/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 19:53:27,401 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 19:53:27,445 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 19:53:27,453 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 19:53:27,456 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 19:53:27,460 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 19:53:27,463 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 19:53:27,467 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 19:53:27,467 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 19:53:27,468 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 19:53:27,469 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 19:53:27,471 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 19:53:27,474 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 19:53:27,475 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 19:53:27,477 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 19:53:27,478 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 19:53:27,480 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 19:53:27,487 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 19:53:27,490 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 19:53:27,490 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 19:53:27,491 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 19:53:27,492 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 19:53:27,504 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 19:53:27,521 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 19:53:27,522 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 19:53:27,523 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 19:53:27,524 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 [2020-08-21 19:53:27,560 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 19:53:27,561 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 19:53:27,562 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 19:53:27,563 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 19:53:27,563 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 19:53:27,563 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 19:53:27,563 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 19:53:27,563 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 19:53:27,563 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 19:53:27,564 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 19:53:27,565 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 19:53:27,565 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 19:53:27,565 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 19:53:27,566 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 19:53:27,566 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 19:53:27,566 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 19:53:27,566 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 19:53:27,566 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 19:53:27,567 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 19:53:27,567 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 19:53:27,567 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 19:53:27,567 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:53:27,567 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 19:53:27,568 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 19:53:27,568 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 19:53:27,568 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 19:53:27,568 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 19:53:27,568 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 19:53:27,569 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 19:53:27,569 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=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; [2020-08-21 19:53:27,856 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 19:53:27,868 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 19:53:27,872 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 19:53:27,873 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 19:53:27,874 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 19:53:27,875 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-21 19:53:27,938 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/354f78809/591670de30b84182bd06be9a0f0da4d8/FLAG64a84c676 [2020-08-21 19:53:28,389 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 19:53:28,390 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-21 19:53:28,397 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/354f78809/591670de30b84182bd06be9a0f0da4d8/FLAG64a84c676 [2020-08-21 19:53:28,720 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/354f78809/591670de30b84182bd06be9a0f0da4d8 [2020-08-21 19:53:28,730 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 19:53:28,732 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 19:53:28,733 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 19:53:28,734 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 19:53:28,737 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 19:53:28,738 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:53:28" (1/1) ... [2020-08-21 19:53:28,741 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@391177e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:28, skipping insertion in model container [2020-08-21 19:53:28,742 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:53:28" (1/1) ... [2020-08-21 19:53:28,749 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 19:53:28,766 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 19:53:28,951 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:53:28,954 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 19:53:28,969 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:53:28,982 INFO L208 MainTranslator]: Completed translation [2020-08-21 19:53:28,982 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:28 WrapperNode [2020-08-21 19:53:28,982 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 19:53:28,983 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 19:53:28,983 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 19:53:28,983 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 19:53:28,995 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:28" (1/1) ... [2020-08-21 19:53:28,995 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:28" (1/1) ... [2020-08-21 19:53:29,000 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:28" (1/1) ... [2020-08-21 19:53:29,000 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:28" (1/1) ... [2020-08-21 19:53:29,004 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:28" (1/1) ... [2020-08-21 19:53:29,009 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:28" (1/1) ... [2020-08-21 19:53:29,010 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:28" (1/1) ... [2020-08-21 19:53:29,101 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 19:53:29,101 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 19:53:29,101 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 19:53:29,102 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 19:53:29,105 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:28" (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 [2020-08-21 19:53:29,158 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 19:53:29,158 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 19:53:29,158 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 19:53:29,159 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 19:53:29,159 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 19:53:29,159 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 19:53:29,159 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 19:53:29,159 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 19:53:29,159 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 19:53:29,160 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 19:53:29,160 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 19:53:29,160 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 19:53:29,160 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 19:53:29,392 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 19:53:29,393 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 19:53:29,397 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:53:29 BoogieIcfgContainer [2020-08-21 19:53:29,398 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 19:53:29,400 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 19:53:29,400 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 19:53:29,418 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 19:53:29,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:53:28" (1/3) ... [2020-08-21 19:53:29,421 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e730f4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:53:29, skipping insertion in model container [2020-08-21 19:53:29,421 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:28" (2/3) ... [2020-08-21 19:53:29,422 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e730f4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:53:29, skipping insertion in model container [2020-08-21 19:53:29,422 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:53:29" (3/3) ... [2020-08-21 19:53:29,427 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-21 19:53:29,450 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 19:53:29,457 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 19:53:29,478 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 19:53:29,502 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 19:53:29,503 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 19:53:29,503 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 19:53:29,503 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 19:53:29,503 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 19:53:29,503 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 19:53:29,504 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 19:53:29,504 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 19:53:29,523 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-21 19:53:29,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 19:53:29,529 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:29,530 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:29,530 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:29,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:29,536 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-21 19:53:29,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:29,543 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207440834] [2020-08-21 19:53:29,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:29,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:29,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:29,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:29,649 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:29,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207440834] [2020-08-21 19:53:29,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:53:29,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 19:53:29,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421260764] [2020-08-21 19:53:29,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 19:53:29,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:29,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 19:53:29,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 19:53:29,670 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-21 19:53:29,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:29,689 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-21 19:53:29,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 19:53:29,690 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-21 19:53:29,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:29,698 INFO L225 Difference]: With dead ends: 35 [2020-08-21 19:53:29,698 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 19:53:29,702 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 [2020-08-21 19:53:29,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 19:53:29,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 19:53:29,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 19:53:29,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 19:53:29,734 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-21 19:53:29,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:29,735 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 19:53:29,735 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 19:53:29,735 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 19:53:29,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 19:53:29,736 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:29,736 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:29,737 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 19:53:29,737 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:29,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:29,738 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-21 19:53:29,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:29,738 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493102729] [2020-08-21 19:53:29,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:29,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:29,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:29,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:29,786 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:29,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [493102729] [2020-08-21 19:53:29,787 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:53:29,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 19:53:29,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157534869] [2020-08-21 19:53:29,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 19:53:29,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:29,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 19:53:29,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:53:29,791 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-21 19:53:29,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:29,814 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-21 19:53:29,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 19:53:29,815 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-21 19:53:29,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:29,816 INFO L225 Difference]: With dead ends: 24 [2020-08-21 19:53:29,817 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 19:53:29,818 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 [2020-08-21 19:53:29,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 19:53:29,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 19:53:29,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 19:53:29,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-21 19:53:29,823 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-21 19:53:29,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:29,823 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-21 19:53:29,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 19:53:29,824 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-21 19:53:29,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 19:53:29,824 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:29,825 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:29,825 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 19:53:29,826 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:29,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:29,827 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-21 19:53:29,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:29,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1245180559] [2020-08-21 19:53:29,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:29,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:30,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,068 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:30,069 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1245180559] [2020-08-21 19:53:30,069 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:53:30,069 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 19:53:30,070 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497919996] [2020-08-21 19:53:30,070 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:53:30,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:30,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:53:30,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:53:30,072 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-21 19:53:30,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:30,112 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-21 19:53:30,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:53:30,113 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 19:53:30,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:30,114 INFO L225 Difference]: With dead ends: 23 [2020-08-21 19:53:30,114 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 19:53:30,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:53:30,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 19:53:30,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 19:53:30,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 19:53:30,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-21 19:53:30,120 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-21 19:53:30,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:30,120 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-21 19:53:30,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:53:30,121 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-21 19:53:30,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 19:53:30,121 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:30,122 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:30,122 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 19:53:30,122 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:30,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:30,123 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-21 19:53:30,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:30,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1823295934] [2020-08-21 19:53:30,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:30,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,319 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 15 [2020-08-21 19:53:30,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:30,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,325 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:30,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1823295934] [2020-08-21 19:53:30,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:53:30,326 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 19:53:30,326 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893447197] [2020-08-21 19:53:30,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:53:30,327 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:30,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:53:30,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:53:30,328 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-21 19:53:30,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:30,350 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-21 19:53:30,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:53:30,351 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-21 19:53:30,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:30,352 INFO L225 Difference]: With dead ends: 26 [2020-08-21 19:53:30,352 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 19:53:30,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:53:30,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 19:53:30,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 19:53:30,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 19:53:30,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 19:53:30,358 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-21 19:53:30,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:30,358 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 19:53:30,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 19:53:30,358 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 19:53:30,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 19:53:30,359 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:30,359 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:30,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 19:53:30,360 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:30,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:30,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-21 19:53:30,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:30,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [461286312] [2020-08-21 19:53:30,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:30,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:30,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,645 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:30,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [461286312] [2020-08-21 19:53:30,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:30,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 19:53:30,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102487864] [2020-08-21 19:53:30,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 19:53:30,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:30,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 19:53:30,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:53:30,660 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-21 19:53:30,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:30,757 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 19:53:30,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:53:30,758 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-21 19:53:30,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:30,759 INFO L225 Difference]: With dead ends: 26 [2020-08-21 19:53:30,759 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 19:53:30,760 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:53:30,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 19:53:30,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 19:53:30,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 19:53:30,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 19:53:30,766 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-21 19:53:30,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:30,766 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 19:53:30,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 19:53:30,766 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 19:53:30,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 19:53:30,767 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:30,767 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:30,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 19:53:30,768 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:30,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:30,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-21 19:53:30,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:30,769 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1709673711] [2020-08-21 19:53:30,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:30,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:31,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:31,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:31,013 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:31,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1709673711] [2020-08-21 19:53:31,014 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:31,014 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 19:53:31,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168736026] [2020-08-21 19:53:31,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 19:53:31,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:31,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 19:53:31,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:53:31,016 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-21 19:53:31,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:31,193 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 19:53:31,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 19:53:31,194 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-21 19:53:31,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:31,195 INFO L225 Difference]: With dead ends: 29 [2020-08-21 19:53:31,195 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 19:53:31,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:53:31,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 19:53:31,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 19:53:31,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 19:53:31,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 19:53:31,212 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-21 19:53:31,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:31,212 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 19:53:31,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 19:53:31,212 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 19:53:31,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 19:53:31,213 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:31,213 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:31,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 19:53:31,217 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:31,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:31,218 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-21 19:53:31,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:31,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [655293554] [2020-08-21 19:53:31,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:31,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:31,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:31,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:31,563 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:31,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [655293554] [2020-08-21 19:53:31,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:31,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 19:53:31,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379268345] [2020-08-21 19:53:31,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 19:53:31,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:31,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 19:53:31,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:53:31,567 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-21 19:53:40,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:40,093 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 19:53:40,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 19:53:40,095 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-21 19:53:40,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:40,097 INFO L225 Difference]: With dead ends: 32 [2020-08-21 19:53:40,097 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 19:53:40,098 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=33, Invalid=147, Unknown=2, NotChecked=0, Total=182 [2020-08-21 19:53:40,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 19:53:40,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 19:53:40,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 19:53:40,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 19:53:40,102 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-21 19:53:40,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:40,103 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 19:53:40,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 19:53:40,103 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 19:53:40,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 19:53:40,104 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:40,104 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:40,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 19:53:40,105 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:40,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:40,105 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-21 19:53:40,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:40,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642985956] [2020-08-21 19:53:40,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:40,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:40,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:40,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:40,473 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:40,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642985956] [2020-08-21 19:53:40,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:40,474 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 19:53:40,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935459410] [2020-08-21 19:53:40,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 19:53:40,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:40,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 19:53:40,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:53:40,479 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-21 19:53:40,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:40,728 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 19:53:40,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 19:53:40,729 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-21 19:53:40,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:40,730 INFO L225 Difference]: With dead ends: 35 [2020-08-21 19:53:40,730 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 19:53:40,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:53:40,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 19:53:40,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 19:53:40,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 19:53:40,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 19:53:40,735 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-21 19:53:40,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:40,736 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 19:53:40,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 19:53:40,736 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 19:53:40,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 19:53:40,737 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:40,737 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:40,737 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 19:53:40,738 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:40,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:40,738 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-21 19:53:40,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:40,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [185470884] [2020-08-21 19:53:40,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:40,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:41,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:41,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:41,155 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:41,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [185470884] [2020-08-21 19:53:41,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:41,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 19:53:41,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139987702] [2020-08-21 19:53:41,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 19:53:41,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:41,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 19:53:41,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:53:41,158 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-21 19:53:47,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:47,914 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 19:53:47,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 19:53:47,914 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-21 19:53:47,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:47,915 INFO L225 Difference]: With dead ends: 38 [2020-08-21 19:53:47,915 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 19:53:47,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2020-08-21 19:53:47,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 19:53:47,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 19:53:47,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 19:53:47,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 19:53:47,921 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-21 19:53:47,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:47,921 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 19:53:47,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 19:53:47,921 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 19:53:47,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 19:53:47,922 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:47,923 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:47,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 19:53:47,923 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:47,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:47,923 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-21 19:53:47,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:47,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1184050805] [2020-08-21 19:53:47,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:47,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:48,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:48,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:48,425 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:48,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1184050805] [2020-08-21 19:53:48,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:48,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 19:53:48,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308282936] [2020-08-21 19:53:48,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 19:53:48,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:48,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 19:53:48,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:53:48,429 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-21 19:53:55,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:55,036 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 19:53:55,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 19:53:55,036 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-21 19:53:55,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:55,037 INFO L225 Difference]: With dead ends: 41 [2020-08-21 19:53:55,038 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 19:53:55,038 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-21 19:53:55,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 19:53:55,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 19:53:55,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 19:53:55,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 19:53:55,043 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-21 19:53:55,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:55,043 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 19:53:55,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 19:53:55,044 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 19:53:55,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 19:53:55,045 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:55,045 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:55,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 19:53:55,045 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:55,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:55,046 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-21 19:53:55,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:55,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1075837549] [2020-08-21 19:53:55,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:55,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:55,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:55,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:55,563 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:55,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1075837549] [2020-08-21 19:53:55,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:55,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 19:53:55,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704660138] [2020-08-21 19:53:55,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 19:53:55,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:55,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 19:53:55,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:53:55,566 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-21 19:54:08,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:54:08,393 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 19:54:08,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 19:54:08,393 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-21 19:54:08,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:54:08,394 INFO L225 Difference]: With dead ends: 44 [2020-08-21 19:54:08,395 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 19:54:08,396 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=49, Invalid=410, Unknown=3, NotChecked=0, Total=462 [2020-08-21 19:54:08,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 19:54:08,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 19:54:08,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 19:54:08,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 19:54:08,401 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-21 19:54:08,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:54:08,401 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 19:54:08,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 19:54:08,401 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 19:54:08,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 19:54:08,402 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:54:08,402 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:54:08,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 19:54:08,403 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:54:08,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:54:08,403 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-21 19:54:08,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:54:08,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [600387031] [2020-08-21 19:54:08,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:54:08,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:09,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:54:09,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:09,016 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:54:09,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [600387031] [2020-08-21 19:54:09,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:54:09,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 19:54:09,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247235463] [2020-08-21 19:54:09,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 19:54:09,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:54:09,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 19:54:09,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:54:09,018 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-21 19:54:09,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:54:09,446 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 19:54:09,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 19:54:09,449 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-21 19:54:09,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:54:09,449 INFO L225 Difference]: With dead ends: 47 [2020-08-21 19:54:09,450 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 19:54:09,451 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-21 19:54:09,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 19:54:09,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 19:54:09,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 19:54:09,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 19:54:09,455 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-21 19:54:09,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:54:09,455 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 19:54:09,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 19:54:09,455 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 19:54:09,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 19:54:09,456 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:54:09,457 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:54:09,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 19:54:09,457 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:54:09,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:54:09,457 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-21 19:54:09,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:54:09,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1037124] [2020-08-21 19:54:09,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:54:09,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:10,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:54:10,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:10,140 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:54:10,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1037124] [2020-08-21 19:54:10,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:54:10,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 19:54:10,141 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425304528] [2020-08-21 19:54:10,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 19:54:10,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:54:10,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 19:54:10,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:54:10,142 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-21 19:54:33,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:54:33,507 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 19:54:33,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 19:54:33,507 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-21 19:54:33,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:54:33,508 INFO L225 Difference]: With dead ends: 50 [2020-08-21 19:54:33,508 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 19:54:33,509 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=57, Invalid=590, Unknown=3, NotChecked=0, Total=650 [2020-08-21 19:54:33,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 19:54:33,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 19:54:33,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 19:54:33,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 19:54:33,514 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-21 19:54:33,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:54:33,514 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 19:54:33,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 19:54:33,514 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 19:54:33,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 19:54:33,517 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:54:33,517 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:54:33,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 19:54:33,517 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:54:33,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:54:33,518 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-21 19:54:33,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:54:33,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052955195] [2020-08-21 19:54:33,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:54:33,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:34,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:54:34,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:34,349 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:54:34,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052955195] [2020-08-21 19:54:34,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:54:34,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 19:54:34,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973138473] [2020-08-21 19:54:34,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 19:54:34,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:54:34,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 19:54:34,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-21 19:54:34,351 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states.