/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=LOWLEXORDER -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 18:49:33,509 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 18:49:33,512 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 18:49:33,549 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 18:49:33,549 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 18:49:33,558 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 18:49:33,560 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 18:49:33,563 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 18:49:33,565 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 18:49:33,568 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 18:49:33,569 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 18:49:33,569 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 18:49:33,570 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 18:49:33,572 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 18:49:33,574 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 18:49:33,575 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 18:49:33,577 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 18:49:33,577 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 18:49:33,579 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 18:49:33,586 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 18:49:33,588 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 18:49:33,589 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 18:49:33,590 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 18:49:33,591 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 18:49:33,605 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 18:49:33,621 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 18:49:33,622 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 18:49:33,623 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 18:49:33,623 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 18:49:33,651 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 18:49:33,651 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 18:49:33,653 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 18:49:33,653 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 18:49:33,653 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 18:49:33,653 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 18:49:33,654 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 18:49:33,654 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 18:49:33,654 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 18:49:33,654 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 18:49:33,654 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 18:49:33,655 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 18:49:33,655 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 18:49:33,655 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 18:49:33,655 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 18:49:33,655 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 18:49:33,656 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 18:49:33,656 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 18:49:33,656 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 18:49:33,656 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 18:49:33,656 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 18:49:33,657 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 18:49:33,657 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 18:49:33,657 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 18:49:33,657 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 18:49:33,658 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 18:49:33,658 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 18:49:33,658 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 18:49:33,658 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 18:49:33,658 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=LOWLEXORDER; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=LOWLEXORDER; [2020-08-18 18:49:33,961 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 18:49:33,974 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 18:49:33,979 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 18:49:33,981 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 18:49:33,982 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 18:49:33,983 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-18 18:49:34,040 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9f05d6b0b/d205605b9e8d41f4a6e3e6c28081d3ea/FLAGf427dd0dc [2020-08-18 18:49:34,494 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 18:49:34,495 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-18 18:49:34,501 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9f05d6b0b/d205605b9e8d41f4a6e3e6c28081d3ea/FLAGf427dd0dc [2020-08-18 18:49:34,878 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9f05d6b0b/d205605b9e8d41f4a6e3e6c28081d3ea [2020-08-18 18:49:34,888 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 18:49:34,890 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 18:49:34,891 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 18:49:34,892 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 18:49:34,895 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 18:49:34,896 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:49:34" (1/1) ... [2020-08-18 18:49:34,899 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@218f381a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:34, skipping insertion in model container [2020-08-18 18:49:34,899 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:49:34" (1/1) ... [2020-08-18 18:49:34,907 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 18:49:34,925 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 18:49:35,088 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:49:35,093 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 18:49:35,110 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:49:35,122 INFO L208 MainTranslator]: Completed translation [2020-08-18 18:49:35,122 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:35 WrapperNode [2020-08-18 18:49:35,122 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 18:49:35,123 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 18:49:35,123 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 18:49:35,123 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 18:49:35,133 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:35" (1/1) ... [2020-08-18 18:49:35,133 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:35" (1/1) ... [2020-08-18 18:49:35,224 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:35" (1/1) ... [2020-08-18 18:49:35,224 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:35" (1/1) ... [2020-08-18 18:49:35,228 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:35" (1/1) ... [2020-08-18 18:49:35,234 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:35" (1/1) ... [2020-08-18 18:49:35,235 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:35" (1/1) ... [2020-08-18 18:49:35,236 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 18:49:35,237 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 18:49:35,237 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 18:49:35,237 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 18:49:35,238 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:35" (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 18:49:35,302 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 18:49:35,302 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 18:49:35,302 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 18:49:35,304 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 18:49:35,305 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 18:49:35,305 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 18:49:35,305 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 18:49:35,305 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 18:49:35,305 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 18:49:35,306 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 18:49:35,307 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 18:49:35,307 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 18:49:35,307 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 18:49:35,501 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 18:49:35,502 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 18:49:35,506 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:49:35 BoogieIcfgContainer [2020-08-18 18:49:35,506 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 18:49:35,508 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 18:49:35,508 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 18:49:35,511 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 18:49:35,512 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 06:49:34" (1/3) ... [2020-08-18 18:49:35,513 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22210b7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:49:35, skipping insertion in model container [2020-08-18 18:49:35,513 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:35" (2/3) ... [2020-08-18 18:49:35,513 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22210b7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:49:35, skipping insertion in model container [2020-08-18 18:49:35,513 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:49:35" (3/3) ... [2020-08-18 18:49:35,515 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-18 18:49:35,527 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 18:49:35,536 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 18:49:35,552 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 18:49:35,625 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 18:49:35,625 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 18:49:35,625 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 18:49:35,626 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 18:49:35,628 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 18:49:35,628 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 18:49:35,628 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 18:49:35,628 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 18:49:35,651 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-18 18:49:35,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 18:49:35,662 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:35,663 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:35,665 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:35,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:35,672 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-18 18:49:35,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:35,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1422325501] [2020-08-18 18:49:35,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:35,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:35,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:35,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:35,784 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 18:49:35,785 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1422325501] [2020-08-18 18:49:35,787 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:49:35,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 18:49:35,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175434784] [2020-08-18 18:49:35,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 18:49:35,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:35,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 18:49:35,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 18:49:35,806 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-18 18:49:35,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:35,828 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-18 18:49:35,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 18:49:35,829 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-18 18:49:35,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:35,836 INFO L225 Difference]: With dead ends: 37 [2020-08-18 18:49:35,837 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 18:49:35,840 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 18:49:35,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 18:49:35,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 18:49:35,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 18:49:35,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-18 18:49:35,875 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-18 18:49:35,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:35,875 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-18 18:49:35,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 18:49:35,876 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-18 18:49:35,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 18:49:35,877 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:35,877 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:35,877 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 18:49:35,878 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:35,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:35,878 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-18 18:49:35,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:35,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [666341871] [2020-08-18 18:49:35,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:35,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:35,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:35,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:35,938 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 18:49:35,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [666341871] [2020-08-18 18:49:35,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:49:35,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 18:49:35,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254297784] [2020-08-18 18:49:35,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 18:49:35,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:35,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 18:49:35,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 18:49:35,942 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-18 18:49:35,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:35,990 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-18 18:49:35,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 18:49:35,991 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 18:49:35,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:35,992 INFO L225 Difference]: With dead ends: 20 [2020-08-18 18:49:35,993 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 18:49:35,994 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 18:49:35,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 18:49:35,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 18:49:35,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 18:49:35,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 18:49:36,000 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-18 18:49:36,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:36,000 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 18:49:36,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 18:49:36,001 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 18:49:36,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 18:49:36,004 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:36,005 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:36,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 18:49:36,005 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:36,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:36,006 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-18 18:49:36,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:36,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1657036927] [2020-08-18 18:49:36,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:36,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:36,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,088 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 18:49:36,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1657036927] [2020-08-18 18:49:36,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:49:36,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 18:49:36,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803257562] [2020-08-18 18:49:36,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 18:49:36,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:36,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 18:49:36,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 18:49:36,093 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-18 18:49:36,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:36,127 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-18 18:49:36,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 18:49:36,128 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-18 18:49:36,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:36,129 INFO L225 Difference]: With dead ends: 25 [2020-08-18 18:49:36,129 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 18:49:36,130 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 18:49:36,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 18:49:36,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 18:49:36,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 18:49:36,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 18:49:36,140 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-18 18:49:36,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:36,141 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 18:49:36,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 18:49:36,141 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 18:49:36,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 18:49:36,142 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:36,142 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:36,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 18:49:36,143 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:36,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:36,143 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-18 18:49:36,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:36,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [637628599] [2020-08-18 18:49:36,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:36,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:36,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,228 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 18:49:36,228 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [637628599] [2020-08-18 18:49:36,228 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:36,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 18:49:36,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471979414] [2020-08-18 18:49:36,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 18:49:36,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:36,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 18:49:36,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 18:49:36,231 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-18 18:49:36,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:36,292 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-18 18:49:36,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:49:36,293 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-18 18:49:36,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:36,294 INFO L225 Difference]: With dead ends: 26 [2020-08-18 18:49:36,294 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 18:49:36,295 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 18:49:36,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 18:49:36,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 18:49:36,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 18:49:36,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-18 18:49:36,302 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-18 18:49:36,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:36,303 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-18 18:49:36,303 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 18:49:36,303 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-18 18:49:36,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 18:49:36,304 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:36,304 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:36,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 18:49:36,305 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:36,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:36,305 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-18 18:49:36,306 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:36,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [198594919] [2020-08-18 18:49:36,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:36,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:36,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,367 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 18:49:36,368 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [198594919] [2020-08-18 18:49:36,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:36,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 18:49:36,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372252053] [2020-08-18 18:49:36,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 18:49:36,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:36,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 18:49:36,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 18:49:36,370 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-18 18:49:36,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:36,459 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-18 18:49:36,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 18:49:36,460 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-18 18:49:36,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:36,461 INFO L225 Difference]: With dead ends: 27 [2020-08-18 18:49:36,461 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 18:49:36,462 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 18:49:36,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 18:49:36,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 18:49:36,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 18:49:36,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-18 18:49:36,468 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-18 18:49:36,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:36,468 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-18 18:49:36,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 18:49:36,468 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-18 18:49:36,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 18:49:36,469 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:36,469 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:36,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 18:49:36,470 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:36,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:36,470 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-18 18:49:36,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:36,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1946561953] [2020-08-18 18:49:36,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:36,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:36,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,541 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 18:49:36,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1946561953] [2020-08-18 18:49:36,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:36,542 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 18:49:36,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131682930] [2020-08-18 18:49:36,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 18:49:36,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:36,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 18:49:36,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 18:49:36,545 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-18 18:49:36,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:36,654 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-18 18:49:36,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 18:49:36,656 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-18 18:49:36,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:36,657 INFO L225 Difference]: With dead ends: 28 [2020-08-18 18:49:36,658 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 18:49:36,659 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 18:49:36,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 18:49:36,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 18:49:36,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 18:49:36,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-18 18:49:36,674 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-18 18:49:36,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:36,674 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-18 18:49:36,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 18:49:36,674 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-18 18:49:36,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 18:49:36,677 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:36,677 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:36,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 18:49:36,678 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:36,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:36,678 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-18 18:49:36,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:36,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1462460976] [2020-08-18 18:49:36,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:36,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:36,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,763 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 18:49:36,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1462460976] [2020-08-18 18:49:36,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:36,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 18:49:36,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281071012] [2020-08-18 18:49:36,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 18:49:36,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:36,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 18:49:36,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-18 18:49:36,765 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-18 18:49:36,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:36,881 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 18:49:36,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 18:49:36,882 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-18 18:49:36,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:36,882 INFO L225 Difference]: With dead ends: 29 [2020-08-18 18:49:36,883 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 18:49:36,883 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 18:49:36,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 18:49:36,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 18:49:36,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 18:49:36,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-18 18:49:36,888 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-18 18:49:36,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:36,889 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-18 18:49:36,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 18:49:36,889 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-18 18:49:36,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 18:49:36,890 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:36,890 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:36,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 18:49:36,890 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:36,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:36,891 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-18 18:49:36,891 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:36,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [197929612] [2020-08-18 18:49:36,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:36,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:36,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,965 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 18:49:36,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [197929612] [2020-08-18 18:49:36,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:36,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 18:49:36,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686217548] [2020-08-18 18:49:36,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 18:49:36,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:36,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 18:49:36,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-18 18:49:36,968 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-18 18:49:37,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:37,121 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-18 18:49:37,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 18:49:37,121 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-18 18:49:37,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:37,122 INFO L225 Difference]: With dead ends: 30 [2020-08-18 18:49:37,123 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 18:49:37,123 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 18:49:37,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 18:49:37,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 18:49:37,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 18:49:37,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-18 18:49:37,129 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-18 18:49:37,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:37,129 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-18 18:49:37,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 18:49:37,129 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-18 18:49:37,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 18:49:37,130 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:37,130 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:37,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 18:49:37,131 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:37,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:37,131 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-18 18:49:37,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:37,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2036086124] [2020-08-18 18:49:37,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:37,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:37,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:37,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:37,162 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 18:49:37,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2036086124] [2020-08-18 18:49:37,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:37,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 18:49:37,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694365795] [2020-08-18 18:49:37,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 18:49:37,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:37,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 18:49:37,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 18:49:37,165 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-18 18:49:37,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:37,182 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-18 18:49:37,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 18:49:37,183 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 18:49:37,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:37,184 INFO L225 Difference]: With dead ends: 30 [2020-08-18 18:49:37,184 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 18:49:37,184 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 18:49:37,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 18:49:37,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 18:49:37,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 18:49:37,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-18 18:49:37,190 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-18 18:49:37,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:37,190 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-18 18:49:37,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 18:49:37,191 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-18 18:49:37,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 18:49:37,191 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:37,192 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:37,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 18:49:37,192 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:37,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:37,193 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-18 18:49:37,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:37,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [396685055] [2020-08-18 18:49:37,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:37,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:37,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:37,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:37,231 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 18:49:37,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [396685055] [2020-08-18 18:49:37,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:37,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 18:49:37,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449478630] [2020-08-18 18:49:37,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 18:49:37,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:37,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 18:49:37,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-18 18:49:37,233 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-18 18:49:37,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:37,252 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-18 18:49:37,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:49:37,253 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-18 18:49:37,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:37,254 INFO L225 Difference]: With dead ends: 34 [2020-08-18 18:49:37,254 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 18:49:37,254 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 18:49:37,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 18:49:37,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 18:49:37,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 18:49:37,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-18 18:49:37,260 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-18 18:49:37,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:37,260 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-18 18:49:37,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 18:49:37,261 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-18 18:49:37,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 18:49:37,261 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:37,262 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:37,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 18:49:37,262 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:37,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:37,262 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-18 18:49:37,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:37,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2097718578] [2020-08-18 18:49:37,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:37,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:37,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:37,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:37,312 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 18:49:37,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2097718578] [2020-08-18 18:49:37,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:37,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 18:49:37,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040463069] [2020-08-18 18:49:37,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 18:49:37,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:37,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 18:49:37,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-18 18:49:37,316 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-18 18:49:37,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:37,346 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-18 18:49:37,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 18:49:37,348 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-18 18:49:37,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:37,349 INFO L225 Difference]: With dead ends: 38 [2020-08-18 18:49:37,349 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 18:49:37,352 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 18:49:37,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 18:49:37,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 18:49:37,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 18:49:37,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-18 18:49:37,362 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-18 18:49:37,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:37,363 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-18 18:49:37,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 18:49:37,363 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-18 18:49:37,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 18:49:37,364 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:37,364 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:37,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 18:49:37,365 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:37,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:37,366 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-18 18:49:37,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:37,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [273001800] [2020-08-18 18:49:37,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:37,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:37,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:37,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:37,515 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 18:49:37,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [273001800] [2020-08-18 18:49:37,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:37,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 18:49:37,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617564788] [2020-08-18 18:49:37,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 18:49:37,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:37,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 18:49:37,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-18 18:49:37,518 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-18 18:49:37,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:37,734 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-18 18:49:37,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 18:49:37,734 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-18 18:49:37,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:37,735 INFO L225 Difference]: With dead ends: 54 [2020-08-18 18:49:37,735 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 18:49:37,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-18 18:49:37,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 18:49:37,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 18:49:37,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 18:49:37,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-18 18:49:37,750 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-18 18:49:37,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:37,750 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-18 18:49:37,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 18:49:37,750 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-18 18:49:37,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 18:49:37,753 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:37,754 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:37,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 18:49:37,754 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:37,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:37,754 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-18 18:49:37,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:37,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050881617] [2020-08-18 18:49:37,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:37,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:37,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:37,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:37,885 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 18:49:37,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050881617] [2020-08-18 18:49:37,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:37,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 18:49:37,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909599253] [2020-08-18 18:49:37,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 18:49:37,887 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:37,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 18:49:37,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-18 18:49:37,887 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-18 18:49:38,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:38,107 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-18 18:49:38,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 18:49:38,108 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-18 18:49:38,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:38,108 INFO L225 Difference]: With dead ends: 55 [2020-08-18 18:49:38,109 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 18:49:38,109 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 18:49:38,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 18:49:38,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 18:49:38,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 18:49:38,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-18 18:49:38,115 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-18 18:49:38,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:38,116 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-18 18:49:38,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 18:49:38,116 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-18 18:49:38,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 18:49:38,117 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:38,117 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:38,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 18:49:38,117 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:38,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:38,118 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-18 18:49:38,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:38,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1364685994] [2020-08-18 18:49:38,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:38,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:38,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:38,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:38,222 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 18:49:38,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1364685994] [2020-08-18 18:49:38,222 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:38,222 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 18:49:38,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718440354] [2020-08-18 18:49:38,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 18:49:38,223 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:38,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 18:49:38,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-18 18:49:38,224 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-18 18:49:38,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:38,478 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-18 18:49:38,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 18:49:38,479 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-18 18:49:38,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:38,480 INFO L225 Difference]: With dead ends: 56 [2020-08-18 18:49:38,480 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 18:49:38,481 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 18:49:38,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 18:49:38,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 18:49:38,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 18:49:38,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-18 18:49:38,488 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-18 18:49:38,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:38,488 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-18 18:49:38,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 18:49:38,489 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-18 18:49:38,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 18:49:38,489 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:38,490 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:38,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 18:49:38,490 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:38,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:38,490 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-18 18:49:38,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:38,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [436435357] [2020-08-18 18:49:38,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:38,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:38,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:38,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:38,632 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 18:49:38,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [436435357] [2020-08-18 18:49:38,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:38,632 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 18:49:38,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265672938] [2020-08-18 18:49:38,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 18:49:38,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:38,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 18:49:38,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-18 18:49:38,634 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-18 18:49:38,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:38,951 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-18 18:49:38,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 18:49:38,952 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-18 18:49:38,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:38,953 INFO L225 Difference]: With dead ends: 57 [2020-08-18 18:49:38,953 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 18:49:38,954 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 18:49:38,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 18:49:38,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 18:49:38,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 18:49:38,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-18 18:49:38,963 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-18 18:49:38,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:38,963 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-18 18:49:38,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 18:49:38,963 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-18 18:49:38,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 18:49:38,964 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:38,964 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:38,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 18:49:38,965 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:38,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:38,965 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-18 18:49:38,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:38,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [425942538] [2020-08-18 18:49:38,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:38,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:39,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:39,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:39,103 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 18:49:39,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [425942538] [2020-08-18 18:49:39,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:39,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 18:49:39,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860516428] [2020-08-18 18:49:39,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 18:49:39,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:39,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 18:49:39,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-18 18:49:39,106 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-18 18:49:39,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:39,511 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-18 18:49:39,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 18:49:39,512 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 18:49:39,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:39,513 INFO L225 Difference]: With dead ends: 58 [2020-08-18 18:49:39,513 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 18:49:39,513 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 18:49:39,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 18:49:39,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 18:49:39,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 18:49:39,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-18 18:49:39,521 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-18 18:49:39,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:39,522 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-18 18:49:39,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 18:49:39,522 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-18 18:49:39,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 18:49:39,523 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:39,523 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:39,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 18:49:39,523 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:39,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:39,524 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-18 18:49:39,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:39,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [108651663] [2020-08-18 18:49:39,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:39,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:39,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:39,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:39,674 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 18:49:39,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [108651663] [2020-08-18 18:49:39,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:39,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 18:49:39,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708138302] [2020-08-18 18:49:39,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 18:49:39,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:39,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 18:49:39,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-18 18:49:39,676 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-18 18:49:40,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:40,103 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-18 18:49:40,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 18:49:40,106 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-18 18:49:40,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:40,107 INFO L225 Difference]: With dead ends: 59 [2020-08-18 18:49:40,107 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 18:49:40,109 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 18:49:40,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 18:49:40,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 18:49:40,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 18:49:40,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-18 18:49:40,122 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-18 18:49:40,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:40,122 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-18 18:49:40,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 18:49:40,123 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-18 18:49:40,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 18:49:40,126 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:40,126 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:40,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 18:49:40,127 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:40,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:40,127 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-18 18:49:40,128 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:40,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877905376] [2020-08-18 18:49:40,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:40,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:40,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:40,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:40,355 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 18:49:40,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877905376] [2020-08-18 18:49:40,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:40,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 18:49:40,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221131246] [2020-08-18 18:49:40,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 18:49:40,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:40,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 18:49:40,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-18 18:49:40,358 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-18 18:49:40,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:40,800 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-18 18:49:40,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 18:49:40,806 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-18 18:49:40,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:40,807 INFO L225 Difference]: With dead ends: 60 [2020-08-18 18:49:40,807 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 18:49:40,808 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 18:49:40,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 18:49:40,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 18:49:40,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 18:49:40,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-18 18:49:40,815 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-18 18:49:40,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:40,815 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-18 18:49:40,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 18:49:40,816 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-18 18:49:40,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 18:49:40,816 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:40,817 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:40,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 18:49:40,817 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:40,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:40,817 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-18 18:49:40,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:40,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [737810960] [2020-08-18 18:49:40,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:40,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:41,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:41,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:41,007 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 18:49:41,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [737810960] [2020-08-18 18:49:41,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:41,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 18:49:41,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335354117] [2020-08-18 18:49:41,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 18:49:41,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:41,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 18:49:41,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-18 18:49:41,010 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-18 18:49:41,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:41,532 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-18 18:49:41,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 18:49:41,533 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-18 18:49:41,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:41,533 INFO L225 Difference]: With dead ends: 61 [2020-08-18 18:49:41,534 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 18:49:41,534 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-18 18:49:41,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 18:49:41,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 18:49:41,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 18:49:41,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-18 18:49:41,548 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-18 18:49:41,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:41,548 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-18 18:49:41,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 18:49:41,549 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-18 18:49:41,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 18:49:41,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:41,549 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:41,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 18:49:41,550 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:41,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:41,550 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-18 18:49:41,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:41,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [477726042] [2020-08-18 18:49:41,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:41,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:41,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:41,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:41,752 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 18:49:41,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [477726042] [2020-08-18 18:49:41,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:41,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 18:49:41,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205992094] [2020-08-18 18:49:41,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 18:49:41,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:41,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 18:49:41,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-18 18:49:41,755 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-18 18:49:42,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:42,343 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-18 18:49:42,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 18:49:42,344 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-18 18:49:42,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:42,345 INFO L225 Difference]: With dead ends: 62 [2020-08-18 18:49:42,345 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 18:49:42,347 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 18:49:42,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 18:49:42,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 18:49:42,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 18:49:42,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-18 18:49:42,355 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-18 18:49:42,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:42,355 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-18 18:49:42,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 18:49:42,356 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-18 18:49:42,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 18:49:42,356 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:42,357 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:42,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 18:49:42,357 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:42,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:42,357 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-18 18:49:42,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:42,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2140747628] [2020-08-18 18:49:42,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:42,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:42,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:42,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:42,593 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 18:49:42,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2140747628] [2020-08-18 18:49:42,594 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:42,594 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 18:49:42,594 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410702409] [2020-08-18 18:49:42,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 18:49:42,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:42,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 18:49:42,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-18 18:49:42,596 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-18 18:49:43,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:43,229 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-18 18:49:43,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 18:49:43,229 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-18 18:49:43,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:43,230 INFO L225 Difference]: With dead ends: 63 [2020-08-18 18:49:43,230 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 18:49:43,231 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 18:49:43,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 18:49:43,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 18:49:43,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 18:49:43,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-18 18:49:43,238 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-18 18:49:43,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:43,238 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-18 18:49:43,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 18:49:43,238 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-18 18:49:43,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 18:49:43,239 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:43,239 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:43,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 18:49:43,240 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:43,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:43,240 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-18 18:49:43,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:43,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [696464780] [2020-08-18 18:49:43,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:43,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:43,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:43,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:43,533 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 18:49:43,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [696464780] [2020-08-18 18:49:43,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:43,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 18:49:43,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565308668] [2020-08-18 18:49:43,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 18:49:43,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:43,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 18:49:43,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-18 18:49:43,535 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-18 18:49:44,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:44,269 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-18 18:49:44,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 18:49:44,271 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-18 18:49:44,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:44,271 INFO L225 Difference]: With dead ends: 64 [2020-08-18 18:49:44,271 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 18:49:44,273 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 18:49:44,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 18:49:44,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 18:49:44,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 18:49:44,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-18 18:49:44,287 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-18 18:49:44,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:44,287 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-18 18:49:44,287 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 18:49:44,287 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-18 18:49:44,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 18:49:44,288 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:44,288 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:44,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 18:49:44,288 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:44,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:44,289 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-18 18:49:44,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:44,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1095934260] [2020-08-18 18:49:44,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:44,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:44,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:44,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:44,588 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 18:49:44,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1095934260] [2020-08-18 18:49:44,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:44,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 18:49:44,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181350027] [2020-08-18 18:49:44,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 18:49:44,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:44,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 18:49:44,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-18 18:49:44,590 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-18 18:49:45,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:45,404 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-18 18:49:45,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 18:49:45,405 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-18 18:49:45,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:45,406 INFO L225 Difference]: With dead ends: 65 [2020-08-18 18:49:45,406 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 18:49:45,407 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 18:49:45,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 18:49:45,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 18:49:45,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 18:49:45,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-18 18:49:45,414 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-18 18:49:45,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:45,414 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-18 18:49:45,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 18:49:45,414 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-18 18:49:45,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 18:49:45,415 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:45,415 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:45,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 18:49:45,415 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:45,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:45,416 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-18 18:49:45,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:45,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1826231142] [2020-08-18 18:49:45,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:45,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:45,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:45,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:45,742 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 18:49:45,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1826231142] [2020-08-18 18:49:45,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:45,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 18:49:45,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561528378] [2020-08-18 18:49:45,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 18:49:45,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:45,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 18:49:45,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-18 18:49:45,744 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-18 18:49:46,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:46,657 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-18 18:49:46,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 18:49:46,657 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-18 18:49:46,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:46,658 INFO L225 Difference]: With dead ends: 66 [2020-08-18 18:49:46,659 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 18:49:46,660 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 18:49:46,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 18:49:46,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 18:49:46,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 18:49:46,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-18 18:49:46,666 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-18 18:49:46,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:46,667 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-18 18:49:46,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 18:49:46,667 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-18 18:49:46,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 18:49:46,667 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:46,668 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:46,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 18:49:46,668 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:46,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:46,668 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-18 18:49:46,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:46,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792863931] [2020-08-18 18:49:46,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:46,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:47,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:47,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:47,025 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 18:49:47,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792863931] [2020-08-18 18:49:47,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:47,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 18:49:47,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819932011] [2020-08-18 18:49:47,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 18:49:47,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:47,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 18:49:47,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-18 18:49:47,027 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-18 18:49:48,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:48,060 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-18 18:49:48,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 18:49:48,060 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-18 18:49:48,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:48,061 INFO L225 Difference]: With dead ends: 67 [2020-08-18 18:49:48,061 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 18:49:48,062 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 18:49:48,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 18:49:48,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 18:49:48,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 18:49:48,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-18 18:49:48,069 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-18 18:49:48,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:48,069 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-18 18:49:48,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 18:49:48,069 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-18 18:49:48,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 18:49:48,070 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:48,070 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:48,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 18:49:48,071 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:48,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:48,071 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-18 18:49:48,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:48,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1291061646] [2020-08-18 18:49:48,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:48,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:48,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:48,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:48,454 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 18:49:48,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1291061646] [2020-08-18 18:49:48,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:48,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 18:49:48,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395181532] [2020-08-18 18:49:48,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 18:49:48,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:48,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 18:49:48,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-18 18:49:48,456 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-18 18:49:49,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:49,583 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-18 18:49:49,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 18:49:49,584 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-18 18:49:49,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:49,585 INFO L225 Difference]: With dead ends: 68 [2020-08-18 18:49:49,585 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 18:49:49,587 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 18:49:49,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 18:49:49,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 18:49:49,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 18:49:49,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-18 18:49:49,594 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-18 18:49:49,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:49,594 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-18 18:49:49,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 18:49:49,595 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-18 18:49:49,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 18:49:49,595 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:49,595 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:49,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 18:49:49,596 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:49,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:49,596 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-18 18:49:49,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:49,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [657735338] [2020-08-18 18:49:49,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:49,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:50,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:50,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:50,035 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 18:49:50,036 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [657735338] [2020-08-18 18:49:50,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:50,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 18:49:50,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078413206] [2020-08-18 18:49:50,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 18:49:50,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:50,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 18:49:50,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-18 18:49:50,037 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-18 18:49:51,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:51,256 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-18 18:49:51,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 18:49:51,258 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-18 18:49:51,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:51,258 INFO L225 Difference]: With dead ends: 69 [2020-08-18 18:49:51,258 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 18:49:51,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 18:49:51,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 18:49:51,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 18:49:51,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 18:49:51,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-18 18:49:51,265 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-18 18:49:51,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:51,266 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-18 18:49:51,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 18:49:51,266 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-18 18:49:51,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 18:49:51,266 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:51,266 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:51,267 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 18:49:51,267 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:51,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:51,267 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-18 18:49:51,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:51,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1303065501] [2020-08-18 18:49:51,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:51,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:51,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:51,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:51,323 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 18:49:51,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1303065501] [2020-08-18 18:49:51,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:49:51,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 18:49:51,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463837245] [2020-08-18 18:49:51,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 18:49:51,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:51,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 18:49:51,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 18:49:51,324 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-18 18:49:51,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:51,345 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-18 18:49:51,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:49:51,345 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-18 18:49:51,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:51,345 INFO L225 Difference]: With dead ends: 66 [2020-08-18 18:49:51,346 INFO L226 Difference]: Without dead ends: 0 [2020-08-18 18:49:51,346 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 18:49:51,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-18 18:49:51,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-18 18:49:51,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-18 18:49:51,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-18 18:49:51,347 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-18 18:49:51,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:51,347 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-18 18:49:51,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 18:49:51,347 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-18 18:49:51,347 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-18 18:49:51,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 18:49:51,350 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-18 18:49:51,547 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 12 [2020-08-18 18:49:51,553 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-18 18:49:51,553 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-18 18:49:51,553 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-18 18:49:51,553 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-18 18:49:51,553 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-18 18:49:51,553 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-18 18:49:51,553 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-18 18:49:51,554 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-18 18:49:51,554 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-18 18:49:51,554 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-18 18:49:51,554 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-18 18:49:51,554 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-18 18:49:51,554 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-18 18:49:51,554 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-18 18:49:51,555 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-18 18:49:51,555 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 18:49:51,555 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 18:49:51,555 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-18 18:49:51,555 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-18 18:49:51,555 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-18 18:49:51,555 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-18 18:49:51,556 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-18 18:49:51,556 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-18 18:49:51,556 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-18 18:49:51,556 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-18 18:49:51,581 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 06:49:51 BoogieIcfgContainer [2020-08-18 18:49:51,581 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 18:49:51,584 INFO L168 Benchmark]: Toolchain (without parser) took 16693.19 ms. Allocated memory was 140.5 MB in the beginning and 351.3 MB in the end (delta: 210.8 MB). Free memory was 103.5 MB in the beginning and 253.7 MB in the end (delta: -150.2 MB). Peak memory consumption was 60.5 MB. Max. memory is 7.1 GB. [2020-08-18 18:49:51,585 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-18 18:49:51,585 INFO L168 Benchmark]: CACSL2BoogieTranslator took 231.42 ms. Allocated memory is still 140.5 MB. Free memory was 103.3 MB in the beginning and 93.9 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-08-18 18:49:51,590 INFO L168 Benchmark]: Boogie Preprocessor took 113.49 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 93.9 MB in the beginning and 182.1 MB in the end (delta: -88.2 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-18 18:49:51,591 INFO L168 Benchmark]: RCFGBuilder took 269.50 ms. Allocated memory is still 203.9 MB. Free memory was 182.1 MB in the beginning and 170.2 MB in the end (delta: 11.9 MB). Peak memory consumption was 11.9 MB. Max. memory is 7.1 GB. [2020-08-18 18:49:51,595 INFO L168 Benchmark]: TraceAbstraction took 16073.58 ms. Allocated memory was 203.9 MB in the beginning and 351.3 MB in the end (delta: 147.3 MB). Free memory was 169.6 MB in the beginning and 253.7 MB in the end (delta: -84.2 MB). Peak memory consumption was 63.2 MB. Max. memory is 7.1 GB. [2020-08-18 18:49:51,598 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 231.42 ms. Allocated memory is still 140.5 MB. Free memory was 103.3 MB in the beginning and 93.9 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 113.49 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 93.9 MB in the beginning and 182.1 MB in the end (delta: -88.2 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 269.50 ms. Allocated memory is still 203.9 MB. Free memory was 182.1 MB in the beginning and 170.2 MB in the end (delta: 11.9 MB). Peak memory consumption was 11.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 16073.58 ms. Allocated memory was 203.9 MB in the beginning and 351.3 MB in the end (delta: 147.3 MB). Free memory was 169.6 MB in the beginning and 253.7 MB in the end (delta: -84.2 MB). Peak memory consumption was 63.2 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: 15.7s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.7s, 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, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 12.1s 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, 4.0s 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...