/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-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 16:24:16,369 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 16:24:16,372 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 16:24:16,413 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 16:24:16,413 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 16:24:16,424 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 16:24:16,426 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 16:24:16,430 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 16:24:16,433 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 16:24:16,437 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 16:24:16,438 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 16:24:16,439 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 16:24:16,439 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 16:24:16,442 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 16:24:16,445 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 16:24:16,446 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 16:24:16,448 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 16:24:16,449 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 16:24:16,452 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 16:24:16,459 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 16:24:16,460 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 16:24:16,462 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 16:24:16,463 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 16:24:16,464 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 16:24:16,468 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 16:24:16,479 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 16:24:16,480 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 16:24:16,481 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 16:24:16,482 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 16:24:16,511 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 16:24:16,511 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 16:24:16,513 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 16:24:16,514 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 16:24:16,514 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 16:24:16,514 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 16:24:16,515 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 16:24:16,515 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 16:24:16,515 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 16:24:16,515 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 16:24:16,516 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 16:24:16,517 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 16:24:16,517 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 16:24:16,517 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 16:24:16,517 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 16:24:16,518 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 16:24:16,518 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 16:24:16,518 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 16:24:16,518 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 16:24:16,518 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 16:24:16,518 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 16:24:16,519 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 16:24:16,519 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 16:24:16,519 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 16:24:16,520 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 16:24:16,520 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 16:24:16,520 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 16:24:16,520 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 16:24:16,520 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 16:24:16,520 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 16:24:16,797 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 16:24:16,811 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 16:24:16,815 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 16:24:16,816 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 16:24:16,817 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 16:24:16,818 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-18 16:24:16,879 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e01d9c46a/ff7ae35b131f44e98ebbca8cdb3fb86b/FLAG4faa7cd17 [2020-08-18 16:24:17,318 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 16:24:17,318 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-18 16:24:17,327 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e01d9c46a/ff7ae35b131f44e98ebbca8cdb3fb86b/FLAG4faa7cd17 [2020-08-18 16:24:17,750 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e01d9c46a/ff7ae35b131f44e98ebbca8cdb3fb86b [2020-08-18 16:24:17,760 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 16:24:17,762 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 16:24:17,763 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 16:24:17,763 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 16:24:17,767 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 16:24:17,768 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:24:17" (1/1) ... [2020-08-18 16:24:17,771 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@92e95d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:17, skipping insertion in model container [2020-08-18 16:24:17,771 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:24:17" (1/1) ... [2020-08-18 16:24:17,779 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 16:24:17,795 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 16:24:17,967 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:24:17,973 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 16:24:17,988 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:24:18,003 INFO L208 MainTranslator]: Completed translation [2020-08-18 16:24:18,004 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:18 WrapperNode [2020-08-18 16:24:18,004 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 16:24:18,005 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 16:24:18,005 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 16:24:18,005 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 16:24:18,018 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:18" (1/1) ... [2020-08-18 16:24:18,019 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:18" (1/1) ... [2020-08-18 16:24:18,023 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:18" (1/1) ... [2020-08-18 16:24:18,024 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:18" (1/1) ... [2020-08-18 16:24:18,106 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:18" (1/1) ... [2020-08-18 16:24:18,112 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:18" (1/1) ... [2020-08-18 16:24:18,113 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:18" (1/1) ... [2020-08-18 16:24:18,114 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 16:24:18,115 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 16:24:18,115 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 16:24:18,115 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 16:24:18,116 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:18" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 16:24:18,183 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 16:24:18,183 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 16:24:18,183 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 16:24:18,183 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 16:24:18,183 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 16:24:18,184 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 16:24:18,184 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 16:24:18,184 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 16:24:18,184 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 16:24:18,350 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 16:24:18,351 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 16:24:18,357 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:24:18 BoogieIcfgContainer [2020-08-18 16:24:18,357 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 16:24:18,359 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 16:24:18,359 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 16:24:18,364 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 16:24:18,364 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 04:24:17" (1/3) ... [2020-08-18 16:24:18,366 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48b8aa03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:24:18, skipping insertion in model container [2020-08-18 16:24:18,366 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:18" (2/3) ... [2020-08-18 16:24:18,366 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48b8aa03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:24:18, skipping insertion in model container [2020-08-18 16:24:18,367 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:24:18" (3/3) ... [2020-08-18 16:24:18,369 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-18 16:24:18,378 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 16:24:18,385 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 16:24:18,399 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 16:24:18,423 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 16:24:18,423 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 16:24:18,423 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 16:24:18,423 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 16:24:18,424 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 16:24:18,424 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 16:24:18,424 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 16:24:18,424 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 16:24:18,440 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 16:24:18,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 16:24:18,445 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:18,446 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:18,447 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:18,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:18,452 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 16:24:18,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:18,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1106364715] [2020-08-18 16:24:18,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:18,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:18,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:18,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:18,666 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 16:24:18,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1106364715] [2020-08-18 16:24:18,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:24:18,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 16:24:18,671 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928094706] [2020-08-18 16:24:18,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 16:24:18,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:18,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 16:24:18,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 16:24:18,708 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 16:24:18,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:18,860 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 16:24:18,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 16:24:18,863 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 16:24:18,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:18,872 INFO L225 Difference]: With dead ends: 29 [2020-08-18 16:24:18,872 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 16:24:18,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 16:24:18,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 16:24:18,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 16:24:18,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 16:24:18,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 16:24:18,920 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 16:24:18,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:18,920 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 16:24:18,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 16:24:18,921 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 16:24:18,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 16:24:18,923 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:18,923 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:18,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 16:24:18,924 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:18,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:18,925 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 16:24:18,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:18,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [821742254] [2020-08-18 16:24:18,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:18,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:19,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,031 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:19,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [821742254] [2020-08-18 16:24:19,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:19,033 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 16:24:19,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542522793] [2020-08-18 16:24:19,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 16:24:19,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:19,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 16:24:19,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 16:24:19,036 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 16:24:19,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:19,055 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 16:24:19,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 16:24:19,055 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 16:24:19,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:19,056 INFO L225 Difference]: With dead ends: 18 [2020-08-18 16:24:19,057 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 16:24:19,058 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 16:24:19,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 16:24:19,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 16:24:19,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 16:24:19,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 16:24:19,063 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 16:24:19,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:19,063 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 16:24:19,063 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 16:24:19,063 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 16:24:19,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 16:24:19,064 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:19,064 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:19,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 16:24:19,065 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:19,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:19,065 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 16:24:19,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:19,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [138827021] [2020-08-18 16:24:19,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:19,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:19,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,187 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 16:24:19,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [138827021] [2020-08-18 16:24:19,190 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:19,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 16:24:19,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109331426] [2020-08-18 16:24:19,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 16:24:19,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:19,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 16:24:19,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:24:19,193 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 16:24:19,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:19,232 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 16:24:19,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 16:24:19,233 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 16:24:19,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:19,233 INFO L225 Difference]: With dead ends: 19 [2020-08-18 16:24:19,234 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 16:24:19,234 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:24:19,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 16:24:19,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 16:24:19,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 16:24:19,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 16:24:19,240 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 16:24:19,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:19,240 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 16:24:19,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 16:24:19,241 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 16:24:19,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 16:24:19,241 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:19,242 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:19,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 16:24:19,242 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:19,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:19,243 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 16:24:19,243 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:19,243 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [445725476] [2020-08-18 16:24:19,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:19,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:19,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,341 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:19,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [445725476] [2020-08-18 16:24:19,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:19,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 16:24:19,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671647949] [2020-08-18 16:24:19,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 16:24:19,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:19,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 16:24:19,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 16:24:19,344 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 16:24:19,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:19,370 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 16:24:19,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 16:24:19,370 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 16:24:19,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:19,371 INFO L225 Difference]: With dead ends: 20 [2020-08-18 16:24:19,371 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 16:24:19,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 16:24:19,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 16:24:19,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 16:24:19,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 16:24:19,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 16:24:19,378 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 16:24:19,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:19,378 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 16:24:19,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 16:24:19,378 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 16:24:19,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 16:24:19,379 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:19,379 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:19,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 16:24:19,380 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:19,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:19,380 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 16:24:19,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:19,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1695773487] [2020-08-18 16:24:19,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:19,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:19,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,487 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:19,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1695773487] [2020-08-18 16:24:19,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:19,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 16:24:19,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400669503] [2020-08-18 16:24:19,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 16:24:19,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:19,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 16:24:19,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 16:24:19,490 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 16:24:19,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:19,529 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 16:24:19,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 16:24:19,530 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 16:24:19,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:19,531 INFO L225 Difference]: With dead ends: 21 [2020-08-18 16:24:19,531 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 16:24:19,532 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 16:24:19,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 16:24:19,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 16:24:19,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 16:24:19,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 16:24:19,538 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 16:24:19,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:19,539 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 16:24:19,539 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 16:24:19,539 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 16:24:19,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 16:24:19,540 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:19,540 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:19,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 16:24:19,541 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:19,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:19,541 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 16:24:19,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:19,542 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1358749162] [2020-08-18 16:24:19,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:19,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:19,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,682 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:19,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1358749162] [2020-08-18 16:24:19,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:19,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 16:24:19,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517734037] [2020-08-18 16:24:19,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 16:24:19,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:19,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 16:24:19,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 16:24:19,685 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-18 16:24:19,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:19,730 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 16:24:19,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 16:24:19,731 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-18 16:24:19,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:19,732 INFO L225 Difference]: With dead ends: 22 [2020-08-18 16:24:19,732 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 16:24:19,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 16:24:19,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 16:24:19,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 16:24:19,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 16:24:19,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 16:24:19,738 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 16:24:19,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:19,738 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 16:24:19,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 16:24:19,739 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 16:24:19,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 16:24:19,740 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:19,740 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:19,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 16:24:19,740 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:19,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:19,741 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 16:24:19,741 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:19,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805041316] [2020-08-18 16:24:19,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:19,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:19,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,877 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:19,878 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805041316] [2020-08-18 16:24:19,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:19,878 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 16:24:19,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046826292] [2020-08-18 16:24:19,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 16:24:19,879 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:19,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 16:24:19,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 16:24:19,880 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-18 16:24:19,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:19,936 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-18 16:24:19,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 16:24:19,937 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-18 16:24:19,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:19,937 INFO L225 Difference]: With dead ends: 23 [2020-08-18 16:24:19,938 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 16:24:19,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 16:24:19,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 16:24:19,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 16:24:19,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 16:24:19,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-18 16:24:19,944 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-18 16:24:19,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:19,944 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-18 16:24:19,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 16:24:19,945 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-18 16:24:19,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 16:24:19,945 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:19,945 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:19,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 16:24:19,946 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:19,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:19,946 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-18 16:24:19,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:19,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1398070981] [2020-08-18 16:24:19,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:19,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:20,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,092 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:20,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1398070981] [2020-08-18 16:24:20,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:20,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 16:24:20,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537179001] [2020-08-18 16:24:20,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 16:24:20,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:20,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 16:24:20,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 16:24:20,095 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-18 16:24:20,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:20,152 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 16:24:20,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 16:24:20,153 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-18 16:24:20,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:20,154 INFO L225 Difference]: With dead ends: 24 [2020-08-18 16:24:20,154 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 16:24:20,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 16:24:20,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 16:24:20,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 16:24:20,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 16:24:20,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 16:24:20,161 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-18 16:24:20,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:20,161 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 16:24:20,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 16:24:20,161 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 16:24:20,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 16:24:20,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:20,162 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:20,162 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 16:24:20,163 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:20,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:20,163 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-18 16:24:20,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:20,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [398458705] [2020-08-18 16:24:20,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:20,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:20,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,364 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:20,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [398458705] [2020-08-18 16:24:20,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:20,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 16:24:20,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493135543] [2020-08-18 16:24:20,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 16:24:20,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:20,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 16:24:20,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 16:24:20,368 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-18 16:24:20,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:20,456 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-18 16:24:20,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 16:24:20,458 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-18 16:24:20,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:20,459 INFO L225 Difference]: With dead ends: 25 [2020-08-18 16:24:20,459 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 16:24:20,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 16:24:20,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 16:24:20,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 16:24:20,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 16:24:20,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 16:24:20,469 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-18 16:24:20,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:20,469 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 16:24:20,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 16:24:20,474 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 16:24:20,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 16:24:20,475 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:20,475 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:20,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 16:24:20,475 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:20,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:20,476 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-18 16:24:20,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:20,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [870525218] [2020-08-18 16:24:20,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:20,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:20,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,667 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 16:24:20,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [870525218] [2020-08-18 16:24:20,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:20,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 16:24:20,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174854102] [2020-08-18 16:24:20,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 16:24:20,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:20,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 16:24:20,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 16:24:20,670 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-18 16:24:20,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:20,755 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 16:24:20,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 16:24:20,756 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-18 16:24:20,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:20,756 INFO L225 Difference]: With dead ends: 26 [2020-08-18 16:24:20,756 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 16:24:20,757 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 16:24:20,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 16:24:20,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 16:24:20,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 16:24:20,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 16:24:20,762 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-18 16:24:20,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:20,762 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 16:24:20,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 16:24:20,763 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 16:24:20,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 16:24:20,763 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:20,763 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:20,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 16:24:20,764 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:20,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:20,764 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-18 16:24:20,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:20,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1474341510] [2020-08-18 16:24:20,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:20,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:20,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,976 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:20,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1474341510] [2020-08-18 16:24:20,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:20,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 16:24:20,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122361604] [2020-08-18 16:24:20,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 16:24:20,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:20,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 16:24:20,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 16:24:20,980 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-18 16:24:21,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:21,089 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-18 16:24:21,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 16:24:21,091 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-18 16:24:21,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:21,092 INFO L225 Difference]: With dead ends: 27 [2020-08-18 16:24:21,092 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 16:24:21,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 16:24:21,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 16:24:21,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 16:24:21,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 16:24:21,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-18 16:24:21,102 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-18 16:24:21,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:21,102 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-18 16:24:21,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 16:24:21,103 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-18 16:24:21,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 16:24:21,104 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:21,104 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:21,104 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 16:24:21,105 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:21,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:21,106 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-18 16:24:21,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:21,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [438422697] [2020-08-18 16:24:21,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:21,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:21,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:21,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:21,343 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:21,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [438422697] [2020-08-18 16:24:21,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:21,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 16:24:21,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054175907] [2020-08-18 16:24:21,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 16:24:21,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:21,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 16:24:21,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 16:24:21,349 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-18 16:24:21,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:21,459 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 16:24:21,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 16:24:21,461 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-18 16:24:21,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:21,462 INFO L225 Difference]: With dead ends: 28 [2020-08-18 16:24:21,462 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 16:24:21,463 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 16:24:21,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 16:24:21,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 16:24:21,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 16:24:21,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 16:24:21,472 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-18 16:24:21,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:21,472 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 16:24:21,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 16:24:21,472 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 16:24:21,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 16:24:21,474 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:21,475 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:21,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 16:24:21,475 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:21,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:21,477 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-18 16:24:21,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:21,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [211368558] [2020-08-18 16:24:21,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:21,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:21,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:21,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:21,732 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:21,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [211368558] [2020-08-18 16:24:21,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:21,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 16:24:21,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685418348] [2020-08-18 16:24:21,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 16:24:21,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:21,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 16:24:21,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 16:24:21,738 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-18 16:24:21,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:21,855 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 16:24:21,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 16:24:21,858 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-18 16:24:21,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:21,859 INFO L225 Difference]: With dead ends: 29 [2020-08-18 16:24:21,859 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 16:24:21,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 16:24:21,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 16:24:21,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 16:24:21,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 16:24:21,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-18 16:24:21,866 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-18 16:24:21,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:21,867 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-18 16:24:21,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 16:24:21,867 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-18 16:24:21,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 16:24:21,868 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:21,868 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:21,868 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 16:24:21,868 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:21,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:21,869 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-18 16:24:21,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:21,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2035007350] [2020-08-18 16:24:21,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:21,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:22,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:22,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:22,124 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:22,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2035007350] [2020-08-18 16:24:22,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:22,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 16:24:22,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753957876] [2020-08-18 16:24:22,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 16:24:22,127 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:22,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 16:24:22,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 16:24:22,128 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-18 16:24:22,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:22,277 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 16:24:22,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 16:24:22,278 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-18 16:24:22,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:22,279 INFO L225 Difference]: With dead ends: 30 [2020-08-18 16:24:22,279 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 16:24:22,280 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 16:24:22,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 16:24:22,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 16:24:22,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 16:24:22,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 16:24:22,284 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-18 16:24:22,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:22,285 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 16:24:22,285 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 16:24:22,285 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 16:24:22,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 16:24:22,286 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:22,286 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:22,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 16:24:22,286 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:22,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:22,286 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-18 16:24:22,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:22,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1192919181] [2020-08-18 16:24:22,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:22,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:22,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:22,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:22,541 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:22,541 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1192919181] [2020-08-18 16:24:22,541 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:22,542 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 16:24:22,542 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813191222] [2020-08-18 16:24:22,542 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 16:24:22,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:22,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 16:24:22,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 16:24:22,543 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-18 16:24:22,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:22,693 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-18 16:24:22,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 16:24:22,694 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-18 16:24:22,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:22,695 INFO L225 Difference]: With dead ends: 31 [2020-08-18 16:24:22,695 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 16:24:22,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 16:24:22,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 16:24:22,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 16:24:22,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 16:24:22,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 16:24:22,700 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-18 16:24:22,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:22,701 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 16:24:22,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 16:24:22,701 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 16:24:22,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 16:24:22,701 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:22,702 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:22,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 16:24:22,702 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:22,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:22,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-18 16:24:22,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:22,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [986582379] [2020-08-18 16:24:22,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:22,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:22,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:22,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:22,969 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:22,970 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [986582379] [2020-08-18 16:24:22,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:22,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 16:24:22,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632565893] [2020-08-18 16:24:22,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 16:24:22,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:22,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 16:24:22,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 16:24:22,973 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-18 16:24:23,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:23,154 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 16:24:23,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 16:24:23,155 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-18 16:24:23,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:23,156 INFO L225 Difference]: With dead ends: 32 [2020-08-18 16:24:23,156 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 16:24:23,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 16:24:23,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 16:24:23,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 16:24:23,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 16:24:23,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 16:24:23,161 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-18 16:24:23,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:23,162 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 16:24:23,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 16:24:23,162 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 16:24:23,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 16:24:23,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:23,163 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:23,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 16:24:23,163 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:23,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:23,163 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-18 16:24:23,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:23,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563926438] [2020-08-18 16:24:23,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:23,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:23,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:23,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:23,483 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:23,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563926438] [2020-08-18 16:24:23,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:23,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 16:24:23,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897074852] [2020-08-18 16:24:23,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 16:24:23,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:23,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 16:24:23,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 16:24:23,486 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-18 16:24:23,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:23,705 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-18 16:24:23,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 16:24:23,706 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-18 16:24:23,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:23,707 INFO L225 Difference]: With dead ends: 33 [2020-08-18 16:24:23,707 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 16:24:23,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 16:24:23,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 16:24:23,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 16:24:23,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 16:24:23,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-18 16:24:23,714 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-18 16:24:23,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:23,714 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-18 16:24:23,714 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 16:24:23,715 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-18 16:24:23,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 16:24:23,716 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:23,716 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:23,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 16:24:23,716 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:23,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:23,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-18 16:24:23,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:23,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1526256172] [2020-08-18 16:24:23,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:23,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:24,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:24,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:24,050 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:24,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1526256172] [2020-08-18 16:24:24,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:24,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 16:24:24,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391088824] [2020-08-18 16:24:24,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 16:24:24,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:24,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 16:24:24,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 16:24:24,055 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-18 16:24:24,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:24,299 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 16:24:24,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 16:24:24,300 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-18 16:24:24,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:24,301 INFO L225 Difference]: With dead ends: 34 [2020-08-18 16:24:24,301 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 16:24:24,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 16:24:24,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 16:24:24,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 16:24:24,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 16:24:24,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 16:24:24,307 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-18 16:24:24,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:24,308 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 16:24:24,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 16:24:24,308 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 16:24:24,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 16:24:24,309 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:24,309 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:24,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 16:24:24,309 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:24,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:24,310 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-18 16:24:24,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:24,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1964671945] [2020-08-18 16:24:24,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:24,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:24,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:24,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:24,660 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:24,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1964671945] [2020-08-18 16:24:24,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:24,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 16:24:24,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733404211] [2020-08-18 16:24:24,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 16:24:24,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:24,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 16:24:24,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 16:24:24,663 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-18 16:24:24,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:24,894 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 16:24:24,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 16:24:24,896 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-18 16:24:24,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:24,897 INFO L225 Difference]: With dead ends: 35 [2020-08-18 16:24:24,897 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 16:24:24,897 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 16:24:24,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 16:24:24,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 16:24:24,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 16:24:24,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-18 16:24:24,903 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-18 16:24:24,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:24,903 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-18 16:24:24,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 16:24:24,903 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-18 16:24:24,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 16:24:24,904 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:24,904 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:24,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 16:24:24,904 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:24,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:24,905 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-18 16:24:24,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:24,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [654606151] [2020-08-18 16:24:24,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:24,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:25,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:25,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:25,268 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:25,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [654606151] [2020-08-18 16:24:25,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:25,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 16:24:25,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180982027] [2020-08-18 16:24:25,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 16:24:25,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:25,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 16:24:25,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 16:24:25,270 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-18 16:24:25,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:25,556 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 16:24:25,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 16:24:25,556 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-18 16:24:25,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:25,557 INFO L225 Difference]: With dead ends: 36 [2020-08-18 16:24:25,558 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 16:24:25,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 16:24:25,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 16:24:25,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 16:24:25,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 16:24:25,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 16:24:25,565 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-18 16:24:25,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:25,566 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 16:24:25,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 16:24:25,566 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 16:24:25,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 16:24:25,568 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:25,568 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:25,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 16:24:25,569 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:25,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:25,569 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-18 16:24:25,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:25,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1301191046] [2020-08-18 16:24:25,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:25,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:26,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:26,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:26,006 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:26,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1301191046] [2020-08-18 16:24:26,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:26,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 16:24:26,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625327097] [2020-08-18 16:24:26,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 16:24:26,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:26,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 16:24:26,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 16:24:26,008 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-18 16:24:26,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:26,295 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-18 16:24:26,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 16:24:26,296 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-18 16:24:26,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:26,296 INFO L225 Difference]: With dead ends: 37 [2020-08-18 16:24:26,296 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 16:24:26,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 16:24:26,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 16:24:26,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 16:24:26,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 16:24:26,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 16:24:26,303 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-18 16:24:26,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:26,304 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 16:24:26,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 16:24:26,304 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 16:24:26,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 16:24:26,305 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:26,305 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:26,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 16:24:26,305 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:26,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:26,305 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-18 16:24:26,306 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:26,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [965754560] [2020-08-18 16:24:26,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:26,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:26,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:26,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:26,750 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:26,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [965754560] [2020-08-18 16:24:26,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:26,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 16:24:26,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409493112] [2020-08-18 16:24:26,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 16:24:26,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:26,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 16:24:26,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 16:24:26,753 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-18 16:24:27,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:27,082 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 16:24:27,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 16:24:27,084 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-18 16:24:27,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:27,084 INFO L225 Difference]: With dead ends: 38 [2020-08-18 16:24:27,085 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 16:24:27,085 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 16:24:27,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 16:24:27,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 16:24:27,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 16:24:27,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 16:24:27,095 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-18 16:24:27,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:27,095 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 16:24:27,095 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 16:24:27,095 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 16:24:27,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 16:24:27,097 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:27,098 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:27,098 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 16:24:27,098 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:27,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:27,098 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-18 16:24:27,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:27,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1758601803] [2020-08-18 16:24:27,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:27,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:27,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:27,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:27,593 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:27,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1758601803] [2020-08-18 16:24:27,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:27,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 16:24:27,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421615293] [2020-08-18 16:24:27,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 16:24:27,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:27,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 16:24:27,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 16:24:27,604 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-18 16:24:27,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:27,933 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-18 16:24:27,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 16:24:27,933 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-18 16:24:27,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:27,942 INFO L225 Difference]: With dead ends: 39 [2020-08-18 16:24:27,942 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 16:24:27,943 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 16:24:27,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 16:24:27,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 16:24:27,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 16:24:27,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-18 16:24:27,948 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-18 16:24:27,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:27,948 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-18 16:24:27,948 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 16:24:27,948 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-18 16:24:27,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 16:24:27,949 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:27,949 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:27,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 16:24:27,950 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:27,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:27,950 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-18 16:24:27,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:27,950 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1819917942] [2020-08-18 16:24:27,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:27,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:28,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:28,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:28,483 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:28,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1819917942] [2020-08-18 16:24:28,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:28,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 16:24:28,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842129241] [2020-08-18 16:24:28,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 16:24:28,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:28,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 16:24:28,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 16:24:28,485 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-18 16:24:28,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:28,875 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 16:24:28,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 16:24:28,876 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-18 16:24:28,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:28,877 INFO L225 Difference]: With dead ends: 40 [2020-08-18 16:24:28,877 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 16:24:28,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 16:24:28,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 16:24:28,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 16:24:28,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 16:24:28,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 16:24:28,882 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-18 16:24:28,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:28,883 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 16:24:28,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 16:24:28,883 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 16:24:28,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 16:24:28,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:28,883 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:28,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 16:24:28,884 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:28,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:28,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-18 16:24:28,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:28,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [457760641] [2020-08-18 16:24:28,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:28,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:29,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:29,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:29,427 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:29,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [457760641] [2020-08-18 16:24:29,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:29,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 16:24:29,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265512622] [2020-08-18 16:24:29,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 16:24:29,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:29,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 16:24:29,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 16:24:29,428 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-18 16:24:29,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:29,817 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 16:24:29,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 16:24:29,818 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-18 16:24:29,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:29,819 INFO L225 Difference]: With dead ends: 41 [2020-08-18 16:24:29,819 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 16:24:29,820 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 16:24:29,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 16:24:29,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 16:24:29,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 16:24:29,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-18 16:24:29,825 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-18 16:24:29,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:29,825 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-18 16:24:29,825 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 16:24:29,825 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-18 16:24:29,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 16:24:29,826 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:29,826 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:29,826 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 16:24:29,826 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:29,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:29,827 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-18 16:24:29,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:29,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [94829662] [2020-08-18 16:24:29,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:29,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:30,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:30,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:30,364 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:30,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [94829662] [2020-08-18 16:24:30,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:30,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 16:24:30,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3848599] [2020-08-18 16:24:30,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 16:24:30,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:30,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 16:24:30,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 16:24:30,367 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-18 16:24:30,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:30,800 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 16:24:30,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 16:24:30,800 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-18 16:24:30,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:30,801 INFO L225 Difference]: With dead ends: 42 [2020-08-18 16:24:30,801 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 16:24:30,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 16:24:30,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 16:24:30,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 16:24:30,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 16:24:30,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 16:24:30,815 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-18 16:24:30,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:30,816 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 16:24:30,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 16:24:30,816 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 16:24:30,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 16:24:30,816 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:30,816 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:30,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 16:24:30,819 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:30,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:30,820 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-18 16:24:30,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:30,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323692001] [2020-08-18 16:24:30,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:30,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:31,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:31,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:31,459 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:31,459 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323692001] [2020-08-18 16:24:31,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:31,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 16:24:31,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207940505] [2020-08-18 16:24:31,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 16:24:31,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:31,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 16:24:31,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 16:24:31,461 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-18 16:24:31,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:31,924 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-18 16:24:31,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 16:24:31,925 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-18 16:24:31,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:31,926 INFO L225 Difference]: With dead ends: 43 [2020-08-18 16:24:31,926 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 16:24:31,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 16:24:31,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 16:24:31,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 16:24:31,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 16:24:31,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 16:24:31,936 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-18 16:24:31,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:31,936 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 16:24:31,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 16:24:31,936 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 16:24:31,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 16:24:31,937 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:31,942 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:31,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 16:24:31,942 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:31,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:31,943 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-18 16:24:31,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:31,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1892684702] [2020-08-18 16:24:31,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:31,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:32,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:32,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:32,781 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:32,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1892684702] [2020-08-18 16:24:32,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:32,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 16:24:32,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701304945] [2020-08-18 16:24:32,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 16:24:32,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:32,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 16:24:32,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 16:24:32,785 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-18 16:24:33,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:33,356 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 16:24:33,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 16:24:33,356 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-18 16:24:33,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:33,357 INFO L225 Difference]: With dead ends: 44 [2020-08-18 16:24:33,357 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 16:24:33,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 16:24:33,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 16:24:33,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 16:24:33,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 16:24:33,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 16:24:33,363 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-18 16:24:33,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:33,363 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 16:24:33,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 16:24:33,363 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 16:24:33,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 16:24:33,364 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:33,364 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:33,364 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 16:24:33,365 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:33,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:33,365 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-18 16:24:33,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:33,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1999658434] [2020-08-18 16:24:33,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:33,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:34,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:34,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:34,122 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:34,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1999658434] [2020-08-18 16:24:34,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:34,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 16:24:34,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445268139] [2020-08-18 16:24:34,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 16:24:34,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:34,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 16:24:34,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 16:24:34,125 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-18 16:24:34,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:34,807 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-18 16:24:34,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 16:24:34,808 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-18 16:24:34,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:34,808 INFO L225 Difference]: With dead ends: 45 [2020-08-18 16:24:34,809 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 16:24:34,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 16:24:34,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 16:24:34,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 16:24:34,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 16:24:34,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-18 16:24:34,818 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-18 16:24:34,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:34,819 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-18 16:24:34,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 16:24:34,819 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-18 16:24:34,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 16:24:34,820 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:34,820 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:34,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 16:24:34,820 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:34,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:34,821 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-18 16:24:34,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:34,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [988787361] [2020-08-18 16:24:34,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:34,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:35,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:35,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:35,843 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:35,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [988787361] [2020-08-18 16:24:35,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:35,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 16:24:35,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132916288] [2020-08-18 16:24:35,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 16:24:35,846 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:35,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 16:24:35,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 16:24:35,848 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-18 16:24:36,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:36,413 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 16:24:36,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 16:24:36,414 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-18 16:24:36,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:36,415 INFO L225 Difference]: With dead ends: 46 [2020-08-18 16:24:36,415 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 16:24:36,416 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 16:24:36,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 16:24:36,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 16:24:36,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 16:24:36,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 16:24:36,420 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-18 16:24:36,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:36,421 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 16:24:36,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 16:24:36,421 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 16:24:36,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 16:24:36,421 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:36,422 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:36,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 16:24:36,422 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:36,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:36,422 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-18 16:24:36,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:36,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [709170230] [2020-08-18 16:24:36,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:36,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:37,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:37,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:37,217 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:37,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [709170230] [2020-08-18 16:24:37,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:37,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 16:24:37,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182163962] [2020-08-18 16:24:37,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 16:24:37,218 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:37,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 16:24:37,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 16:24:37,219 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-18 16:24:37,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:37,861 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 16:24:37,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 16:24:37,865 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-18 16:24:37,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:37,866 INFO L225 Difference]: With dead ends: 47 [2020-08-18 16:24:37,866 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 16:24:37,866 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 16:24:37,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 16:24:37,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 16:24:37,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 16:24:37,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-18 16:24:37,871 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-18 16:24:37,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:37,871 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-18 16:24:37,871 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 16:24:37,871 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-18 16:24:37,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 16:24:37,872 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:37,872 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:37,872 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 16:24:37,872 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:37,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:37,873 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-18 16:24:37,873 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:37,873 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1394596915] [2020-08-18 16:24:37,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:37,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:38,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:38,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:38,708 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:38,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1394596915] [2020-08-18 16:24:38,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:38,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 16:24:38,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44083909] [2020-08-18 16:24:38,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 16:24:38,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:38,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 16:24:38,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 16:24:38,710 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-18 16:24:39,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:39,369 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 16:24:39,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 16:24:39,370 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-18 16:24:39,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:39,370 INFO L225 Difference]: With dead ends: 48 [2020-08-18 16:24:39,370 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 16:24:39,371 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 16:24:39,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 16:24:39,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 16:24:39,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 16:24:39,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 16:24:39,375 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-18 16:24:39,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:39,375 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 16:24:39,376 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 16:24:39,376 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 16:24:39,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 16:24:39,376 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:39,376 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:39,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 16:24:39,377 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:39,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:39,377 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-18 16:24:39,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:39,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1204239758] [2020-08-18 16:24:39,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:39,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:40,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:40,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:40,286 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:40,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1204239758] [2020-08-18 16:24:40,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:40,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 16:24:40,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334312650] [2020-08-18 16:24:40,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 16:24:40,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:40,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 16:24:40,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 16:24:40,288 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-18 16:24:41,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:41,022 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-18 16:24:41,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 16:24:41,022 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-18 16:24:41,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:41,023 INFO L225 Difference]: With dead ends: 49 [2020-08-18 16:24:41,023 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 16:24:41,025 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 16:24:41,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 16:24:41,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 16:24:41,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 16:24:41,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 16:24:41,029 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-18 16:24:41,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:41,029 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 16:24:41,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 16:24:41,029 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 16:24:41,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 16:24:41,030 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:41,030 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:41,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 16:24:41,030 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:41,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:41,031 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-18 16:24:41,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:41,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944109514] [2020-08-18 16:24:41,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:41,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:41,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:41,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:41,961 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:41,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944109514] [2020-08-18 16:24:41,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:41,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 16:24:41,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112818732] [2020-08-18 16:24:41,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 16:24:41,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:41,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 16:24:41,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 16:24:41,963 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-18 16:24:42,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:42,717 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 16:24:42,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 16:24:42,717 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-18 16:24:42,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:42,718 INFO L225 Difference]: With dead ends: 50 [2020-08-18 16:24:42,718 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 16:24:42,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 16:24:42,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 16:24:42,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 16:24:42,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 16:24:42,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 16:24:42,724 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-18 16:24:42,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:42,724 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 16:24:42,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 16:24:42,724 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 16:24:42,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 16:24:42,725 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:42,725 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:42,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 16:24:42,726 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:42,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:42,726 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-18 16:24:42,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:42,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [3153112] [2020-08-18 16:24:42,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:42,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:43,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:43,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:43,705 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:43,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [3153112] [2020-08-18 16:24:43,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:43,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 16:24:43,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726921876] [2020-08-18 16:24:43,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 16:24:43,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:43,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 16:24:43,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 16:24:43,707 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-18 16:24:44,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:44,519 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-18 16:24:44,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 16:24:44,520 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-18 16:24:44,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:44,521 INFO L225 Difference]: With dead ends: 51 [2020-08-18 16:24:44,521 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 16:24:44,523 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 16:24:44,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 16:24:44,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 16:24:44,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 16:24:44,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-18 16:24:44,527 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-18 16:24:44,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:44,530 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-18 16:24:44,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 16:24:44,530 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-18 16:24:44,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 16:24:44,530 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:44,531 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:44,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 16:24:44,531 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:44,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:44,531 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-18 16:24:44,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:44,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1499223124] [2020-08-18 16:24:44,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:44,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:45,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:45,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:45,569 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 16:24:45,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1499223124] [2020-08-18 16:24:45,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:45,570 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 16:24:45,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906825464] [2020-08-18 16:24:45,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 16:24:45,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:45,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 16:24:45,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 16:24:45,571 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-18 16:24:46,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:46,403 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 16:24:46,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 16:24:46,405 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-18 16:24:46,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:46,406 INFO L225 Difference]: With dead ends: 52 [2020-08-18 16:24:46,406 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 16:24:46,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 16:24:46,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 16:24:46,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 16:24:46,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 16:24:46,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 16:24:46,412 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-18 16:24:46,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:46,412 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 16:24:46,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 16:24:46,413 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 16:24:46,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 16:24:46,413 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:46,413 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:46,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 16:24:46,413 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:46,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:46,413 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-18 16:24:46,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:46,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1455560035] [2020-08-18 16:24:46,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:46,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:47,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:47,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:47,456 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:47,456 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1455560035] [2020-08-18 16:24:47,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:47,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 16:24:47,457 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733815615] [2020-08-18 16:24:47,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 16:24:47,457 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:47,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 16:24:47,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 16:24:47,458 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-18 16:24:48,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:48,353 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 16:24:48,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 16:24:48,354 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-18 16:24:48,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:48,355 INFO L225 Difference]: With dead ends: 53 [2020-08-18 16:24:48,355 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 16:24:48,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 16:24:48,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 16:24:48,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 16:24:48,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 16:24:48,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-18 16:24:48,359 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-18 16:24:48,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:48,359 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-18 16:24:48,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 16:24:48,359 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-18 16:24:48,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 16:24:48,360 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:48,360 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:48,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 16:24:48,360 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:48,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:48,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-18 16:24:48,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:48,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1325113422] [2020-08-18 16:24:48,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:48,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:49,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:49,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:49,456 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:49,456 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1325113422] [2020-08-18 16:24:49,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:49,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 16:24:49,457 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763681314] [2020-08-18 16:24:49,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 16:24:49,457 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:49,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 16:24:49,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 16:24:49,458 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-18 16:24:50,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:50,366 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 16:24:50,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 16:24:50,366 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-18 16:24:50,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:50,367 INFO L225 Difference]: With dead ends: 54 [2020-08-18 16:24:50,367 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 16:24:50,368 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 16:24:50,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 16:24:50,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 16:24:50,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 16:24:50,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 16:24:50,371 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-18 16:24:50,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:50,372 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 16:24:50,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 16:24:50,372 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 16:24:50,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 16:24:50,372 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:50,373 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:50,373 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 16:24:50,373 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:50,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:50,373 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-18 16:24:50,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:50,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [724842707] [2020-08-18 16:24:50,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:50,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:51,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:51,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:51,511 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:51,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [724842707] [2020-08-18 16:24:51,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:51,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 16:24:51,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100394252] [2020-08-18 16:24:51,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 16:24:51,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:51,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 16:24:51,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 16:24:51,513 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-18 16:24:52,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:52,492 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-18 16:24:52,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 16:24:52,493 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-18 16:24:52,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:52,494 INFO L225 Difference]: With dead ends: 55 [2020-08-18 16:24:52,494 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 16:24:52,495 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 16:24:52,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 16:24:52,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-18 16:24:52,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 16:24:52,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-18 16:24:52,500 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-18 16:24:52,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:52,501 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-18 16:24:52,501 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 16:24:52,501 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-18 16:24:52,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 16:24:52,501 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:52,501 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:52,502 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 16:24:52,502 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:52,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:52,502 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-18 16:24:52,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:52,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1934903765] [2020-08-18 16:24:52,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:52,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:53,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:53,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:53,690 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:53,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1934903765] [2020-08-18 16:24:53,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:53,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 16:24:53,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30870427] [2020-08-18 16:24:53,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 16:24:53,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:53,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 16:24:53,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 16:24:53,692 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-18 16:24:54,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:54,717 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 16:24:54,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 16:24:54,717 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-18 16:24:54,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:54,718 INFO L225 Difference]: With dead ends: 56 [2020-08-18 16:24:54,718 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 16:24:54,719 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 16:24:54,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 16:24:54,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-18 16:24:54,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 16:24:54,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 16:24:54,723 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-18 16:24:54,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:54,723 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 16:24:54,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 16:24:54,723 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 16:24:54,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 16:24:54,724 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:54,724 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:54,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 16:24:54,724 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:54,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:54,724 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-18 16:24:54,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:54,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1833191916] [2020-08-18 16:24:54,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:54,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:55,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:55,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:55,930 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:55,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1833191916] [2020-08-18 16:24:55,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:55,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 16:24:55,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707945845] [2020-08-18 16:24:55,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 16:24:55,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:55,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 16:24:55,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 16:24:55,932 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-18 16:24:57,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:57,033 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-18 16:24:57,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 16:24:57,033 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-18 16:24:57,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:57,034 INFO L225 Difference]: With dead ends: 57 [2020-08-18 16:24:57,034 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 16:24:57,035 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 16:24:57,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 16:24:57,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 16:24:57,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 16:24:57,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-18 16:24:57,039 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-18 16:24:57,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:57,039 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-18 16:24:57,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 16:24:57,040 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-18 16:24:57,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 16:24:57,040 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:57,040 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:57,040 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 16:24:57,040 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:57,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:57,040 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-18 16:24:57,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:57,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [919489298] [2020-08-18 16:24:57,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:57,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:58,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:58,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:58,344 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:58,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [919489298] [2020-08-18 16:24:58,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:58,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 16:24:58,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111359129] [2020-08-18 16:24:58,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 16:24:58,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:58,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 16:24:58,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 16:24:58,346 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-18 16:24:59,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:59,533 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 16:24:59,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 16:24:59,534 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-18 16:24:59,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:59,535 INFO L225 Difference]: With dead ends: 58 [2020-08-18 16:24:59,535 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 16:24:59,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 16:24:59,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 16:24:59,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-18 16:24:59,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 16:24:59,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 16:24:59,540 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-18 16:24:59,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:59,540 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 16:24:59,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 16:24:59,540 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 16:24:59,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 16:24:59,541 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:59,541 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:59,541 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 16:24:59,541 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:59,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:59,541 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-18 16:24:59,542 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:59,542 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1081489691] [2020-08-18 16:24:59,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:59,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:00,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:00,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:00,985 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:00,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1081489691] [2020-08-18 16:25:00,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:00,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 16:25:00,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930760175] [2020-08-18 16:25:00,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 16:25:00,986 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:00,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 16:25:00,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 16:25:00,987 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-18 16:25:02,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:02,205 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-18 16:25:02,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 16:25:02,207 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-18 16:25:02,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:02,208 INFO L225 Difference]: With dead ends: 59 [2020-08-18 16:25:02,208 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 16:25:02,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 16:25:02,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 16:25:02,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-18 16:25:02,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 16:25:02,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-18 16:25:02,213 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-18 16:25:02,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:02,213 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-18 16:25:02,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 16:25:02,213 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-18 16:25:02,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 16:25:02,214 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:02,214 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:02,214 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 16:25:02,214 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:02,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:02,214 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-18 16:25:02,215 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:02,215 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1083786155] [2020-08-18 16:25:02,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:02,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:03,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:03,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:03,706 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:03,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1083786155] [2020-08-18 16:25:03,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:03,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 16:25:03,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950051275] [2020-08-18 16:25:03,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 16:25:03,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:03,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 16:25:03,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 16:25:03,709 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-18 16:25:05,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:05,034 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 16:25:05,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 16:25:05,035 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-18 16:25:05,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:05,036 INFO L225 Difference]: With dead ends: 60 [2020-08-18 16:25:05,036 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 16:25:05,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 16:25:05,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 16:25:05,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 16:25:05,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 16:25:05,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 16:25:05,040 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-18 16:25:05,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:05,040 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 16:25:05,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 16:25:05,041 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 16:25:05,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 16:25:05,041 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:05,041 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:05,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 16:25:05,041 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:05,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:05,041 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-18 16:25:05,042 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:05,042 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1310022625] [2020-08-18 16:25:05,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:05,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:06,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:06,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:06,598 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:06,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1310022625] [2020-08-18 16:25:06,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:06,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 16:25:06,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553894373] [2020-08-18 16:25:06,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 16:25:06,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:06,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 16:25:06,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 16:25:06,600 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-18 16:25:07,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:07,967 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-18 16:25:07,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 16:25:07,967 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-18 16:25:07,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:07,968 INFO L225 Difference]: With dead ends: 61 [2020-08-18 16:25:07,968 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 16:25:07,969 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 16:25:07,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 16:25:07,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-18 16:25:07,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 16:25:07,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-18 16:25:07,973 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-18 16:25:07,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:07,974 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-18 16:25:07,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 16:25:07,974 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-18 16:25:07,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 16:25:07,974 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:07,974 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:07,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 16:25:07,975 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:07,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:07,975 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-18 16:25:07,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:07,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2138965823] [2020-08-18 16:25:07,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:07,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:09,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:09,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:09,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:09,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2138965823] [2020-08-18 16:25:09,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:09,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 16:25:09,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922466398] [2020-08-18 16:25:09,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 16:25:09,635 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:09,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 16:25:09,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 16:25:09,635 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-18 16:25:11,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:11,056 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 16:25:11,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 16:25:11,057 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-18 16:25:11,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:11,058 INFO L225 Difference]: With dead ends: 62 [2020-08-18 16:25:11,058 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 16:25:11,058 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 16:25:11,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 16:25:11,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 16:25:11,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 16:25:11,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 16:25:11,065 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-18 16:25:11,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:11,065 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 16:25:11,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 16:25:11,065 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 16:25:11,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 16:25:11,066 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:11,066 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:11,066 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 16:25:11,066 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:11,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:11,066 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-18 16:25:11,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:11,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [384929394] [2020-08-18 16:25:11,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:11,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:12,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:12,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:12,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:12,759 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [384929394] [2020-08-18 16:25:12,759 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:12,760 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 16:25:12,760 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105611230] [2020-08-18 16:25:12,760 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 16:25:12,760 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:12,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 16:25:12,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 16:25:12,761 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-18 16:25:14,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:14,255 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-18 16:25:14,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 16:25:14,256 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-18 16:25:14,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:14,257 INFO L225 Difference]: With dead ends: 63 [2020-08-18 16:25:14,257 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 16:25:14,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 16:25:14,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 16:25:14,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 16:25:14,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 16:25:14,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-18 16:25:14,262 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-18 16:25:14,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:14,263 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-18 16:25:14,263 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 16:25:14,263 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-18 16:25:14,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 16:25:14,263 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:14,263 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:14,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 16:25:14,264 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:14,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:14,264 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-18 16:25:14,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:14,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2042561247] [2020-08-18 16:25:14,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:14,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:16,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:16,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:16,019 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:16,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2042561247] [2020-08-18 16:25:16,019 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:16,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 16:25:16,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061659606] [2020-08-18 16:25:16,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 16:25:16,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:16,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 16:25:16,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 16:25:16,020 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states.