/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 19:37:52,631 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 19:37:52,634 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 19:37:52,658 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-18 19:37:52,667 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 19:37:52,668 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 19:37:52,669 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 19:37:52,670 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 19:37:52,671 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 19:37:52,672 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 19:37:52,674 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 19:37:52,675 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 19:37:52,677 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 19:37:52,678 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 19:37:52,679 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 19:37:52,680 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 19:37:52,682 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 19:37:52,690 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 19:37:52,691 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 19:37:52,691 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 19:37:52,692 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 19:37:52,714 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 19:37:52,714 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 19:37:52,715 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 19:37:52,715 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 19:37:52,716 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 19:37:52,716 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 19:37:52,716 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 19:37:52,716 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 19:37:52,716 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 19:37:52,717 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 19:37:52,717 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 19:37:52,717 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 19:37:52,717 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 19:37:52,717 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 19:37:52,718 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 19:37:52,718 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 19:37:52,718 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 19:37:52,718 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 19:37:52,718 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 19:37:52,719 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 19:37:52,719 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 19:37:52,719 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 19:37:52,719 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 19:37:52,719 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 19:37:52,720 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 19:37:52,720 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 19:37:52,720 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 19:37:52,720 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 19:37:52,720 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 19:37:52,720 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=HIGHLEXORDER; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=HIGHLEXORDER; [2020-08-18 19:37:53,066 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 19:37:53,083 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 19:37:53,087 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 19:37:53,089 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 19:37:53,089 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 19:37:53,090 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-18 19:37:53,165 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/00e688506/43701cc5dd464c3f8e06a73cad761fa8/FLAG5fb1c90e9 [2020-08-18 19:37:53,625 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 19:37:53,626 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-18 19:37:53,633 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/00e688506/43701cc5dd464c3f8e06a73cad761fa8/FLAG5fb1c90e9 [2020-08-18 19:37:54,122 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/00e688506/43701cc5dd464c3f8e06a73cad761fa8 [2020-08-18 19:37:54,133 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 19:37:54,134 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 19:37:54,135 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 19:37:54,136 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 19:37:54,139 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 19:37:54,140 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:37:54" (1/1) ... [2020-08-18 19:37:54,143 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17135c3e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:54, skipping insertion in model container [2020-08-18 19:37:54,143 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:37:54" (1/1) ... [2020-08-18 19:37:54,150 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 19:37:54,167 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 19:37:54,339 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 19:37:54,344 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 19:37:54,358 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 19:37:54,372 INFO L208 MainTranslator]: Completed translation [2020-08-18 19:37:54,373 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:54 WrapperNode [2020-08-18 19:37:54,373 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 19:37:54,374 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 19:37:54,374 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 19:37:54,374 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 19:37:54,386 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:54" (1/1) ... [2020-08-18 19:37:54,386 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:54" (1/1) ... [2020-08-18 19:37:54,467 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:54" (1/1) ... [2020-08-18 19:37:54,467 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:54" (1/1) ... [2020-08-18 19:37:54,471 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:54" (1/1) ... [2020-08-18 19:37:54,476 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:54" (1/1) ... [2020-08-18 19:37:54,476 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:54" (1/1) ... [2020-08-18 19:37:54,478 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 19:37:54,478 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 19:37:54,478 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 19:37:54,478 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 19:37:54,479 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:54" (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 19:37:54,538 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 19:37:54,538 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 19:37:54,538 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 19:37:54,539 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 19:37:54,539 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 19:37:54,539 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 19:37:54,539 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 19:37:54,539 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 19:37:54,539 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 19:37:54,539 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 19:37:54,540 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 19:37:54,540 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 19:37:54,540 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 19:37:54,784 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 19:37:54,784 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 19:37:54,789 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:37:54 BoogieIcfgContainer [2020-08-18 19:37:54,789 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 19:37:54,799 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 19:37:54,799 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 19:37:54,810 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 19:37:54,811 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 07:37:54" (1/3) ... [2020-08-18 19:37:54,812 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73d909a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:37:54, skipping insertion in model container [2020-08-18 19:37:54,812 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:54" (2/3) ... [2020-08-18 19:37:54,812 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73d909a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:37:54, skipping insertion in model container [2020-08-18 19:37:54,813 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:37:54" (3/3) ... [2020-08-18 19:37:54,817 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-18 19:37:54,841 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 19:37:54,859 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 19:37:54,874 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 19:37:54,896 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 19:37:54,896 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 19:37:54,896 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 19:37:54,896 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 19:37:54,897 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 19:37:54,897 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 19:37:54,897 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 19:37:54,897 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 19:37:54,912 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-18 19:37:54,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 19:37:54,918 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:54,919 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:54,919 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:54,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:54,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-18 19:37:54,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:54,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [663578812] [2020-08-18 19:37:54,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:55,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:55,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,035 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 19:37:55,036 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [663578812] [2020-08-18 19:37:55,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:37:55,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 19:37:55,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327408007] [2020-08-18 19:37:55,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 19:37:55,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:55,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 19:37:55,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 19:37:55,057 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-18 19:37:55,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:55,076 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-18 19:37:55,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 19:37:55,077 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-18 19:37:55,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:55,084 INFO L225 Difference]: With dead ends: 37 [2020-08-18 19:37:55,084 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 19:37:55,087 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 19:37:55,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 19:37:55,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 19:37:55,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 19:37:55,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-18 19:37:55,119 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-18 19:37:55,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:55,120 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-18 19:37:55,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 19:37:55,120 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-18 19:37:55,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 19:37:55,121 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:55,121 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:55,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 19:37:55,122 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:55,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:55,122 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-18 19:37:55,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:55,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1828328878] [2020-08-18 19:37:55,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:55,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:55,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,165 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 19:37:55,166 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1828328878] [2020-08-18 19:37:55,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:37:55,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 19:37:55,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010589655] [2020-08-18 19:37:55,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 19:37:55,168 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:55,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 19:37:55,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 19:37:55,169 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-18 19:37:55,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:55,192 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-18 19:37:55,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 19:37:55,193 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 19:37:55,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:55,194 INFO L225 Difference]: With dead ends: 20 [2020-08-18 19:37:55,194 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 19:37:55,195 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 19:37:55,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 19:37:55,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 19:37:55,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 19:37:55,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 19:37:55,201 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-18 19:37:55,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:55,201 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 19:37:55,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 19:37:55,202 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 19:37:55,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 19:37:55,202 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:55,203 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:55,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 19:37:55,203 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:55,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:55,204 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-18 19:37:55,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:55,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1226158655] [2020-08-18 19:37:55,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:55,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:55,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,242 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:55,242 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1226158655] [2020-08-18 19:37:55,242 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:37:55,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 19:37:55,243 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056250284] [2020-08-18 19:37:55,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 19:37:55,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:55,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 19:37:55,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 19:37:55,245 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-18 19:37:55,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:55,255 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-18 19:37:55,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 19:37:55,255 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-18 19:37:55,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:55,256 INFO L225 Difference]: With dead ends: 25 [2020-08-18 19:37:55,257 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 19:37:55,257 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 19:37:55,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 19:37:55,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 19:37:55,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 19:37:55,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 19:37:55,263 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-18 19:37:55,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:55,263 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 19:37:55,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 19:37:55,264 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 19:37:55,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 19:37:55,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:55,265 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:55,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 19:37:55,265 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:55,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:55,266 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-18 19:37:55,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:55,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2058061816] [2020-08-18 19:37:55,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:55,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:55,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,328 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:55,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2058061816] [2020-08-18 19:37:55,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:55,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 19:37:55,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144775116] [2020-08-18 19:37:55,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 19:37:55,331 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:55,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 19:37:55,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:37:55,332 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-18 19:37:55,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:55,400 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-18 19:37:55,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 19:37:55,401 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-18 19:37:55,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:55,402 INFO L225 Difference]: With dead ends: 26 [2020-08-18 19:37:55,402 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 19:37:55,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-08-18 19:37:55,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 19:37:55,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 19:37:55,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 19:37:55,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-18 19:37:55,409 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-18 19:37:55,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:55,410 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-18 19:37:55,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 19:37:55,410 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-18 19:37:55,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 19:37:55,411 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:55,411 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:55,411 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 19:37:55,412 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:55,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:55,412 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-18 19:37:55,413 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:55,413 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1285733812] [2020-08-18 19:37:55,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:55,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:55,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,479 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:55,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1285733812] [2020-08-18 19:37:55,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:55,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 19:37:55,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492744576] [2020-08-18 19:37:55,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 19:37:55,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:55,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 19:37:55,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 19:37:55,482 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-18 19:37:55,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:55,566 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-18 19:37:55,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 19:37:55,567 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-18 19:37:55,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:55,567 INFO L225 Difference]: With dead ends: 27 [2020-08-18 19:37:55,568 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 19:37:55,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-08-18 19:37:55,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 19:37:55,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 19:37:55,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 19:37:55,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-18 19:37:55,575 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-18 19:37:55,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:55,575 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-18 19:37:55,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 19:37:55,575 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-18 19:37:55,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 19:37:55,576 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:55,576 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:55,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 19:37:55,577 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:55,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:55,577 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-18 19:37:55,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:55,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [646357646] [2020-08-18 19:37:55,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:55,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:55,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,689 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:55,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [646357646] [2020-08-18 19:37:55,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:55,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 19:37:55,691 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907190742] [2020-08-18 19:37:55,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 19:37:55,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:55,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 19:37:55,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 19:37:55,694 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-18 19:37:55,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:55,830 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-18 19:37:55,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 19:37:55,833 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-18 19:37:55,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:55,834 INFO L225 Difference]: With dead ends: 28 [2020-08-18 19:37:55,834 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 19:37:55,836 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-18 19:37:55,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 19:37:55,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 19:37:55,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 19:37:55,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-18 19:37:55,848 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-18 19:37:55,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:55,848 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-18 19:37:55,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 19:37:55,849 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-18 19:37:55,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 19:37:55,850 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:55,854 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:55,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 19:37:55,854 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:55,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:55,855 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-18 19:37:55,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:55,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [239791994] [2020-08-18 19:37:55,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:55,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:55,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,960 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:55,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [239791994] [2020-08-18 19:37:55,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:55,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 19:37:55,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565146803] [2020-08-18 19:37:55,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 19:37:55,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:55,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 19:37:55,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-18 19:37:55,965 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-18 19:37:56,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:56,085 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 19:37:56,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 19:37:56,086 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-18 19:37:56,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:56,087 INFO L225 Difference]: With dead ends: 29 [2020-08-18 19:37:56,087 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 19:37:56,088 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-18 19:37:56,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 19:37:56,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 19:37:56,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 19:37:56,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-18 19:37:56,094 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-18 19:37:56,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:56,094 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-18 19:37:56,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 19:37:56,094 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-18 19:37:56,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 19:37:56,095 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:56,095 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:56,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 19:37:56,096 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:56,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:56,096 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-18 19:37:56,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:56,097 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [258881837] [2020-08-18 19:37:56,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:56,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:56,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,181 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:56,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [258881837] [2020-08-18 19:37:56,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:56,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 19:37:56,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764280685] [2020-08-18 19:37:56,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 19:37:56,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:56,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 19:37:56,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-18 19:37:56,184 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-18 19:37:56,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:56,324 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-18 19:37:56,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 19:37:56,325 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-18 19:37:56,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:56,326 INFO L225 Difference]: With dead ends: 30 [2020-08-18 19:37:56,326 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 19:37:56,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2020-08-18 19:37:56,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 19:37:56,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 19:37:56,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 19:37:56,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-18 19:37:56,332 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-18 19:37:56,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:56,333 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-18 19:37:56,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 19:37:56,333 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-18 19:37:56,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 19:37:56,334 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:56,334 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:56,334 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 19:37:56,334 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:56,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:56,335 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-18 19:37:56,335 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:56,335 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1589486758] [2020-08-18 19:37:56,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:56,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:56,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,371 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:37:56,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1589486758] [2020-08-18 19:37:56,371 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:56,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 19:37:56,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362276999] [2020-08-18 19:37:56,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 19:37:56,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:56,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 19:37:56,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 19:37:56,373 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-18 19:37:56,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:56,388 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-18 19:37:56,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 19:37:56,388 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 19:37:56,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:56,389 INFO L225 Difference]: With dead ends: 30 [2020-08-18 19:37:56,389 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 19:37:56,390 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 19:37:56,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 19:37:56,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 19:37:56,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 19:37:56,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-18 19:37:56,396 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-18 19:37:56,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:56,396 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-18 19:37:56,396 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 19:37:56,396 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-18 19:37:56,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 19:37:56,397 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:56,397 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:56,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 19:37:56,398 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:56,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:56,398 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-18 19:37:56,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:56,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1907778217] [2020-08-18 19:37:56,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:56,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:56,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,439 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:37:56,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1907778217] [2020-08-18 19:37:56,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:56,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 19:37:56,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932779068] [2020-08-18 19:37:56,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 19:37:56,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:56,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 19:37:56,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:37:56,441 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-18 19:37:56,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:56,459 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-18 19:37:56,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 19:37:56,460 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-18 19:37:56,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:56,460 INFO L225 Difference]: With dead ends: 34 [2020-08-18 19:37:56,461 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 19:37:56,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:37:56,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 19:37:56,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 19:37:56,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 19:37:56,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-18 19:37:56,467 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-18 19:37:56,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:56,467 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-18 19:37:56,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 19:37:56,468 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-18 19:37:56,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 19:37:56,468 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:56,469 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:56,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 19:37:56,469 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:56,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:56,469 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-18 19:37:56,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:56,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1531297665] [2020-08-18 19:37:56,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:56,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:56,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,523 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:37:56,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1531297665] [2020-08-18 19:37:56,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:56,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 19:37:56,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052732146] [2020-08-18 19:37:56,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 19:37:56,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:56,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 19:37:56,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-18 19:37:56,525 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-18 19:37:56,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:56,547 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-18 19:37:56,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 19:37:56,547 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-18 19:37:56,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:56,548 INFO L225 Difference]: With dead ends: 38 [2020-08-18 19:37:56,548 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 19:37:56,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-18 19:37:56,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 19:37:56,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 19:37:56,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 19:37:56,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-18 19:37:56,559 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-18 19:37:56,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:56,559 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-18 19:37:56,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 19:37:56,560 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-18 19:37:56,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 19:37:56,560 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:56,561 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:56,561 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 19:37:56,561 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:56,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:56,561 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-18 19:37:56,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:56,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [781963361] [2020-08-18 19:37:56,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:56,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:56,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,660 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:37:56,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [781963361] [2020-08-18 19:37:56,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:56,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 19:37:56,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39887953] [2020-08-18 19:37:56,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 19:37:56,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:56,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 19:37:56,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-18 19:37:56,662 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-18 19:37:56,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:56,851 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-18 19:37:56,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 19:37:56,851 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-18 19:37:56,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:56,852 INFO L225 Difference]: With dead ends: 54 [2020-08-18 19:37:56,852 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 19:37:56,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-18 19:37:56,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 19:37:56,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 19:37:56,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 19:37:56,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-18 19:37:56,860 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-18 19:37:56,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:56,861 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-18 19:37:56,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 19:37:56,861 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-18 19:37:56,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 19:37:56,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:56,862 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:56,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 19:37:56,863 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:56,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:56,863 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-18 19:37:56,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:56,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2010617056] [2020-08-18 19:37:56,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:56,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:56,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,975 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:37:56,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2010617056] [2020-08-18 19:37:56,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:56,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 19:37:56,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538716632] [2020-08-18 19:37:56,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 19:37:56,976 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:56,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 19:37:56,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-18 19:37:56,977 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-18 19:37:57,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:57,172 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-18 19:37:57,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 19:37:57,173 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-18 19:37:57,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:57,174 INFO L225 Difference]: With dead ends: 55 [2020-08-18 19:37:57,174 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 19:37:57,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2020-08-18 19:37:57,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 19:37:57,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 19:37:57,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 19:37:57,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-18 19:37:57,181 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-18 19:37:57,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:57,181 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-18 19:37:57,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 19:37:57,182 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-18 19:37:57,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 19:37:57,182 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:57,183 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:57,183 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 19:37:57,183 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:57,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:57,183 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-18 19:37:57,183 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:57,184 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1707399850] [2020-08-18 19:37:57,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:57,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:57,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,334 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:37:57,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1707399850] [2020-08-18 19:37:57,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:57,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 19:37:57,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009981579] [2020-08-18 19:37:57,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 19:37:57,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:57,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 19:37:57,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-18 19:37:57,336 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-18 19:37:57,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:57,574 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-18 19:37:57,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 19:37:57,575 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-18 19:37:57,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:57,576 INFO L225 Difference]: With dead ends: 56 [2020-08-18 19:37:57,576 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 19:37:57,577 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-08-18 19:37:57,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 19:37:57,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 19:37:57,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 19:37:57,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-18 19:37:57,589 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-18 19:37:57,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:57,590 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-18 19:37:57,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 19:37:57,590 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-18 19:37:57,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 19:37:57,591 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:57,591 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:57,591 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 19:37:57,591 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:57,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:57,593 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-18 19:37:57,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:57,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [751097388] [2020-08-18 19:37:57,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:57,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:57,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,763 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:37:57,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [751097388] [2020-08-18 19:37:57,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:57,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 19:37:57,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586901255] [2020-08-18 19:37:57,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 19:37:57,767 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:57,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 19:37:57,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-18 19:37:57,768 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-18 19:37:58,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:58,063 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-18 19:37:58,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 19:37:58,064 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-18 19:37:58,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:58,064 INFO L225 Difference]: With dead ends: 57 [2020-08-18 19:37:58,064 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 19:37:58,065 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2020-08-18 19:37:58,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 19:37:58,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 19:37:58,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 19:37:58,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-18 19:37:58,072 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-18 19:37:58,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:58,072 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-18 19:37:58,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 19:37:58,072 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-18 19:37:58,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 19:37:58,073 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:58,073 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:58,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 19:37:58,074 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:58,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:58,074 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-18 19:37:58,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:58,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [902359002] [2020-08-18 19:37:58,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:58,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:58,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:58,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:58,217 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:37:58,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [902359002] [2020-08-18 19:37:58,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:58,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 19:37:58,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328805922] [2020-08-18 19:37:58,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 19:37:58,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:58,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 19:37:58,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-18 19:37:58,219 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-18 19:37:58,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:58,594 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-18 19:37:58,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 19:37:58,595 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 19:37:58,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:58,596 INFO L225 Difference]: With dead ends: 58 [2020-08-18 19:37:58,597 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 19:37:58,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-08-18 19:37:58,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 19:37:58,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 19:37:58,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 19:37:58,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-18 19:37:58,617 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-18 19:37:58,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:58,618 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-18 19:37:58,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 19:37:58,618 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-18 19:37:58,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 19:37:58,619 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:58,619 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:58,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 19:37:58,619 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:58,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:58,620 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-18 19:37:58,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:58,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [811992948] [2020-08-18 19:37:58,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:58,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:58,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:58,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:58,795 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:37:58,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [811992948] [2020-08-18 19:37:58,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:58,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 19:37:58,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505473485] [2020-08-18 19:37:58,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 19:37:58,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:58,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 19:37:58,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-18 19:37:58,798 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-18 19:37:59,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:59,180 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-18 19:37:59,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 19:37:59,180 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-18 19:37:59,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:59,181 INFO L225 Difference]: With dead ends: 59 [2020-08-18 19:37:59,181 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 19:37:59,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-18 19:37:59,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 19:37:59,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 19:37:59,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 19:37:59,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-18 19:37:59,189 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-18 19:37:59,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:59,190 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-18 19:37:59,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 19:37:59,190 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-18 19:37:59,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 19:37:59,191 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:59,191 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:59,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 19:37:59,191 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:59,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:59,192 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-18 19:37:59,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:59,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [672456007] [2020-08-18 19:37:59,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:59,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:59,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:59,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:59,358 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:37:59,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [672456007] [2020-08-18 19:37:59,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:59,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 19:37:59,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662370593] [2020-08-18 19:37:59,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 19:37:59,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:59,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 19:37:59,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-18 19:37:59,363 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-18 19:37:59,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:59,850 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-18 19:37:59,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 19:37:59,851 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-18 19:37:59,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:59,852 INFO L225 Difference]: With dead ends: 60 [2020-08-18 19:37:59,852 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 19:37:59,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-18 19:37:59,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 19:37:59,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 19:37:59,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 19:37:59,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-18 19:37:59,861 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-18 19:37:59,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:59,862 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-18 19:37:59,862 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 19:37:59,862 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-18 19:37:59,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 19:37:59,863 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:59,863 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:59,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 19:37:59,863 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:59,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:59,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-18 19:37:59,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:59,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653804331] [2020-08-18 19:37:59,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:59,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:00,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:00,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:00,088 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:38:00,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653804331] [2020-08-18 19:38:00,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:00,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 19:38:00,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905731743] [2020-08-18 19:38:00,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 19:38:00,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:00,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 19:38:00,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-18 19:38:00,095 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-18 19:38:00,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:00,610 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-18 19:38:00,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 19:38:00,611 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-18 19:38:00,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:00,612 INFO L225 Difference]: With dead ends: 61 [2020-08-18 19:38:00,612 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 19:38:00,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-18 19:38:00,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 19:38:00,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 19:38:00,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 19:38:00,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-18 19:38:00,621 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-18 19:38:00,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:00,621 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-18 19:38:00,621 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 19:38:00,621 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-18 19:38:00,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 19:38:00,622 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:00,622 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:00,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 19:38:00,623 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:00,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:00,623 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-18 19:38:00,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:00,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1415405362] [2020-08-18 19:38:00,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:00,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:00,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:00,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:00,829 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:38:00,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1415405362] [2020-08-18 19:38:00,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:00,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 19:38:00,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814126137] [2020-08-18 19:38:00,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 19:38:00,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:00,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 19:38:00,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-18 19:38:00,831 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-18 19:38:01,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:01,368 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-18 19:38:01,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 19:38:01,369 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-18 19:38:01,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:01,369 INFO L225 Difference]: With dead ends: 62 [2020-08-18 19:38:01,370 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 19:38:01,371 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 19:38:01,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 19:38:01,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 19:38:01,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 19:38:01,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-18 19:38:01,378 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-18 19:38:01,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:01,378 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-18 19:38:01,379 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 19:38:01,379 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-18 19:38:01,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 19:38:01,379 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:01,379 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:01,380 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 19:38:01,380 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:01,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:01,380 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-18 19:38:01,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:01,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [985686797] [2020-08-18 19:38:01,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:01,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:01,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:01,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:01,603 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:38:01,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [985686797] [2020-08-18 19:38:01,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:01,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 19:38:01,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047516913] [2020-08-18 19:38:01,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 19:38:01,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:01,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 19:38:01,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-18 19:38:01,605 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-18 19:38:02,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:02,235 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-18 19:38:02,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 19:38:02,236 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-18 19:38:02,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:02,237 INFO L225 Difference]: With dead ends: 63 [2020-08-18 19:38:02,237 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 19:38:02,238 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 19:38:02,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 19:38:02,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 19:38:02,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 19:38:02,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-18 19:38:02,244 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-18 19:38:02,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:02,245 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-18 19:38:02,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 19:38:02,245 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-18 19:38:02,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 19:38:02,246 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:02,246 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:02,246 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 19:38:02,246 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:02,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:02,247 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-18 19:38:02,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:02,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284425198] [2020-08-18 19:38:02,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:02,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:02,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:02,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:02,551 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:38:02,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284425198] [2020-08-18 19:38:02,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:02,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 19:38:02,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071626844] [2020-08-18 19:38:02,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 19:38:02,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:02,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 19:38:02,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-18 19:38:02,554 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-18 19:38:03,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:03,228 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-18 19:38:03,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 19:38:03,230 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-18 19:38:03,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:03,231 INFO L225 Difference]: With dead ends: 64 [2020-08-18 19:38:03,231 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 19:38:03,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 19:38:03,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 19:38:03,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 19:38:03,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 19:38:03,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-18 19:38:03,238 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-18 19:38:03,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:03,239 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-18 19:38:03,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 19:38:03,239 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-18 19:38:03,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 19:38:03,240 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:03,240 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:03,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 19:38:03,240 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:03,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:03,241 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-18 19:38:03,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:03,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [821654742] [2020-08-18 19:38:03,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:03,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:03,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:03,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:03,508 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:38:03,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [821654742] [2020-08-18 19:38:03,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:03,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 19:38:03,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93634239] [2020-08-18 19:38:03,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 19:38:03,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:03,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 19:38:03,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-18 19:38:03,510 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-18 19:38:04,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:04,268 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-18 19:38:04,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 19:38:04,269 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-18 19:38:04,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:04,270 INFO L225 Difference]: With dead ends: 65 [2020-08-18 19:38:04,270 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 19:38:04,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 19:38:04,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 19:38:04,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 19:38:04,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 19:38:04,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-18 19:38:04,278 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-18 19:38:04,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:04,279 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-18 19:38:04,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 19:38:04,279 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-18 19:38:04,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 19:38:04,280 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:04,280 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:04,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 19:38:04,280 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:04,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:04,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-18 19:38:04,281 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:04,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1033060211] [2020-08-18 19:38:04,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:04,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:04,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:04,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:04,547 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:38:04,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1033060211] [2020-08-18 19:38:04,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:04,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 19:38:04,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659734936] [2020-08-18 19:38:04,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 19:38:04,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:04,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 19:38:04,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-18 19:38:04,550 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-18 19:38:05,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:05,433 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-18 19:38:05,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 19:38:05,439 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-18 19:38:05,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:05,440 INFO L225 Difference]: With dead ends: 66 [2020-08-18 19:38:05,440 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 19:38:05,441 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 19:38:05,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 19:38:05,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 19:38:05,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 19:38:05,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-18 19:38:05,447 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-18 19:38:05,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:05,447 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-18 19:38:05,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 19:38:05,448 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-18 19:38:05,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 19:38:05,448 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:05,448 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:05,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 19:38:05,449 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:05,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:05,449 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-18 19:38:05,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:05,449 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1535350503] [2020-08-18 19:38:05,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:05,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:05,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:05,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:05,768 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:38:05,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1535350503] [2020-08-18 19:38:05,768 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:05,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 19:38:05,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418897382] [2020-08-18 19:38:05,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 19:38:05,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:05,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 19:38:05,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-18 19:38:05,770 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-18 19:38:06,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:06,725 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-18 19:38:06,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 19:38:06,726 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-18 19:38:06,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:06,727 INFO L225 Difference]: With dead ends: 67 [2020-08-18 19:38:06,727 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 19:38:06,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 19:38:06,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 19:38:06,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 19:38:06,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 19:38:06,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-18 19:38:06,735 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-18 19:38:06,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:06,736 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-18 19:38:06,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 19:38:06,736 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-18 19:38:06,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 19:38:06,738 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:06,740 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:06,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 19:38:06,740 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:06,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:06,740 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-18 19:38:06,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:06,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1633634906] [2020-08-18 19:38:06,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:06,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:07,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:07,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:07,111 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:38:07,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1633634906] [2020-08-18 19:38:07,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:07,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 19:38:07,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666423208] [2020-08-18 19:38:07,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 19:38:07,113 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:07,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 19:38:07,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-18 19:38:07,113 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-18 19:38:08,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:08,258 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-18 19:38:08,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 19:38:08,260 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-18 19:38:08,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:08,261 INFO L225 Difference]: With dead ends: 68 [2020-08-18 19:38:08,261 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 19:38:08,262 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 19:38:08,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 19:38:08,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 19:38:08,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 19:38:08,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-18 19:38:08,269 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-18 19:38:08,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:08,269 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-18 19:38:08,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 19:38:08,269 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-18 19:38:08,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 19:38:08,270 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:08,270 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:08,270 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 19:38:08,271 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:08,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:08,271 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-18 19:38:08,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:08,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2010689919] [2020-08-18 19:38:08,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:08,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:08,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:08,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:08,651 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 19:38:08,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2010689919] [2020-08-18 19:38:08,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:08,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 19:38:08,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313706423] [2020-08-18 19:38:08,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 19:38:08,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:08,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 19:38:08,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-18 19:38:08,659 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-18 19:38:09,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:09,774 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-18 19:38:09,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 19:38:09,775 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-18 19:38:09,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:09,776 INFO L225 Difference]: With dead ends: 69 [2020-08-18 19:38:09,777 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 19:38:09,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 19:38:09,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 19:38:09,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 19:38:09,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 19:38:09,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-18 19:38:09,785 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-18 19:38:09,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:09,785 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-18 19:38:09,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 19:38:09,785 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-18 19:38:09,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 19:38:09,786 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:09,786 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:09,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 19:38:09,786 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:09,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:09,786 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-18 19:38:09,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:09,787 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1361091736] [2020-08-18 19:38:09,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:09,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:09,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:09,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:09,846 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-18 19:38:09,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1361091736] [2020-08-18 19:38:09,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:38:09,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 19:38:09,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338098166] [2020-08-18 19:38:09,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 19:38:09,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:09,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 19:38:09,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:38:09,848 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-18 19:38:09,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:09,871 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-18 19:38:09,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 19:38:09,871 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-18 19:38:09,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:09,872 INFO L225 Difference]: With dead ends: 66 [2020-08-18 19:38:09,872 INFO L226 Difference]: Without dead ends: 0 [2020-08-18 19:38:09,872 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 19:38:09,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-18 19:38:09,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-18 19:38:09,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-18 19:38:09,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-18 19:38:09,873 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-18 19:38:09,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:09,874 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-18 19:38:09,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 19:38:09,874 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-18 19:38:09,874 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-18 19:38:09,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 19:38:09,876 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-18 19:38:10,081 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 12 [2020-08-18 19:38:10,086 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-18 19:38:10,086 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-18 19:38:10,086 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-18 19:38:10,086 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-18 19:38:10,086 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-18 19:38:10,086 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-18 19:38:10,086 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-18 19:38:10,086 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-18 19:38:10,087 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-18 19:38:10,087 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-18 19:38:10,087 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-18 19:38:10,087 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-18 19:38:10,087 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-18 19:38:10,087 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-18 19:38:10,087 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-18 19:38:10,087 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (= main_~k~0 4) (and (<= main_~i~0 0) (<= (+ main_~j~0 100) 0))) [2020-08-18 19:38:10,087 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-18 19:38:10,088 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-18 19:38:10,088 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-18 19:38:10,088 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-18 19:38:10,088 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-18 19:38:10,088 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-18 19:38:10,088 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-18 19:38:10,088 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-18 19:38:10,088 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-18 19:38:10,104 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 07:38:10 BoogieIcfgContainer [2020-08-18 19:38:10,105 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 19:38:10,106 INFO L168 Benchmark]: Toolchain (without parser) took 15972.39 ms. Allocated memory was 145.2 MB in the beginning and 389.5 MB in the end (delta: 244.3 MB). Free memory was 101.6 MB in the beginning and 282.6 MB in the end (delta: -181.0 MB). Peak memory consumption was 63.3 MB. Max. memory is 7.1 GB. [2020-08-18 19:38:10,107 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 145.2 MB. Free memory was 119.8 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 19:38:10,108 INFO L168 Benchmark]: CACSL2BoogieTranslator took 238.35 ms. Allocated memory is still 145.2 MB. Free memory was 101.4 MB in the beginning and 92.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-18 19:38:10,109 INFO L168 Benchmark]: Boogie Preprocessor took 103.74 ms. Allocated memory was 145.2 MB in the beginning and 199.8 MB in the end (delta: 54.5 MB). Free memory was 92.1 MB in the beginning and 178.4 MB in the end (delta: -86.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-08-18 19:38:10,109 INFO L168 Benchmark]: RCFGBuilder took 311.32 ms. Allocated memory is still 199.8 MB. Free memory was 177.7 MB in the beginning and 165.3 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-08-18 19:38:10,110 INFO L168 Benchmark]: TraceAbstraction took 15305.83 ms. Allocated memory was 199.8 MB in the beginning and 389.5 MB in the end (delta: 189.8 MB). Free memory was 164.6 MB in the beginning and 282.6 MB in the end (delta: -118.0 MB). Peak memory consumption was 71.8 MB. Max. memory is 7.1 GB. [2020-08-18 19:38:10,113 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 145.2 MB. Free memory was 119.8 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 238.35 ms. Allocated memory is still 145.2 MB. Free memory was 101.4 MB in the beginning and 92.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 103.74 ms. Allocated memory was 145.2 MB in the beginning and 199.8 MB in the end (delta: 54.5 MB). Free memory was 92.1 MB in the beginning and 178.4 MB in the end (delta: -86.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 311.32 ms. Allocated memory is still 199.8 MB. Free memory was 177.7 MB in the beginning and 165.3 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 15305.83 ms. Allocated memory was 199.8 MB in the beginning and 389.5 MB in the end (delta: 189.8 MB). Free memory was 164.6 MB in the beginning and 282.6 MB in the end (delta: -118.0 MB). Peak memory consumption was 71.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: k == 4 - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: k == 4 || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: k == 4 || (i <= 0 && j + 100 <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 14.9s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 11.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 28 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 37 PreInvPairs, 73 NumberOfFragments, 31 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3216 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 3.9s InterpolantComputationTime, 871 NumberOfCodeBlocks, 871 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 100903 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 1512/3323 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...