/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true -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 16:24:36,698 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-18 16:24:36,732 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 16:24:36,733 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 16:24:36,734 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 16:24:36,736 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 16:24:36,738 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 16:24:36,739 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 16:24:36,740 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 16:24:36,741 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 16:24:36,741 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 16:24:36,742 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 16:24:36,743 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 16:24:36,744 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 16:24:36,745 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 16:24:36,746 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 16:24:36,748 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 16:24:36,750 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 16:24:36,752 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 16:24:36,753 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 16:24:36,754 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 16:24:36,755 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 16:24:36,758 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 16:24:36,765 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 16:24:36,766 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 16:24:36,767 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 16:24:36,768 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 16:24:36,798 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 16:24:36,798 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 16:24:36,799 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 16:24:36,799 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 16:24:36,799 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 16:24:36,800 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 16:24:36,800 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 16:24:36,800 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 16:24:36,800 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 16:24:36,800 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 16:24:36,801 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 16:24:36,801 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 16:24:36,801 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 16:24:36,801 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 16:24:36,801 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 16:24:36,802 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 16:24:36,802 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 16:24:36,802 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 16:24:36,802 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 16:24:36,802 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 16:24:36,803 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 16:24:36,803 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 16:24:36,803 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 16:24:36,803 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 16:24:36,803 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 16:24:36,804 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 16:24:36,804 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 16:24:36,804 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 16:24:36,804 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 16:24:36,804 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true [2020-08-18 16:24:37,143 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 16:24:37,160 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 16:24:37,164 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 16:24:37,166 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 16:24:37,168 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 16:24:37,169 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-18 16:24:37,248 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8722f1730/6977b05ec05c4918a690fce70eac713a/FLAG8ea06efd1 [2020-08-18 16:24:37,705 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 16:24:37,706 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-18 16:24:37,712 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8722f1730/6977b05ec05c4918a690fce70eac713a/FLAG8ea06efd1 [2020-08-18 16:24:38,075 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8722f1730/6977b05ec05c4918a690fce70eac713a [2020-08-18 16:24:38,084 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 16:24:38,085 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 16:24:38,086 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 16:24:38,086 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 16:24:38,090 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 16:24:38,091 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:24:38" (1/1) ... [2020-08-18 16:24:38,094 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@36345b5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:38, skipping insertion in model container [2020-08-18 16:24:38,094 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:24:38" (1/1) ... [2020-08-18 16:24:38,102 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 16:24:38,121 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 16:24:38,281 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:24:38,285 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 16:24:38,302 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:24:38,317 INFO L208 MainTranslator]: Completed translation [2020-08-18 16:24:38,317 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:38 WrapperNode [2020-08-18 16:24:38,317 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 16:24:38,318 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 16:24:38,318 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 16:24:38,319 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 16:24:38,332 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:38" (1/1) ... [2020-08-18 16:24:38,332 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:38" (1/1) ... [2020-08-18 16:24:38,337 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:38" (1/1) ... [2020-08-18 16:24:38,338 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:38" (1/1) ... [2020-08-18 16:24:38,341 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:38" (1/1) ... [2020-08-18 16:24:38,345 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:38" (1/1) ... [2020-08-18 16:24:38,346 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:38" (1/1) ... [2020-08-18 16:24:38,424 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 16:24:38,424 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 16:24:38,424 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 16:24:38,425 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 16:24:38,425 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:38" (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 16:24:38,491 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 16:24:38,492 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 16:24:38,492 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 16:24:38,492 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 16:24:38,492 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 16:24:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 16:24:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 16:24:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 16:24:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 16:24:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 16:24:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 16:24:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 16:24:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 16:24:38,679 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 16:24:38,680 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 16:24:38,684 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:24:38 BoogieIcfgContainer [2020-08-18 16:24:38,684 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 16:24:38,695 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 16:24:38,702 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 16:24:38,710 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 16:24:38,714 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 04:24:38" (1/3) ... [2020-08-18 16:24:38,716 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@296790fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:24:38, skipping insertion in model container [2020-08-18 16:24:38,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:38" (2/3) ... [2020-08-18 16:24:38,720 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@296790fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:24:38, skipping insertion in model container [2020-08-18 16:24:38,720 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:24:38" (3/3) ... [2020-08-18 16:24:38,722 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-18 16:24:38,756 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 16:24:38,771 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 16:24:38,805 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 16:24:38,836 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 16:24:38,836 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 16:24:38,836 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 16:24:38,836 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 16:24:38,836 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 16:24:38,837 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 16:24:38,837 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 16:24:38,837 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 16:24:38,853 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-18 16:24:38,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 16:24:38,858 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:38,859 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:38,859 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:38,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:38,864 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-18 16:24:38,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:38,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [758083035] [2020-08-18 16:24:38,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:38,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:38,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:38,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:38,973 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 16:24:38,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [758083035] [2020-08-18 16:24:38,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:24:38,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 16:24:38,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521475112] [2020-08-18 16:24:38,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 16:24:38,983 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:38,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 16:24:38,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 16:24:38,999 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-18 16:24:39,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:39,018 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-18 16:24:39,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 16:24:39,019 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-18 16:24:39,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:39,026 INFO L225 Difference]: With dead ends: 32 [2020-08-18 16:24:39,026 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 16:24:39,030 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 16:24:39,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 16:24:39,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 16:24:39,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 16:24:39,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-18 16:24:39,070 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-18 16:24:39,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:39,070 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-18 16:24:39,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 16:24:39,071 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-18 16:24:39,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 16:24:39,072 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:39,072 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:39,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 16:24:39,073 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:39,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:39,073 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-18 16:24:39,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:39,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [754559531] [2020-08-18 16:24:39,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:39,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:39,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:39,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:39,198 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 16:24:39,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [754559531] [2020-08-18 16:24:39,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:24:39,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 16:24:39,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548094250] [2020-08-18 16:24:39,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 16:24:39,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:39,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 16:24:39,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:24:39,202 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-18 16:24:39,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:39,254 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-18 16:24:39,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 16:24:39,255 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 16:24:39,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:39,256 INFO L225 Difference]: With dead ends: 21 [2020-08-18 16:24:39,257 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 16:24:39,258 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 16:24:39,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 16:24:39,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 16:24:39,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 16:24:39,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 16:24:39,264 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-18 16:24:39,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:39,264 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 16:24:39,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 16:24:39,265 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 16:24:39,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 16:24:39,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:39,266 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:39,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 16:24:39,266 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:39,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:39,267 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-18 16:24:39,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:39,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1987064475] [2020-08-18 16:24:39,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:39,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:39,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:39,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:39,395 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 16:24:39,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1987064475] [2020-08-18 16:24:39,396 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:39,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 16:24:39,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139611185] [2020-08-18 16:24:39,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 16:24:39,397 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:39,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 16:24:39,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 16:24:39,398 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-18 16:24:39,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:39,461 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-18 16:24:39,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 16:24:39,462 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-18 16:24:39,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:39,463 INFO L225 Difference]: With dead ends: 24 [2020-08-18 16:24:39,463 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 16:24:39,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 16:24:39,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 16:24:39,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 16:24:39,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 16:24:39,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-18 16:24:39,470 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-18 16:24:39,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:39,471 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-18 16:24:39,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 16:24:39,471 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-18 16:24:39,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 16:24:39,472 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:39,472 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:39,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 16:24:39,473 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:39,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:39,474 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-18 16:24:39,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:39,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [733640469] [2020-08-18 16:24:39,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:39,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:39,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:39,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:39,565 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 16:24:39,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [733640469] [2020-08-18 16:24:39,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:39,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 16:24:39,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067444447] [2020-08-18 16:24:39,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 16:24:39,567 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:39,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 16:24:39,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 16:24:39,568 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-18 16:24:39,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:39,641 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-18 16:24:39,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 16:24:39,641 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-18 16:24:39,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:39,642 INFO L225 Difference]: With dead ends: 27 [2020-08-18 16:24:39,642 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 16:24:39,643 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 16:24:39,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 16:24:39,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 16:24:39,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 16:24:39,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-18 16:24:39,649 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-18 16:24:39,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:39,650 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-18 16:24:39,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 16:24:39,650 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-18 16:24:39,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 16:24:39,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:39,651 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:39,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 16:24:39,652 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:39,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:39,652 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-18 16:24:39,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:39,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1923059521] [2020-08-18 16:24:39,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:39,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:39,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:39,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:39,810 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 16:24:39,813 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1923059521] [2020-08-18 16:24:39,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:39,814 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 16:24:39,814 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515015136] [2020-08-18 16:24:39,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 16:24:39,815 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:39,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 16:24:39,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-18 16:24:39,816 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-18 16:24:39,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:39,907 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-18 16:24:39,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 16:24:39,908 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-18 16:24:39,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:39,909 INFO L225 Difference]: With dead ends: 30 [2020-08-18 16:24:39,909 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 16:24:39,910 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 16:24:39,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 16:24:39,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 16:24:39,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 16:24:39,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-18 16:24:39,916 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-18 16:24:39,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:39,917 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-18 16:24:39,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 16:24:39,917 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-18 16:24:39,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 16:24:39,918 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:39,918 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:39,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 16:24:39,918 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:39,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:39,919 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-18 16:24:39,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:39,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1861060415] [2020-08-18 16:24:39,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:39,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:40,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:40,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:40,074 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 16:24:40,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1861060415] [2020-08-18 16:24:40,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:40,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 16:24:40,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705620633] [2020-08-18 16:24:40,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 16:24:40,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:40,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 16:24:40,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-18 16:24:40,077 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-18 16:24:40,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:40,165 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-18 16:24:40,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 16:24:40,166 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-18 16:24:40,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:40,167 INFO L225 Difference]: With dead ends: 33 [2020-08-18 16:24:40,167 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 16:24:40,168 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 16:24:40,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 16:24:40,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 16:24:40,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 16:24:40,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-18 16:24:40,174 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-18 16:24:40,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:40,175 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-18 16:24:40,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 16:24:40,175 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-18 16:24:40,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 16:24:40,176 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:40,176 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:40,176 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 16:24:40,176 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:40,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:40,177 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-18 16:24:40,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:40,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653945914] [2020-08-18 16:24:40,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:40,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:40,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:40,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:40,323 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 16:24:40,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653945914] [2020-08-18 16:24:40,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:40,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 16:24:40,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797813968] [2020-08-18 16:24:40,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 16:24:40,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:40,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 16:24:40,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-18 16:24:40,326 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-18 16:24:40,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:40,428 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-18 16:24:40,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 16:24:40,428 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-18 16:24:40,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:40,429 INFO L225 Difference]: With dead ends: 36 [2020-08-18 16:24:40,430 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 16:24:40,430 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 16:24:40,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 16:24:40,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 16:24:40,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 16:24:40,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-18 16:24:40,437 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-18 16:24:40,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:40,437 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-18 16:24:40,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 16:24:40,438 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-18 16:24:40,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 16:24:40,439 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:40,439 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:40,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 16:24:40,439 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:40,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:40,440 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-18 16:24:40,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:40,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [834602884] [2020-08-18 16:24:40,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:40,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:40,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:40,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:40,576 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 16:24:40,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [834602884] [2020-08-18 16:24:40,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:40,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 16:24:40,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967616403] [2020-08-18 16:24:40,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 16:24:40,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:40,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 16:24:40,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-18 16:24:40,580 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-18 16:24:40,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:40,703 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-18 16:24:40,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 16:24:40,704 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 16:24:40,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:40,705 INFO L225 Difference]: With dead ends: 39 [2020-08-18 16:24:40,705 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 16:24:40,706 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 16:24:40,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 16:24:40,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 16:24:40,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 16:24:40,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-18 16:24:40,712 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-18 16:24:40,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:40,712 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-18 16:24:40,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 16:24:40,713 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-18 16:24:40,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 16:24:40,714 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:40,714 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:40,714 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 16:24:40,714 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:40,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:40,715 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-18 16:24:40,715 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:40,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198852629] [2020-08-18 16:24:40,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:40,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:40,905 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:40,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:40,925 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 16:24:40,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198852629] [2020-08-18 16:24:40,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:40,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 16:24:40,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036300581] [2020-08-18 16:24:40,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 16:24:40,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:40,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 16:24:40,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-18 16:24:40,934 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-18 16:24:41,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:41,124 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-18 16:24:41,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 16:24:41,125 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-18 16:24:41,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:41,126 INFO L225 Difference]: With dead ends: 42 [2020-08-18 16:24:41,126 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 16:24:41,127 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 16:24:41,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 16:24:41,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 16:24:41,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 16:24:41,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-18 16:24:41,137 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-18 16:24:41,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:41,138 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-18 16:24:41,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 16:24:41,138 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-18 16:24:41,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 16:24:41,139 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:41,139 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:41,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 16:24:41,140 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:41,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:41,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-18 16:24:41,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:41,141 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1626313787] [2020-08-18 16:24:41,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:41,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:41,291 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:41,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:41,296 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 16:24:41,296 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1626313787] [2020-08-18 16:24:41,296 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:41,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 16:24:41,297 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781457713] [2020-08-18 16:24:41,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 16:24:41,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:41,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 16:24:41,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 16:24:41,298 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-18 16:24:41,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:41,463 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-18 16:24:41,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 16:24:41,464 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 16:24:41,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:41,465 INFO L225 Difference]: With dead ends: 45 [2020-08-18 16:24:41,465 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 16:24:41,466 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 16:24:41,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 16:24:41,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 16:24:41,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 16:24:41,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-18 16:24:41,473 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-18 16:24:41,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:41,473 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-18 16:24:41,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 16:24:41,473 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-18 16:24:41,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 16:24:41,475 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:41,475 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:41,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 16:24:41,475 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:41,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:41,476 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-18 16:24:41,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:41,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1334538969] [2020-08-18 16:24:41,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:41,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:41,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:41,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:41,653 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 16:24:41,654 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1334538969] [2020-08-18 16:24:41,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:41,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 16:24:41,655 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14909859] [2020-08-18 16:24:41,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 16:24:41,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:41,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 16:24:41,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-18 16:24:41,658 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-18 16:24:41,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:41,850 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-18 16:24:41,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 16:24:41,851 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-18 16:24:41,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:41,852 INFO L225 Difference]: With dead ends: 48 [2020-08-18 16:24:41,852 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 16:24:41,853 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 16:24:41,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 16:24:41,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 16:24:41,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 16:24:41,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-18 16:24:41,860 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-18 16:24:41,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:41,860 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-18 16:24:41,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 16:24:41,861 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-18 16:24:41,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 16:24:41,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:41,862 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:41,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 16:24:41,862 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:41,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:41,863 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-18 16:24:41,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:41,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1339198023] [2020-08-18 16:24:41,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:41,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:42,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:42,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:42,067 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 16:24:42,068 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1339198023] [2020-08-18 16:24:42,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:42,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 16:24:42,069 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883622700] [2020-08-18 16:24:42,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 16:24:42,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:42,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 16:24:42,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-18 16:24:42,070 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-18 16:24:42,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:42,338 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-18 16:24:42,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 16:24:42,339 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-18 16:24:42,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:42,340 INFO L225 Difference]: With dead ends: 51 [2020-08-18 16:24:42,340 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 16:24:42,341 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 16:24:42,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 16:24:42,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 16:24:42,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 16:24:42,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-18 16:24:42,354 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-18 16:24:42,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:42,354 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-18 16:24:42,354 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 16:24:42,354 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-18 16:24:42,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 16:24:42,358 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:42,358 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:42,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 16:24:42,359 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:42,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:42,359 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-18 16:24:42,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:42,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1600824727] [2020-08-18 16:24:42,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:42,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:42,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:42,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:42,579 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 16:24:42,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1600824727] [2020-08-18 16:24:42,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:42,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 16:24:42,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503325513] [2020-08-18 16:24:42,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 16:24:42,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:42,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 16:24:42,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-18 16:24:42,581 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-18 16:24:42,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:42,863 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-18 16:24:42,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 16:24:42,864 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-18 16:24:42,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:42,865 INFO L225 Difference]: With dead ends: 54 [2020-08-18 16:24:42,865 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 16:24:42,866 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 16:24:42,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 16:24:42,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 16:24:42,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 16:24:42,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-18 16:24:42,873 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-18 16:24:42,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:42,873 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-18 16:24:42,873 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 16:24:42,873 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-18 16:24:42,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 16:24:42,874 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:42,874 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:42,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 16:24:42,874 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:42,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:42,875 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-18 16:24:42,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:42,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [608817351] [2020-08-18 16:24:42,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:42,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:43,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:43,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:43,114 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 16:24:43,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [608817351] [2020-08-18 16:24:43,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:43,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 16:24:43,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020227700] [2020-08-18 16:24:43,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 16:24:43,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:43,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 16:24:43,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-18 16:24:43,117 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-18 16:24:43,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:43,400 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-18 16:24:43,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 16:24:43,401 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 16:24:43,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:43,402 INFO L225 Difference]: With dead ends: 57 [2020-08-18 16:24:43,402 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 16:24:43,403 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 16:24:43,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 16:24:43,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 16:24:43,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 16:24:43,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-18 16:24:43,409 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-18 16:24:43,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:43,410 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-18 16:24:43,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 16:24:43,410 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-18 16:24:43,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 16:24:43,411 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:43,411 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:43,411 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 16:24:43,411 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:43,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:43,412 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-18 16:24:43,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:43,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567798638] [2020-08-18 16:24:43,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:43,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:43,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:43,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:43,647 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 16:24:43,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567798638] [2020-08-18 16:24:43,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:43,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 16:24:43,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160240695] [2020-08-18 16:24:43,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 16:24:43,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:43,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 16:24:43,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-18 16:24:43,649 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-18 16:24:43,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:43,949 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-18 16:24:43,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 16:24:43,950 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-18 16:24:43,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:43,950 INFO L225 Difference]: With dead ends: 60 [2020-08-18 16:24:43,951 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 16:24:43,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-18 16:24:43,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 16:24:43,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 16:24:43,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 16:24:43,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-18 16:24:43,967 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-18 16:24:43,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:43,968 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-18 16:24:43,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 16:24:43,968 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-18 16:24:43,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 16:24:43,969 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:43,969 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:43,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 16:24:43,970 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:43,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:43,970 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-18 16:24:43,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:43,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [364276049] [2020-08-18 16:24:43,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:43,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:44,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:44,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:44,273 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 16:24:44,274 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [364276049] [2020-08-18 16:24:44,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:44,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 16:24:44,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527825680] [2020-08-18 16:24:44,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 16:24:44,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:44,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 16:24:44,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-18 16:24:44,278 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-18 16:24:44,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:44,641 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-18 16:24:44,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 16:24:44,642 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-18 16:24:44,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:44,642 INFO L225 Difference]: With dead ends: 63 [2020-08-18 16:24:44,642 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 16:24:44,643 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 16:24:44,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 16:24:44,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 16:24:44,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 16:24:44,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-18 16:24:44,654 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-18 16:24:44,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:44,655 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-18 16:24:44,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 16:24:44,655 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-18 16:24:44,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 16:24:44,656 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:44,656 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:44,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 16:24:44,657 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:44,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:44,657 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-18 16:24:44,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:44,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1524319145] [2020-08-18 16:24:44,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:44,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:44,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:44,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:44,942 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 16:24:44,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1524319145] [2020-08-18 16:24:44,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:44,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 16:24:44,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491600720] [2020-08-18 16:24:44,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 16:24:44,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:44,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 16:24:44,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-18 16:24:44,946 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-18 16:24:45,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:45,326 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-18 16:24:45,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 16:24:45,326 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-18 16:24:45,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:45,328 INFO L225 Difference]: With dead ends: 66 [2020-08-18 16:24:45,328 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 16:24:45,329 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 16:24:45,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 16:24:45,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-18 16:24:45,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 16:24:45,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-18 16:24:45,335 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-18 16:24:45,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:45,335 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-18 16:24:45,335 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 16:24:45,336 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-18 16:24:45,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 16:24:45,336 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:45,337 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:45,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 16:24:45,337 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:45,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:45,338 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-18 16:24:45,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:45,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450686077] [2020-08-18 16:24:45,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:45,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:45,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:45,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:45,634 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 16:24:45,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450686077] [2020-08-18 16:24:45,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:45,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 16:24:45,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703901328] [2020-08-18 16:24:45,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 16:24:45,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:45,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 16:24:45,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-18 16:24:45,637 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-18 16:24:46,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:46,129 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-18 16:24:46,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 16:24:46,129 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-18 16:24:46,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:46,130 INFO L225 Difference]: With dead ends: 69 [2020-08-18 16:24:46,130 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 16:24:46,131 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 16:24:46,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 16:24:46,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-18 16:24:46,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 16:24:46,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-18 16:24:46,138 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-18 16:24:46,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:46,138 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-18 16:24:46,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 16:24:46,138 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-18 16:24:46,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 16:24:46,139 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:46,139 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:46,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 16:24:46,140 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:46,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:46,140 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-18 16:24:46,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:46,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1505638388] [2020-08-18 16:24:46,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:46,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:46,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:46,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:46,501 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 16:24:46,501 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1505638388] [2020-08-18 16:24:46,501 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:46,501 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 16:24:46,502 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974726795] [2020-08-18 16:24:46,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 16:24:46,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:46,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 16:24:46,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-18 16:24:46,503 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-18 16:24:46,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:47,000 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-18 16:24:47,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 16:24:47,000 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-18 16:24:47,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:47,001 INFO L225 Difference]: With dead ends: 72 [2020-08-18 16:24:47,001 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 16:24:47,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2020-08-18 16:24:47,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 16:24:47,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-18 16:24:47,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 16:24:47,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-18 16:24:47,010 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-18 16:24:47,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:47,010 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-18 16:24:47,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 16:24:47,010 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-18 16:24:47,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 16:24:47,011 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:47,011 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:47,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 16:24:47,012 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:47,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:47,012 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-18 16:24:47,012 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:47,012 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [697908580] [2020-08-18 16:24:47,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:47,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:47,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:47,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:47,351 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 16:24:47,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [697908580] [2020-08-18 16:24:47,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:47,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 16:24:47,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401855035] [2020-08-18 16:24:47,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 16:24:47,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:47,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 16:24:47,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-18 16:24:47,354 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-18 16:24:47,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:47,812 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-18 16:24:47,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 16:24:47,813 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-18 16:24:47,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:47,814 INFO L225 Difference]: With dead ends: 75 [2020-08-18 16:24:47,814 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 16:24:47,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2020-08-18 16:24:47,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 16:24:47,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-18 16:24:47,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 16:24:47,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-18 16:24:47,822 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-18 16:24:47,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:47,822 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-18 16:24:47,822 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 16:24:47,822 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-18 16:24:47,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 16:24:47,823 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:47,823 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:47,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 16:24:47,823 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:47,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:47,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-18 16:24:47,824 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:47,824 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127533920] [2020-08-18 16:24:47,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:47,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:48,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:48,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:48,231 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 16:24:48,232 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127533920] [2020-08-18 16:24:48,232 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:48,232 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 16:24:48,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600692708] [2020-08-18 16:24:48,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 16:24:48,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:48,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 16:24:48,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-18 16:24:48,234 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-18 16:24:48,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:48,836 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-18 16:24:48,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 16:24:48,837 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-18 16:24:48,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:48,838 INFO L225 Difference]: With dead ends: 78 [2020-08-18 16:24:48,838 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 16:24:48,839 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 16:24:48,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 16:24:48,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-18 16:24:48,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 16:24:48,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-18 16:24:48,845 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-18 16:24:48,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:48,846 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-18 16:24:48,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 16:24:48,846 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-18 16:24:48,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 16:24:48,847 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:48,847 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:48,847 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 16:24:48,847 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:48,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:48,848 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-18 16:24:48,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:48,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [745768077] [2020-08-18 16:24:48,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:48,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:49,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:49,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:49,246 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 16:24:49,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [745768077] [2020-08-18 16:24:49,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:49,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 16:24:49,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875716147] [2020-08-18 16:24:49,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 16:24:49,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:49,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 16:24:49,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-18 16:24:49,248 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-18 16:24:49,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:49,897 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-18 16:24:49,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 16:24:49,900 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-18 16:24:49,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:49,901 INFO L225 Difference]: With dead ends: 81 [2020-08-18 16:24:49,901 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 16:24:49,902 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 16:24:49,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 16:24:49,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-18 16:24:49,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 16:24:49,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-18 16:24:49,908 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-18 16:24:49,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:49,908 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-18 16:24:49,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 16:24:49,909 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-18 16:24:49,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 16:24:49,909 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:49,909 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:49,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 16:24:49,910 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:49,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:49,910 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-18 16:24:49,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:49,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [502852463] [2020-08-18 16:24:49,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:49,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:50,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:50,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:50,372 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 16:24:50,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [502852463] [2020-08-18 16:24:50,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:50,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 16:24:50,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479992496] [2020-08-18 16:24:50,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 16:24:50,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:50,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 16:24:50,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-18 16:24:50,374 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-18 16:24:51,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:51,087 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-18 16:24:51,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 16:24:51,087 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-18 16:24:51,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:51,089 INFO L225 Difference]: With dead ends: 84 [2020-08-18 16:24:51,089 INFO L226 Difference]: Without dead ends: 79 [2020-08-18 16:24:51,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-18 16:24:51,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-18 16:24:51,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-18 16:24:51,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 16:24:51,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-18 16:24:51,097 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-18 16:24:51,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:51,098 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-18 16:24:51,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 16:24:51,098 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-18 16:24:51,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 16:24:51,099 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:51,099 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:51,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 16:24:51,099 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:51,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:51,100 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-18 16:24:51,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:51,100 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [717352428] [2020-08-18 16:24:51,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:51,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:51,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:51,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:51,617 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 16:24:51,618 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [717352428] [2020-08-18 16:24:51,618 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:51,618 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 16:24:51,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701194344] [2020-08-18 16:24:51,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 16:24:51,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:51,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 16:24:51,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-18 16:24:51,619 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-18 16:24:52,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:52,392 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-18 16:24:52,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 16:24:52,397 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-18 16:24:52,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:52,398 INFO L225 Difference]: With dead ends: 87 [2020-08-18 16:24:52,399 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 16:24:52,399 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 16:24:52,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 16:24:52,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-18 16:24:52,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 16:24:52,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-18 16:24:52,405 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-18 16:24:52,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:52,406 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-18 16:24:52,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 16:24:52,406 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-18 16:24:52,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 16:24:52,407 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:52,407 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:52,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 16:24:52,407 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:52,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:52,408 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-18 16:24:52,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:52,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [815591890] [2020-08-18 16:24:52,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:52,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:52,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:52,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:52,893 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 16:24:52,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [815591890] [2020-08-18 16:24:52,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:52,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 16:24:52,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054764764] [2020-08-18 16:24:52,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 16:24:52,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:52,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 16:24:52,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-18 16:24:52,895 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-18 16:24:53,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:53,735 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-18 16:24:53,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 16:24:53,735 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-18 16:24:53,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:53,736 INFO L225 Difference]: With dead ends: 90 [2020-08-18 16:24:53,736 INFO L226 Difference]: Without dead ends: 85 [2020-08-18 16:24:53,737 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 16:24:53,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-18 16:24:53,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-18 16:24:53,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 16:24:53,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-18 16:24:53,745 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-18 16:24:53,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:53,745 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-18 16:24:53,745 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 16:24:53,745 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-18 16:24:53,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 16:24:53,746 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:53,747 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:53,747 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 16:24:53,747 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:53,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:53,747 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-18 16:24:53,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:53,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [141816012] [2020-08-18 16:24:53,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:53,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:54,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:54,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:54,319 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 16:24:54,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [141816012] [2020-08-18 16:24:54,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:54,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 16:24:54,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687569755] [2020-08-18 16:24:54,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 16:24:54,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:54,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 16:24:54,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-18 16:24:54,321 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-18 16:24:55,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:55,225 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-18 16:24:55,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 16:24:55,226 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-18 16:24:55,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:55,227 INFO L225 Difference]: With dead ends: 93 [2020-08-18 16:24:55,227 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 16:24:55,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-08-18 16:24:55,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 16:24:55,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-18 16:24:55,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 16:24:55,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-18 16:24:55,234 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-18 16:24:55,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:55,235 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-18 16:24:55,235 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 16:24:55,235 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-18 16:24:55,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 16:24:55,236 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:55,236 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:55,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 16:24:55,236 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:55,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:55,237 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-18 16:24:55,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:55,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1975503741] [2020-08-18 16:24:55,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:55,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:55,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:55,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:55,847 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 16:24:55,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1975503741] [2020-08-18 16:24:55,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:55,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 16:24:55,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075555567] [2020-08-18 16:24:55,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 16:24:55,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:55,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 16:24:55,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-18 16:24:55,849 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-18 16:24:56,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:56,816 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-18 16:24:56,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 16:24:56,817 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-18 16:24:56,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:56,819 INFO L225 Difference]: With dead ends: 96 [2020-08-18 16:24:56,819 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 16:24:56,820 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 16:24:56,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 16:24:56,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-18 16:24:56,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 16:24:56,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-18 16:24:56,827 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-18 16:24:56,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:56,827 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-18 16:24:56,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 16:24:56,827 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-18 16:24:56,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 16:24:56,828 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:56,828 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:56,828 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 16:24:56,829 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:56,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:56,829 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-18 16:24:56,829 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:56,829 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1508259542] [2020-08-18 16:24:56,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:56,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:57,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:57,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:57,467 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 16:24:57,468 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1508259542] [2020-08-18 16:24:57,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:57,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 16:24:57,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062471162] [2020-08-18 16:24:57,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 16:24:57,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:57,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 16:24:57,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-18 16:24:57,470 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-18 16:24:58,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:58,518 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-18 16:24:58,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 16:24:58,519 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-18 16:24:58,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:58,520 INFO L225 Difference]: With dead ends: 99 [2020-08-18 16:24:58,520 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 16:24:58,521 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-08-18 16:24:58,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 16:24:58,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-18 16:24:58,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-18 16:24:58,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-18 16:24:58,529 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-18 16:24:58,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:58,529 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-18 16:24:58,529 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 16:24:58,529 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-18 16:24:58,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-18 16:24:58,530 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:58,530 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:58,530 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 16:24:58,530 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:58,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:58,531 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-18 16:24:58,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:58,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [916604581] [2020-08-18 16:24:58,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:58,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:59,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:59,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:59,245 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 16:24:59,245 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [916604581] [2020-08-18 16:24:59,245 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:59,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 16:24:59,246 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702021962] [2020-08-18 16:24:59,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 16:24:59,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:59,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 16:24:59,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-18 16:24:59,247 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-18 16:25:00,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:00,542 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-18 16:25:00,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 16:25:00,543 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-18 16:25:00,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:00,545 INFO L225 Difference]: With dead ends: 102 [2020-08-18 16:25:00,545 INFO L226 Difference]: Without dead ends: 97 [2020-08-18 16:25:00,547 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 16:25:00,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-18 16:25:00,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-18 16:25:00,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 16:25:00,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-18 16:25:00,563 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-18 16:25:00,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:00,564 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-18 16:25:00,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 16:25:00,564 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-18 16:25:00,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 16:25:00,566 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:00,566 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:00,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 16:25:00,567 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:00,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:00,567 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-18 16:25:00,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:00,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1208684739] [2020-08-18 16:25:00,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:00,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:01,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:01,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:01,435 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 16:25:01,435 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1208684739] [2020-08-18 16:25:01,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:01,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 16:25:01,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210428771] [2020-08-18 16:25:01,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 16:25:01,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:01,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 16:25:01,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 16:25:01,437 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-18 16:25:02,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:02,658 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-18 16:25:02,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 16:25:02,659 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-18 16:25:02,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:02,660 INFO L225 Difference]: With dead ends: 105 [2020-08-18 16:25:02,660 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 16:25:02,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 16:25:02,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 16:25:02,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-18 16:25:02,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-18 16:25:02,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-18 16:25:02,670 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-18 16:25:02,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:02,670 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-18 16:25:02,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 16:25:02,671 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-18 16:25:02,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-18 16:25:02,671 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:02,672 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:02,672 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 16:25:02,672 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:02,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:02,672 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-18 16:25:02,673 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:02,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [546563931] [2020-08-18 16:25:02,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:02,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:03,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:03,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:03,493 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 16:25:03,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [546563931] [2020-08-18 16:25:03,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:03,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 16:25:03,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163029774] [2020-08-18 16:25:03,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 16:25:03,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:03,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 16:25:03,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 16:25:03,495 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-18 16:25:04,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:04,780 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-18 16:25:04,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 16:25:04,780 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-18 16:25:04,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:04,782 INFO L225 Difference]: With dead ends: 108 [2020-08-18 16:25:04,782 INFO L226 Difference]: Without dead ends: 103 [2020-08-18 16:25:04,783 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 16:25:04,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-18 16:25:04,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-18 16:25:04,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 16:25:04,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-18 16:25:04,791 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-18 16:25:04,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:04,792 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-18 16:25:04,792 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 16:25:04,792 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-18 16:25:04,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 16:25:04,793 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:04,793 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:04,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 16:25:04,794 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:04,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:04,794 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-18 16:25:04,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:04,794 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [57440932] [2020-08-18 16:25:04,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:04,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:05,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:05,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:05,586 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 16:25:05,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [57440932] [2020-08-18 16:25:05,587 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:05,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 16:25:05,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6886310] [2020-08-18 16:25:05,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 16:25:05,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:05,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 16:25:05,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 16:25:05,589 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-18 16:25:06,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:06,922 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-18 16:25:06,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 16:25:06,927 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-18 16:25:06,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:06,928 INFO L225 Difference]: With dead ends: 111 [2020-08-18 16:25:06,928 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 16:25:06,929 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 16:25:06,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 16:25:06,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-18 16:25:06,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-18 16:25:06,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-18 16:25:06,942 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-18 16:25:06,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:06,942 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-18 16:25:06,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 16:25:06,943 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-18 16:25:06,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-18 16:25:06,943 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:06,944 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:06,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 16:25:06,944 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:06,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:06,944 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-18 16:25:06,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:06,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2008316637] [2020-08-18 16:25:06,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:06,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:07,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:07,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:07,784 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 16:25:07,784 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2008316637] [2020-08-18 16:25:07,784 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:07,784 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 16:25:07,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714836796] [2020-08-18 16:25:07,785 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 16:25:07,785 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:07,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 16:25:07,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 16:25:07,785 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-18 16:25:09,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:09,236 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-18 16:25:09,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 16:25:09,237 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-18 16:25:09,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:09,238 INFO L225 Difference]: With dead ends: 114 [2020-08-18 16:25:09,238 INFO L226 Difference]: Without dead ends: 109 [2020-08-18 16:25:09,239 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 16:25:09,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-18 16:25:09,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-18 16:25:09,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 16:25:09,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-18 16:25:09,248 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-18 16:25:09,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:09,249 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-18 16:25:09,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 16:25:09,249 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-18 16:25:09,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-18 16:25:09,250 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:09,250 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:09,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 16:25:09,250 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:09,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:09,251 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-18 16:25:09,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:09,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642347042] [2020-08-18 16:25:09,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:09,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:10,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:10,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:10,147 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 16:25:10,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642347042] [2020-08-18 16:25:10,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:10,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 16:25:10,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815901907] [2020-08-18 16:25:10,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 16:25:10,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:10,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 16:25:10,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 16:25:10,149 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-18 16:25:11,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:11,691 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-18 16:25:11,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 16:25:11,691 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-18 16:25:11,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:11,693 INFO L225 Difference]: With dead ends: 117 [2020-08-18 16:25:11,693 INFO L226 Difference]: Without dead ends: 112 [2020-08-18 16:25:11,694 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 16:25:11,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-18 16:25:11,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-18 16:25:11,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-18 16:25:11,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-18 16:25:11,708 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-18 16:25:11,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:11,708 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-18 16:25:11,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 16:25:11,709 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-18 16:25:11,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-18 16:25:11,710 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:11,710 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:11,710 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 16:25:11,710 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:11,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:11,711 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-18 16:25:11,711 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:11,713 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118692472] [2020-08-18 16:25:11,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:11,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:12,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:12,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:12,706 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 16:25:12,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118692472] [2020-08-18 16:25:12,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:12,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 16:25:12,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109264681] [2020-08-18 16:25:12,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 16:25:12,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:12,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 16:25:12,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 16:25:12,709 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-18 16:25:14,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:14,303 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-18 16:25:14,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 16:25:14,304 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-18 16:25:14,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:14,306 INFO L225 Difference]: With dead ends: 120 [2020-08-18 16:25:14,306 INFO L226 Difference]: Without dead ends: 115 [2020-08-18 16:25:14,307 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 16:25:14,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-18 16:25:14,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-18 16:25:14,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-18 16:25:14,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-18 16:25:14,316 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-18 16:25:14,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:14,317 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-18 16:25:14,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 16:25:14,317 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-18 16:25:14,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-18 16:25:14,318 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:14,318 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:14,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 16:25:14,319 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:14,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:14,319 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-18 16:25:14,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:14,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [49211669] [2020-08-18 16:25:14,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:14,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:15,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:15,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:15,346 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 16:25:15,346 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [49211669] [2020-08-18 16:25:15,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:15,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 16:25:15,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75438926] [2020-08-18 16:25:15,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 16:25:15,347 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:15,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 16:25:15,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 16:25:15,348 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-18 16:25:17,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:17,094 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-18 16:25:17,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 16:25:17,094 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-18 16:25:17,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:17,096 INFO L225 Difference]: With dead ends: 123 [2020-08-18 16:25:17,096 INFO L226 Difference]: Without dead ends: 118 [2020-08-18 16:25:17,097 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 16:25:17,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-18 16:25:17,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-18 16:25:17,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-18 16:25:17,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-18 16:25:17,107 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-18 16:25:17,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:17,108 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-18 16:25:17,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 16:25:17,108 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-18 16:25:17,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-18 16:25:17,109 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:17,110 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:17,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 16:25:17,110 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:17,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:17,110 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-18 16:25:17,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:17,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [178033978] [2020-08-18 16:25:17,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:17,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:18,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:18,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:18,130 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 16:25:18,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [178033978] [2020-08-18 16:25:18,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:18,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 16:25:18,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114755373] [2020-08-18 16:25:18,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 16:25:18,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:18,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 16:25:18,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 16:25:18,132 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-18 16:25:19,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:19,916 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-18 16:25:19,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 16:25:19,917 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-18 16:25:19,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:19,918 INFO L225 Difference]: With dead ends: 126 [2020-08-18 16:25:19,918 INFO L226 Difference]: Without dead ends: 121 [2020-08-18 16:25:19,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 16:25:19,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-18 16:25:19,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-18 16:25:19,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-18 16:25:19,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-18 16:25:19,931 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-18 16:25:19,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:19,931 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-18 16:25:19,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 16:25:19,931 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-18 16:25:19,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-18 16:25:19,934 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:19,934 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:19,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 16:25:19,934 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:19,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:19,934 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-18 16:25:19,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:19,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1208817981] [2020-08-18 16:25:19,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:19,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:21,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:21,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:21,090 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 16:25:21,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1208817981] [2020-08-18 16:25:21,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:21,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 16:25:21,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708774162] [2020-08-18 16:25:21,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 16:25:21,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:21,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 16:25:21,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 16:25:21,093 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-18 16:25:23,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:23,010 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-18 16:25:23,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 16:25:23,011 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-18 16:25:23,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:23,012 INFO L225 Difference]: With dead ends: 129 [2020-08-18 16:25:23,013 INFO L226 Difference]: Without dead ends: 124 [2020-08-18 16:25:23,014 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 16:25:23,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-18 16:25:23,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-18 16:25:23,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-18 16:25:23,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-18 16:25:23,024 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-18 16:25:23,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:23,024 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-18 16:25:23,024 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 16:25:23,024 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-18 16:25:23,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-18 16:25:23,025 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:23,025 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:23,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 16:25:23,025 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:23,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:23,026 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-18 16:25:23,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:23,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [400187542] [2020-08-18 16:25:23,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:23,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:24,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:24,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:24,257 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 16:25:24,258 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [400187542] [2020-08-18 16:25:24,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:24,258 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 16:25:24,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871297036] [2020-08-18 16:25:24,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 16:25:24,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:24,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 16:25:24,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 16:25:24,260 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-08-18 16:25:26,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:26,280 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-08-18 16:25:26,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 16:25:26,280 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-08-18 16:25:26,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:26,282 INFO L225 Difference]: With dead ends: 132 [2020-08-18 16:25:26,282 INFO L226 Difference]: Without dead ends: 127 [2020-08-18 16:25:26,283 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 16:25:26,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-18 16:25:26,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-08-18 16:25:26,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-18 16:25:26,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-08-18 16:25:26,295 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-08-18 16:25:26,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:26,296 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-08-18 16:25:26,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 16:25:26,296 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-08-18 16:25:26,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-18 16:25:26,297 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:26,297 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:26,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 16:25:26,297 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:26,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:26,298 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-08-18 16:25:26,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:26,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [333392006] [2020-08-18 16:25:26,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:26,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:27,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:27,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:27,586 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 16:25:27,587 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [333392006] [2020-08-18 16:25:27,587 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:27,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 16:25:27,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854147037] [2020-08-18 16:25:27,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 16:25:27,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:27,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 16:25:27,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 16:25:27,590 INFO L87 Difference]: Start difference. First operand 127 states and 166 transitions. Second operand 43 states. [2020-08-18 16:25:29,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:29,716 INFO L93 Difference]: Finished difference Result 135 states and 175 transitions. [2020-08-18 16:25:29,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 16:25:29,717 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 126 [2020-08-18 16:25:29,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:29,718 INFO L225 Difference]: With dead ends: 135 [2020-08-18 16:25:29,718 INFO L226 Difference]: Without dead ends: 130 [2020-08-18 16:25:29,719 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 16:25:29,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-18 16:25:29,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2020-08-18 16:25:29,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-08-18 16:25:29,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2020-08-18 16:25:29,730 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 126 [2020-08-18 16:25:29,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:29,730 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2020-08-18 16:25:29,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 16:25:29,731 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2020-08-18 16:25:29,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-18 16:25:29,731 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:29,732 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:29,732 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 16:25:29,732 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:29,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:29,732 INFO L82 PathProgramCache]: Analyzing trace with hash 1493345097, now seen corresponding path program 39 times [2020-08-18 16:25:29,733 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:29,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250370542] [2020-08-18 16:25:29,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:29,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:31,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:31,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:31,049 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 16:25:31,049 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250370542] [2020-08-18 16:25:31,049 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:31,049 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 16:25:31,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967119426] [2020-08-18 16:25:31,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 16:25:31,050 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:31,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 16:25:31,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 16:25:31,051 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand 44 states. [2020-08-18 16:25:33,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:33,361 INFO L93 Difference]: Finished difference Result 138 states and 179 transitions. [2020-08-18 16:25:33,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 16:25:33,362 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 129 [2020-08-18 16:25:33,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:33,365 INFO L225 Difference]: With dead ends: 138 [2020-08-18 16:25:33,365 INFO L226 Difference]: Without dead ends: 133 [2020-08-18 16:25:33,366 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 16:25:33,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-18 16:25:33,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2020-08-18 16:25:33,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-18 16:25:33,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 174 transitions. [2020-08-18 16:25:33,380 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 174 transitions. Word has length 129 [2020-08-18 16:25:33,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:33,381 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 174 transitions. [2020-08-18 16:25:33,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 16:25:33,381 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 174 transitions. [2020-08-18 16:25:33,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-18 16:25:33,382 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:33,382 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:33,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 16:25:33,383 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:33,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:33,383 INFO L82 PathProgramCache]: Analyzing trace with hash 500148978, now seen corresponding path program 40 times [2020-08-18 16:25:33,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:33,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597132385] [2020-08-18 16:25:33,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:33,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:34,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:34,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:34,883 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 16:25:34,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597132385] [2020-08-18 16:25:34,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:34,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 16:25:34,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61153121] [2020-08-18 16:25:34,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 16:25:34,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:34,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 16:25:34,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 16:25:34,885 INFO L87 Difference]: Start difference. First operand 133 states and 174 transitions. Second operand 45 states. [2020-08-18 16:25:37,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:37,313 INFO L93 Difference]: Finished difference Result 141 states and 183 transitions. [2020-08-18 16:25:37,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 16:25:37,313 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 132 [2020-08-18 16:25:37,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:37,315 INFO L225 Difference]: With dead ends: 141 [2020-08-18 16:25:37,315 INFO L226 Difference]: Without dead ends: 136 [2020-08-18 16:25:37,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=91, Invalid=1979, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 16:25:37,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-08-18 16:25:37,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2020-08-18 16:25:37,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-08-18 16:25:37,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 178 transitions. [2020-08-18 16:25:37,328 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 178 transitions. Word has length 132 [2020-08-18 16:25:37,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:37,328 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 178 transitions. [2020-08-18 16:25:37,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 16:25:37,328 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 178 transitions. [2020-08-18 16:25:37,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-08-18 16:25:37,329 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:37,329 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:37,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 16:25:37,330 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:37,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:37,330 INFO L82 PathProgramCache]: Analyzing trace with hash 224269993, now seen corresponding path program 41 times [2020-08-18 16:25:37,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:37,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1378572487] [2020-08-18 16:25:37,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:37,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat