 15:36:34,654 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:34,654 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:34,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 15:36:34,654 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:34,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:34,660 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-18 15:36:34,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:34,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1085901241] [2020-08-18 15:36:34,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:34,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:35,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:35,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:35,024 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:35,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1085901241] [2020-08-18 15:36:35,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:35,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 15:36:35,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462376036] [2020-08-18 15:36:35,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 15:36:35,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:35,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 15:36:35,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-18 15:36:35,030 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-18 15:36:35,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:35,490 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-18 15:36:35,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 15:36:35,495 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-18 15:36:35,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:35,496 INFO L225 Difference]: With dead ends: 72 [2020-08-18 15:36:35,496 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 15:36:35,497 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2020-08-18 15:36:35,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 15:36:35,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-18 15:36:35,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 15:36:35,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-18 15:36:35,504 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-18 15:36:35,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:35,504 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-18 15:36:35,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 15:36:35,504 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-18 15:36:35,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 15:36:35,505 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:35,505 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:35,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 15:36:35,506 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:35,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:35,506 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-18 15:36:35,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:35,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [861300433] [2020-08-18 15:36:35,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:35,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:35,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:35,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:35,866 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:35,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [861300433] [2020-08-18 15:36:35,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:35,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 15:36:35,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460570465] [2020-08-18 15:36:35,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 15:36:35,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:35,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 15:36:35,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-18 15:36:35,868 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-18 15:36:36,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:36,361 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-18 15:36:36,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 15:36:36,362 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-18 15:36:36,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:36,363 INFO L225 Difference]: With dead ends: 75 [2020-08-18 15:36:36,363 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 15:36:36,364 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2020-08-18 15:36:36,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 15:36:36,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-18 15:36:36,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 15:36:36,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-18 15:36:36,371 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-18 15:36:36,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:36,371 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-18 15:36:36,371 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 15:36:36,371 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-18 15:36:36,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 15:36:36,372 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:36,372 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:36,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 15:36:36,372 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:36,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:36,373 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-18 15:36:36,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:36,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [337978625] [2020-08-18 15:36:36,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:36,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:36,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:36,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:36,740 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:36,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [337978625] [2020-08-18 15:36:36,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:36,741 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 15:36:36,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418248330] [2020-08-18 15:36:36,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 15:36:36,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:36,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 15:36:36,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-18 15:36:36,743 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-18 15:36:37,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:37,339 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-18 15:36:37,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 15:36:37,340 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-18 15:36:37,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:37,343 INFO L225 Difference]: With dead ends: 78 [2020-08-18 15:36:37,343 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 15:36:37,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2020-08-18 15:36:37,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 15:36:37,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-18 15:36:37,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 15:36:37,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-18 15:36:37,358 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-18 15:36:37,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:37,359 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-18 15:36:37,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 15:36:37,359 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-18 15:36:37,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 15:36:37,360 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:37,360 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:37,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 15:36:37,360 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:37,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:37,361 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-18 15:36:37,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:37,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [573539937] [2020-08-18 15:36:37,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:37,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:37,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:37,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:37,737 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:37,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [573539937] [2020-08-18 15:36:37,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:37,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 15:36:37,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514473772] [2020-08-18 15:36:37,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 15:36:37,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:37,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 15:36:37,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-18 15:36:37,739 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-18 15:36:38,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:38,386 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-18 15:36:38,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 15:36:38,386 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-18 15:36:38,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:38,387 INFO L225 Difference]: With dead ends: 81 [2020-08-18 15:36:38,387 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 15:36:38,388 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2020-08-18 15:36:38,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 15:36:38,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-18 15:36:38,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 15:36:38,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-18 15:36:38,397 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-18 15:36:38,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:38,398 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-18 15:36:38,398 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 15:36:38,398 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-18 15:36:38,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 15:36:38,399 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:38,399 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:38,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 15:36:38,400 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:38,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:38,400 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-18 15:36:38,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:38,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [174157748] [2020-08-18 15:36:38,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:38,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:38,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:38,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:38,871 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:38,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [174157748] [2020-08-18 15:36:38,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:38,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 15:36:38,878 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537862746] [2020-08-18 15:36:38,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 15:36:38,881 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:38,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 15:36:38,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-18 15:36:38,883 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-18 15:36:39,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:39,603 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-18 15:36:39,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 15:36:39,604 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-18 15:36:39,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:39,605 INFO L225 Difference]: With dead ends: 84 [2020-08-18 15:36:39,605 INFO L226 Difference]: Without dead ends: 79 [2020-08-18 15:36:39,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-18 15:36:39,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-18 15:36:39,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-18 15:36:39,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 15:36:39,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-18 15:36:39,612 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-18 15:36:39,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:39,613 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-18 15:36:39,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 15:36:39,613 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-18 15:36:39,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 15:36:39,614 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:39,614 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:39,614 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 15:36:39,614 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:39,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:39,615 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-18 15:36:39,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:39,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1151375216] [2020-08-18 15:36:39,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:39,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:40,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:40,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:40,096 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:40,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1151375216] [2020-08-18 15:36:40,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:40,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 15:36:40,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425889120] [2020-08-18 15:36:40,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 15:36:40,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:40,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 15:36:40,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-18 15:36:40,098 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-18 15:36:40,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:40,847 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-18 15:36:40,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 15:36:40,847 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-18 15:36:40,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:40,848 INFO L225 Difference]: With dead ends: 87 [2020-08-18 15:36:40,848 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 15:36:40,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2020-08-18 15:36:40,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 15:36:40,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-18 15:36:40,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 15:36:40,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-18 15:36:40,857 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-18 15:36:40,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:40,858 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-18 15:36:40,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 15:36:40,858 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-18 15:36:40,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 15:36:40,859 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:40,859 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:40,860 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 15:36:40,862 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:40,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:40,863 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-18 15:36:40,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:40,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [271171161] [2020-08-18 15:36:40,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:40,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:41,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:41,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:41,416 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:41,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [271171161] [2020-08-18 15:36:41,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:41,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 15:36:41,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721339321] [2020-08-18 15:36:41,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 15:36:41,418 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:41,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 15:36:41,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-18 15:36:41,419 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-18 15:36:42,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:42,185 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-18 15:36:42,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 15:36:42,185 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-18 15:36:42,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:42,186 INFO L225 Difference]: With dead ends: 90 [2020-08-18 15:36:42,187 INFO L226 Difference]: Without dead ends: 85 [2020-08-18 15:36:42,187 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2020-08-18 15:36:42,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-18 15:36:42,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-18 15:36:42,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 15:36:42,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-18 15:36:42,194 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-18 15:36:42,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:42,195 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-18 15:36:42,195 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 15:36:42,195 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-18 15:36:42,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 15:36:42,196 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:42,196 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:42,196 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 15:36:42,196 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:42,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:42,197 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-18 15:36:42,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:42,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [76581431] [2020-08-18 15:36:42,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:42,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:42,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:42,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:42,925 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:42,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [76581431] [2020-08-18 15:36:42,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:42,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 15:36:42,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500265394] [2020-08-18 15:36:42,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 15:36:42,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:42,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 15:36:42,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-18 15:36:42,930 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-18 15:36:44,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:44,029 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-18 15:36:44,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 15:36:44,030 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-18 15:36:44,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:44,031 INFO L225 Difference]: With dead ends: 93 [2020-08-18 15:36:44,031 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 15:36:44,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-08-18 15:36:44,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 15:36:44,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-18 15:36:44,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 15:36:44,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-18 15:36:44,040 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-18 15:36:44,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:44,041 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-18 15:36:44,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 15:36:44,041 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-18 15:36:44,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 15:36:44,042 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:44,042 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:44,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 15:36:44,042 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:44,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:44,044 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-18 15:36:44,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:44,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [328333225] [2020-08-18 15:36:44,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:44,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:44,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:44,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:44,668 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:44,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [328333225] [2020-08-18 15:36:44,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:44,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 15:36:44,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592490668] [2020-08-18 15:36:44,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 15:36:44,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:44,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 15:36:44,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-18 15:36:44,670 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-18 15:36:45,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:45,645 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-18 15:36:45,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 15:36:45,645 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-18 15:36:45,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:45,647 INFO L225 Difference]: With dead ends: 96 [2020-08-18 15:36:45,647 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 15:36:45,648 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2020-08-18 15:36:45,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 15:36:45,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-18 15:36:45,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 15:36:45,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-18 15:36:45,655 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-18 15:36:45,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:45,655 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-18 15:36:45,656 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 15:36:45,656 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-18 15:36:45,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 15:36:45,656 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:45,657 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:45,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 15:36:45,657 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:45,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:45,657 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-18 15:36:45,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:45,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [139545066] [2020-08-18 15:36:45,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:45,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:46,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:46,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:46,399 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 0 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:46,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [139545066] [2020-08-18 15:36:46,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:46,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 15:36:46,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191118982] [2020-08-18 15:36:46,401 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 15:36:46,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:46,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 15:36:46,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-18 15:36:46,405 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-18 15:36:47,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:47,690 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-18 15:36:47,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 15:36:47,691 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-18 15:36:47,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:47,692 INFO L225 Difference]: With dead ends: 99 [2020-08-18 15:36:47,692 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 15:36:47,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-08-18 15:36:47,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 15:36:47,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-18 15:36:47,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-18 15:36:47,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-18 15:36:47,703 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-18 15:36:47,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:47,703 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-18 15:36:47,703 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 15:36:47,704 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-18 15:36:47,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-18 15:36:47,705 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:47,705 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:47,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 15:36:47,705 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:47,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:47,706 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-18 15:36:47,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:47,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [213401010] [2020-08-18 15:36:47,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:47,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:48,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:48,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:48,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 1134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:48,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [213401010] [2020-08-18 15:36:48,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:48,596 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 15:36:48,596 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717764391] [2020-08-18 15:36:48,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 15:36:48,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:48,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 15:36:48,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-18 15:36:48,598 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-18 15:36:49,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:49,735 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-18 15:36:49,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 15:36:49,736 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-18 15:36:49,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:49,737 INFO L225 Difference]: With dead ends: 102 [2020-08-18 15:36:49,737 INFO L226 Difference]: Without dead ends: 97 [2020-08-18 15:36:49,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 15:36:49,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-18 15:36:49,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-18 15:36:49,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 15:36:49,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-18 15:36:49,746 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-18 15:36:49,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:49,746 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-18 15:36:49,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 15:36:49,747 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-18 15:36:49,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 15:36:49,747 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:49,748 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:49,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 15:36:49,748 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:49,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:49,748 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-18 15:36:49,749 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:49,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [626859080] [2020-08-18 15:36:49,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:49,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:50,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:50,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:50,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:50,474 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [626859080] [2020-08-18 15:36:50,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:50,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 15:36:50,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396314369] [2020-08-18 15:36:50,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 15:36:50,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:50,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 15:36:50,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 15:36:50,477 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-18 15:36:51,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:51,667 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-18 15:36:51,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 15:36:51,667 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-18 15:36:51,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:51,669 INFO L225 Difference]: With dead ends: 105 [2020-08-18 15:36:51,669 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 15:36:51,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 15:36:51,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 15:36:51,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-18 15:36:51,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-18 15:36:51,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-18 15:36:51,679 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-18 15:36:51,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:51,679 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-18 15:36:51,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 15:36:51,679 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-18 15:36:51,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-18 15:36:51,680 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:51,680 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:51,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 15:36:51,681 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:51,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:51,681 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-18 15:36:51,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:51,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419788892] [2020-08-18 15:36:51,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:51,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:52,445 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:52,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:52,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:52,474 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419788892] [2020-08-18 15:36:52,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:52,474 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 15:36:52,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059412110] [2020-08-18 15:36:52,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 15:36:52,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:52,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 15:36:52,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 15:36:52,475 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-18 15:36:53,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:53,765 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-18 15:36:53,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 15:36:53,766 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-18 15:36:53,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:53,768 INFO L225 Difference]: With dead ends: 108 [2020-08-18 15:36:53,768 INFO L226 Difference]: Without dead ends: 103 [2020-08-18 15:36:53,769 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 15:36:53,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-18 15:36:53,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-18 15:36:53,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 15:36:53,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-18 15:36:53,777 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-18 15:36:53,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:53,777 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-18 15:36:53,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 15:36:53,778 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-18 15:36:53,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 15:36:53,778 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:53,779 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:53,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 15:36:53,779 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:53,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:53,779 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-18 15:36:53,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:53,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1429047549] [2020-08-18 15:36:53,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:53,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:54,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:54,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:54,627 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 0 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:54,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1429047549] [2020-08-18 15:36:54,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:54,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 15:36:54,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444467559] [2020-08-18 15:36:54,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 15:36:54,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:54,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 15:36:54,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 15:36:54,629 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-18 15:36:56,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:56,020 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-18 15:36:56,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 15:36:56,027 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-18 15:36:56,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:56,029 INFO L225 Difference]: With dead ends: 111 [2020-08-18 15:36:56,029 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 15:36:56,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 15:36:56,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 15:36:56,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-18 15:36:56,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-18 15:36:56,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-18 15:36:56,039 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-18 15:36:56,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:56,039 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-18 15:36:56,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 15:36:56,039 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-18 15:36:56,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-18 15:36:56,040 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:56,040 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:56,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 15:36:56,041 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:56,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:56,041 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-18 15:36:56,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:56,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [620051474] [2020-08-18 15:36:56,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:56,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:56,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:56,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:56,926 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 0 proven. 1488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:56,927 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [620051474] [2020-08-18 15:36:56,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:56,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 15:36:56,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313968996] [2020-08-18 15:36:56,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 15:36:56,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:56,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 15:36:56,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 15:36:56,929 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-18 15:36:58,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:36:58,401 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-18 15:36:58,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 15:36:58,402 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-18 15:36:58,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:36:58,403 INFO L225 Difference]: With dead ends: 114 [2020-08-18 15:36:58,404 INFO L226 Difference]: Without dead ends: 109 [2020-08-18 15:36:58,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 15:36:58,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-18 15:36:58,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-18 15:36:58,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 15:36:58,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-18 15:36:58,414 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-18 15:36:58,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:36:58,414 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-18 15:36:58,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 15:36:58,414 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-18 15:36:58,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-18 15:36:58,415 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:36:58,416 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:36:58,416 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 15:36:58,416 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:36:58,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:36:58,416 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-18 15:36:58,417 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:36:58,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [799329071] [2020-08-18 15:36:58,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:36:58,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:59,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:36:59,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:36:59,338 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:36:59,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [799329071] [2020-08-18 15:36:59,338 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:36:59,338 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 15:36:59,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359878831] [2020-08-18 15:36:59,339 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 15:36:59,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:36:59,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 15:36:59,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 15:36:59,340 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-18 15:37:00,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:37:00,893 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-18 15:37:00,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 15:37:00,894 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-18 15:37:00,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:37:00,895 INFO L225 Difference]: With dead ends: 117 [2020-08-18 15:37:00,896 INFO L226 Difference]: Without dead ends: 112 [2020-08-18 15:37:00,897 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 15:37:00,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-18 15:37:00,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-18 15:37:00,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-18 15:37:00,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-18 15:37:00,906 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-18 15:37:00,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:37:00,907 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-18 15:37:00,907 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 15:37:00,907 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-18 15:37:00,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-18 15:37:00,908 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:37:00,908 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:37:00,908 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 15:37:00,909 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:37:00,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:37:00,909 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-18 15:37:00,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:37:00,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1514729226] [2020-08-18 15:37:00,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:37:00,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:01,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:37:01,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:01,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 0 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:37:01,896 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1514729226] [2020-08-18 15:37:01,896 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:37:01,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 15:37:01,896 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780730276] [2020-08-18 15:37:01,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 15:37:01,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:37:01,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 15:37:01,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 15:37:01,897 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-18 15:37:03,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:37:03,571 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-18 15:37:03,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 15:37:03,572 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-18 15:37:03,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:37:03,573 INFO L225 Difference]: With dead ends: 120 [2020-08-18 15:37:03,573 INFO L226 Difference]: Without dead ends: 115 [2020-08-18 15:37:03,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 15:37:03,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-18 15:37:03,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-18 15:37:03,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-18 15:37:03,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-18 15:37:03,582 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-18 15:37:03,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:37:03,583 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-18 15:37:03,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 15:37:03,583 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-18 15:37:03,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-18 15:37:03,584 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:37:03,584 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:37:03,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 15:37:03,584 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:37:03,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:37:03,585 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-18 15:37:03,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:37:03,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [932043213] [2020-08-18 15:37:03,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:37:03,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:04,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:37:04,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:04,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 0 proven. 1785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:37:04,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [932043213] [2020-08-18 15:37:04,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:37:04,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 15:37:04,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846602048] [2020-08-18 15:37:04,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 15:37:04,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:37:04,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 15:37:04,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 15:37:04,581 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-18 15:37:06,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:37:06,336 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-18 15:37:06,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 15:37:06,337 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-18 15:37:06,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:37:06,338 INFO L225 Difference]: With dead ends: 123 [2020-08-18 15:37:06,339 INFO L226 Difference]: Without dead ends: 118 [2020-08-18 15:37:06,340 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 15:37:06,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-18 15:37:06,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-18 15:37:06,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-18 15:37:06,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-18 15:37:06,349 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-18 15:37:06,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:37:06,350 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-18 15:37:06,350 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 15:37:06,350 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-18 15:37:06,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-18 15:37:06,351 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:37:06,351 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:37:06,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 15:37:06,351 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:37:06,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:37:06,352 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-18 15:37:06,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:37:06,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [865716313] [2020-08-18 15:37:06,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:37:06,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:07,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:37:07,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:07,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 0 proven. 1890 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:37:07,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [865716313] [2020-08-18 15:37:07,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:37:07,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 15:37:07,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65346133] [2020-08-18 15:37:07,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 15:37:07,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:37:07,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 15:37:07,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 15:37:07,462 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-18 15:37:09,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:37:09,310 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-18 15:37:09,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 15:37:09,311 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-18 15:37:09,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:37:09,312 INFO L225 Difference]: With dead ends: 126 [2020-08-18 15:37:09,312 INFO L226 Difference]: Without dead ends: 121 [2020-08-18 15:37:09,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 15:37:09,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-18 15:37:09,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-18 15:37:09,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-18 15:37:09,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-18 15:37:09,323 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-18 15:37:09,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:37:09,323 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-18 15:37:09,324 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 15:37:09,324 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-18 15:37:09,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-18 15:37:09,324 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:37:09,324 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:37:09,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 15:37:09,325 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:37:09,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:37:09,325 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-18 15:37:09,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:37:09,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1346591984] [2020-08-18 15:37:09,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:37:09,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:10,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:37:10,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:10,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 0 proven. 1998 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:37:10,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1346591984] [2020-08-18 15:37:10,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:37:10,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 15:37:10,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521158089] [2020-08-18 15:37:10,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 15:37:10,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:37:10,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 15:37:10,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 15:37:10,467 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-18 15:37:12,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:37:12,403 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-18 15:37:12,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 15:37:12,404 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-18 15:37:12,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:37:12,405 INFO L225 Difference]: With dead ends: 129 [2020-08-18 15:37:12,406 INFO L226 Difference]: Without dead ends: 124 [2020-08-18 15:37:12,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 15:37:12,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-18 15:37:12,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-18 15:37:12,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-18 15:37:12,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-18 15:37:12,417 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-18 15:37:12,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:37:12,417 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-18 15:37:12,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 15:37:12,418 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-18 15:37:12,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-18 15:37:12,418 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:37:12,418 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:37:12,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 15:37:12,419 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:37:12,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:37:12,419 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-18 15:37:12,419 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:37:12,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240106199] [2020-08-18 15:37:12,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:37:12,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:13,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:37:13,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:13,648 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:37:13,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1240106199] [2020-08-18 15:37:13,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:37:13,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 15:37:13,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450632389] [2020-08-18 15:37:13,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 15:37:13,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:37:13,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 15:37:13,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 15:37:13,650 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-08-18 15:37:15,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:37:15,735 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-08-18 15:37:15,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 15:37:15,735 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-08-18 15:37:15,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:37:15,737 INFO L225 Difference]: With dead ends: 132 [2020-08-18 15:37:15,737 INFO L226 Difference]: Without dead ends: 127 [2020-08-18 15:37:15,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 15:37:15,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-18 15:37:15,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-08-18 15:37:15,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-18 15:37:15,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-08-18 15:37:15,748 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-08-18 15:37:15,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:37:15,749 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-08-18 15:37:15,749 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 15:37:15,749 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-08-18 15:37:15,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-18 15:37:15,749 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:37:15,750 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:37:15,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 15:37:15,750 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:37:15,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:37:15,750 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-08-18 15:37:15,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:37:15,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2137063169] [2020-08-18 15:37:15,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:37:15,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:17,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:37:17,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:17,047 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 0 proven. 2223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:37:17,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2137063169] [2020-08-18 15:37:17,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:37:17,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 15:37:17,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764394071] [2020-08-18 15:37:17,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 15:37:17,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:37:17,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 15:37:17,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 15:37:17,048 INFO L87 Difference]: Start difference. First operand 127 states and 166 transitions. Second operand 43 states. [2020-08-18 15:37:19,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:37:19,261 INFO L93 Difference]: Finished difference Result 135 states and 175 transitions. [2020-08-18 15:37:19,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 15:37:19,262 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 126 [2020-08-18 15:37:19,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:37:19,264 INFO L225 Difference]: With dead ends: 135 [2020-08-18 15:37:19,264 INFO L226 Difference]: Without dead ends: 130 [2020-08-18 15:37:19,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 15:37:19,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-18 15:37:19,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2020-08-18 15:37:19,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-08-18 15:37:19,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2020-08-18 15:37:19,274 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 126 [2020-08-18 15:37:19,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:37:19,275 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2020-08-18 15:37:19,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 15:37:19,275 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2020-08-18 15:37:19,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-18 15:37:19,275 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:37:19,276 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:37:19,276 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 15:37:19,276 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:37:19,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:37:19,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1493345097, now seen corresponding path program 39 times [2020-08-18 15:37:19,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:37:19,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1399938885] [2020-08-18 15:37:19,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:37:19,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:20,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:37:20,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:20,621 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 0 proven. 2340 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:37:20,622 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1399938885] [2020-08-18 15:37:20,622 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:37:20,622 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 15:37:20,622 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716969029] [2020-08-18 15:37:20,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 15:37:20,623 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:37:20,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 15:37:20,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 15:37:20,624 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand 44 states. [2020-08-18 15:37:22,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:37:22,921 INFO L93 Difference]: Finished difference Result 138 states and 179 transitions. [2020-08-18 15:37:22,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 15:37:22,922 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 129 [2020-08-18 15:37:22,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:37:22,924 INFO L225 Difference]: With dead ends: 138 [2020-08-18 15:37:22,924 INFO L226 Difference]: Without dead ends: 133 [2020-08-18 15:37:22,925 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=89, Invalid=1891, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 15:37:22,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-18 15:37:22,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2020-08-18 15:37:22,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-18 15:37:22,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 174 transitions. [2020-08-18 15:37:22,937 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 174 transitions. Word has length 129 [2020-08-18 15:37:22,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:37:22,937 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 174 transitions. [2020-08-18 15:37:22,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 15:37:22,938 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 174 transitions. [2020-08-18 15:37:22,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-18 15:37:22,939 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:37:22,939 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:37:22,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 15:37:22,939 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:37:22,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:37:22,940 INFO L82 PathProgramCache]: Analyzing trace with hash 500148978, now seen corresponding path program 40 times [2020-08-18 15:37:22,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:37:22,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1827317416] [2020-08-18 15:37:22,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:37:22,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:24,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:37:24,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:37:24,384 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 0 proven. 2460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:37:24,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1827317416] [2020-08-18 15:37:24,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:37:24,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 15:37:24,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507407569] [2020-08-18 15:37:24,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 15:37:24,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:37:24,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 15:37:24,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 15:37:24,386 INFO L87 Difference]: Start difference. First operand 133 states and 174 transitions. Second operand 45 states.