/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 23:39:19,604 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 23:39:19,607 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 23:39:19,649 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 23:39:19,649 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 23:39:19,662 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 23:39:19,663 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 23:39:19,666 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 23:39:19,668 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 23:39:19,670 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 23:39:19,671 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 23:39:19,673 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 23:39:19,673 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 23:39:19,676 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 23:39:19,677 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 23:39:19,678 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 23:39:19,679 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 23:39:19,679 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 23:39:19,681 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 23:39:19,682 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 23:39:19,684 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 23:39:19,685 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 23:39:19,686 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 23:39:19,687 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 23:39:19,689 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 23:39:19,696 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 23:39:19,697 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 23:39:19,697 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 23:39:19,698 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 23:39:19,720 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 23:39:19,721 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 23:39:19,722 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 23:39:19,722 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 23:39:19,722 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 23:39:19,722 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 23:39:19,723 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 23:39:19,723 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 23:39:19,723 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 23:39:19,723 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 23:39:19,723 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 23:39:19,724 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 23:39:19,724 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 23:39:19,724 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 23:39:19,724 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 23:39:19,724 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 23:39:19,725 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 23:39:19,725 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 23:39:19,725 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 23:39:19,725 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 23:39:19,725 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 23:39:19,726 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 23:39:19,726 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 23:39:19,726 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 23:39:19,726 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 23:39:19,726 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 23:39:19,727 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 23:39:19,727 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 23:39:19,727 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 23:39:19,727 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=WIDESTAMONGSMALL;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2; [2020-08-18 23:39:20,002 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 23:39:20,021 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 23:39:20,027 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 23:39:20,032 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 23:39:20,033 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 23:39:20,034 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-18 23:39:20,110 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/da81348f2/2f1ad0f88a3345bfafb6966be91a26dd/FLAGd136e0537 [2020-08-18 23:39:20,589 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 23:39:20,590 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-18 23:39:20,596 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/da81348f2/2f1ad0f88a3345bfafb6966be91a26dd/FLAGd136e0537 [2020-08-18 23:39:20,970 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/da81348f2/2f1ad0f88a3345bfafb6966be91a26dd [2020-08-18 23:39:20,980 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 23:39:20,982 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 23:39:20,984 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 23:39:20,984 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 23:39:20,988 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 23:39:20,989 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:39:20" (1/1) ... [2020-08-18 23:39:20,992 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@632ac694 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:20, skipping insertion in model container [2020-08-18 23:39:20,993 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:39:20" (1/1) ... [2020-08-18 23:39:21,000 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 23:39:21,022 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 23:39:21,188 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 23:39:21,193 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 23:39:21,208 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 23:39:21,222 INFO L208 MainTranslator]: Completed translation [2020-08-18 23:39:21,223 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:21 WrapperNode [2020-08-18 23:39:21,223 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 23:39:21,224 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 23:39:21,224 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 23:39:21,224 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 23:39:21,238 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:21" (1/1) ... [2020-08-18 23:39:21,239 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:21" (1/1) ... [2020-08-18 23:39:21,319 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:21" (1/1) ... [2020-08-18 23:39:21,320 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:21" (1/1) ... [2020-08-18 23:39:21,323 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:21" (1/1) ... [2020-08-18 23:39:21,328 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:21" (1/1) ... [2020-08-18 23:39:21,329 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:21" (1/1) ... [2020-08-18 23:39:21,330 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 23:39:21,330 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 23:39:21,331 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 23:39:21,331 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 23:39:21,332 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:21" (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 23:39:21,396 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 23:39:21,397 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 23:39:21,397 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 23:39:21,397 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 23:39:21,397 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 23:39:21,397 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 23:39:21,398 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 23:39:21,398 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 23:39:21,398 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 23:39:21,559 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 23:39:21,559 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 23:39:21,563 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:39:21 BoogieIcfgContainer [2020-08-18 23:39:21,563 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 23:39:21,564 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 23:39:21,564 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 23:39:21,568 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 23:39:21,568 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 11:39:20" (1/3) ... [2020-08-18 23:39:21,569 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cf97a3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:39:21, skipping insertion in model container [2020-08-18 23:39:21,569 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:21" (2/3) ... [2020-08-18 23:39:21,570 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cf97a3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:39:21, skipping insertion in model container [2020-08-18 23:39:21,570 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:39:21" (3/3) ... [2020-08-18 23:39:21,572 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-18 23:39:21,582 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 23:39:21,592 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 23:39:21,606 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 23:39:21,638 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 23:39:21,638 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 23:39:21,638 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 23:39:21,639 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 23:39:21,639 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 23:39:21,639 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 23:39:21,640 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 23:39:21,640 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 23:39:21,664 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 23:39:21,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 23:39:21,673 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:21,674 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:21,675 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:21,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:21,683 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 23:39:21,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:21,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1289821029] [2020-08-18 23:39:21,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:21,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:21,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:21,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:21,936 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 23:39:21,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1289821029] [2020-08-18 23:39:21,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:39:21,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 23:39:21,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702942964] [2020-08-18 23:39:21,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 23:39:21,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:21,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 23:39:21,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 23:39:21,966 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 23:39:22,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:22,009 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 23:39:22,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 23:39:22,011 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 23:39:22,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:22,022 INFO L225 Difference]: With dead ends: 29 [2020-08-18 23:39:22,023 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 23:39:22,027 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 23:39:22,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 23:39:22,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 23:39:22,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 23:39:22,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 23:39:22,073 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 23:39:22,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:22,074 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 23:39:22,074 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 23:39:22,074 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 23:39:22,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 23:39:22,075 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:22,075 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:22,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 23:39:22,076 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:22,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:22,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 23:39:22,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:22,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [436673755] [2020-08-18 23:39:22,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:22,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:22,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:22,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:22,213 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:22,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [436673755] [2020-08-18 23:39:22,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:22,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 23:39:22,215 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829568395] [2020-08-18 23:39:22,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 23:39:22,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:22,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 23:39:22,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 23:39:22,218 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 23:39:22,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:22,240 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 23:39:22,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 23:39:22,241 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 23:39:22,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:22,241 INFO L225 Difference]: With dead ends: 18 [2020-08-18 23:39:22,242 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 23:39:22,243 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 23:39:22,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 23:39:22,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 23:39:22,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 23:39:22,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 23:39:22,248 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 23:39:22,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:22,249 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 23:39:22,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 23:39:22,249 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 23:39:22,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 23:39:22,250 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:22,250 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:22,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 23:39:22,251 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:22,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:22,251 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 23:39:22,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:22,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1302320820] [2020-08-18 23:39:22,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:22,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:22,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:22,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:22,363 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:22,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1302320820] [2020-08-18 23:39:22,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:22,364 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 23:39:22,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443245998] [2020-08-18 23:39:22,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 23:39:22,365 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:22,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 23:39:22,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 23:39:22,366 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 23:39:22,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:22,386 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 23:39:22,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 23:39:22,386 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 23:39:22,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:22,387 INFO L225 Difference]: With dead ends: 19 [2020-08-18 23:39:22,387 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 23:39:22,388 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 23:39:22,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 23:39:22,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 23:39:22,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 23:39:22,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 23:39:22,394 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 23:39:22,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:22,395 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 23:39:22,395 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 23:39:22,395 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 23:39:22,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 23:39:22,396 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:22,396 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:22,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 23:39:22,396 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:22,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:22,397 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 23:39:22,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:22,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1978180277] [2020-08-18 23:39:22,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:22,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:22,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:22,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:22,515 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:22,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1978180277] [2020-08-18 23:39:22,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:22,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 23:39:22,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535045935] [2020-08-18 23:39:22,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 23:39:22,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:22,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 23:39:22,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 23:39:22,518 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 23:39:22,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:22,547 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 23:39:22,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 23:39:22,547 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 23:39:22,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:22,548 INFO L225 Difference]: With dead ends: 20 [2020-08-18 23:39:22,548 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 23:39:22,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 23:39:22,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 23:39:22,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 23:39:22,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 23:39:22,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 23:39:22,554 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 23:39:22,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:22,555 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 23:39:22,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 23:39:22,555 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 23:39:22,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 23:39:22,555 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:22,556 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:22,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 23:39:22,556 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:22,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:22,557 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 23:39:22,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:22,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [431214865] [2020-08-18 23:39:22,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:22,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:22,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:22,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:22,664 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:22,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [431214865] [2020-08-18 23:39:22,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:22,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 23:39:22,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167952708] [2020-08-18 23:39:22,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 23:39:22,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:22,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 23:39:22,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 23:39:22,667 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 23:39:22,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:22,702 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 23:39:22,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 23:39:22,703 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 23:39:22,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:22,704 INFO L225 Difference]: With dead ends: 21 [2020-08-18 23:39:22,704 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 23:39:22,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 23:39:22,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 23:39:22,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 23:39:22,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 23:39:22,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 23:39:22,711 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 23:39:22,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:22,711 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 23:39:22,711 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 23:39:22,711 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 23:39:22,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 23:39:22,712 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:22,712 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:22,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 23:39:22,713 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:22,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:22,713 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 23:39:22,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:22,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1049446508] [2020-08-18 23:39:22,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:22,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:22,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:22,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:22,865 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:22,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1049446508] [2020-08-18 23:39:22,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:22,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 23:39:22,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464024921] [2020-08-18 23:39:22,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 23:39:22,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:22,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 23:39:22,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 23:39:22,868 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-18 23:39:22,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:22,911 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 23:39:22,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 23:39:22,912 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-18 23:39:22,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:22,913 INFO L225 Difference]: With dead ends: 22 [2020-08-18 23:39:22,913 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 23:39:22,913 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 23:39:22,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 23:39:22,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 23:39:22,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 23:39:22,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 23:39:22,919 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 23:39:22,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:22,919 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 23:39:22,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 23:39:22,920 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 23:39:22,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 23:39:22,920 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:22,920 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:22,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 23:39:22,921 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:22,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:22,921 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 23:39:22,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:22,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762096375] [2020-08-18 23:39:22,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:22,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:23,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:23,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:23,075 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:23,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762096375] [2020-08-18 23:39:23,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:23,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 23:39:23,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307305367] [2020-08-18 23:39:23,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 23:39:23,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:23,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 23:39:23,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 23:39:23,078 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-18 23:39:23,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:23,130 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-18 23:39:23,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 23:39:23,131 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-18 23:39:23,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:23,131 INFO L225 Difference]: With dead ends: 23 [2020-08-18 23:39:23,132 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 23:39:23,132 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 23:39:23,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 23:39:23,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 23:39:23,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 23:39:23,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-18 23:39:23,137 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-18 23:39:23,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:23,138 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-18 23:39:23,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 23:39:23,138 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-18 23:39:23,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 23:39:23,139 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:23,139 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:23,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 23:39:23,139 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:23,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:23,140 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-18 23:39:23,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:23,141 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1402502483] [2020-08-18 23:39:23,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:23,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:23,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:23,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:23,288 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:23,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1402502483] [2020-08-18 23:39:23,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:23,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 23:39:23,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737529395] [2020-08-18 23:39:23,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 23:39:23,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:23,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 23:39:23,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 23:39:23,290 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-18 23:39:23,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:23,346 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 23:39:23,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 23:39:23,346 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-18 23:39:23,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:23,347 INFO L225 Difference]: With dead ends: 24 [2020-08-18 23:39:23,347 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 23:39:23,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 23:39:23,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 23:39:23,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 23:39:23,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 23:39:23,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 23:39:23,353 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-18 23:39:23,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:23,354 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 23:39:23,354 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 23:39:23,354 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 23:39:23,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 23:39:23,354 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:23,355 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:23,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 23:39:23,355 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:23,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:23,355 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-18 23:39:23,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:23,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [293428812] [2020-08-18 23:39:23,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:23,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:23,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:23,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:23,547 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:23,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [293428812] [2020-08-18 23:39:23,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:23,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 23:39:23,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271543188] [2020-08-18 23:39:23,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 23:39:23,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:23,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 23:39:23,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 23:39:23,552 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-18 23:39:23,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:23,639 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-18 23:39:23,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 23:39:23,640 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-18 23:39:23,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:23,641 INFO L225 Difference]: With dead ends: 25 [2020-08-18 23:39:23,641 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 23:39:23,642 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 23:39:23,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 23:39:23,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 23:39:23,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 23:39:23,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 23:39:23,651 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-18 23:39:23,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:23,652 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 23:39:23,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 23:39:23,655 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 23:39:23,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 23:39:23,655 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:23,656 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:23,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 23:39:23,656 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:23,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:23,658 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-18 23:39:23,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:23,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1758908692] [2020-08-18 23:39:23,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:23,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:23,905 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:23,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:23,912 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:23,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1758908692] [2020-08-18 23:39:23,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:23,913 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 23:39:23,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001454478] [2020-08-18 23:39:23,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 23:39:23,914 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:23,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 23:39:23,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 23:39:23,916 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-18 23:39:24,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:24,019 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 23:39:24,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 23:39:24,020 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-18 23:39:24,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:24,021 INFO L225 Difference]: With dead ends: 26 [2020-08-18 23:39:24,021 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 23:39:24,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 23:39:24,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 23:39:24,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 23:39:24,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 23:39:24,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 23:39:24,032 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-18 23:39:24,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:24,033 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 23:39:24,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 23:39:24,033 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 23:39:24,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 23:39:24,034 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:24,035 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:24,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 23:39:24,035 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:24,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:24,035 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-18 23:39:24,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:24,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1824946301] [2020-08-18 23:39:24,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:24,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:24,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:24,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:24,252 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:24,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1824946301] [2020-08-18 23:39:24,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:24,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 23:39:24,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675440114] [2020-08-18 23:39:24,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 23:39:24,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:24,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 23:39:24,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 23:39:24,256 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-18 23:39:24,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:24,372 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-18 23:39:24,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 23:39:24,374 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-18 23:39:24,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:24,375 INFO L225 Difference]: With dead ends: 27 [2020-08-18 23:39:24,377 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 23:39:24,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 23:39:24,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 23:39:24,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 23:39:24,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 23:39:24,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-18 23:39:24,385 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-18 23:39:24,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:24,385 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-18 23:39:24,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 23:39:24,390 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-18 23:39:24,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 23:39:24,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:24,391 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:24,391 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 23:39:24,392 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:24,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:24,393 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-18 23:39:24,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:24,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849095445] [2020-08-18 23:39:24,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:24,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:24,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:24,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:24,615 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:24,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849095445] [2020-08-18 23:39:24,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:24,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 23:39:24,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334098833] [2020-08-18 23:39:24,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 23:39:24,618 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:24,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 23:39:24,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 23:39:24,618 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-18 23:39:24,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:24,717 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 23:39:24,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 23:39:24,718 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-18 23:39:24,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:24,720 INFO L225 Difference]: With dead ends: 28 [2020-08-18 23:39:24,720 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 23:39:24,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 23:39:24,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 23:39:24,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 23:39:24,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 23:39:24,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 23:39:24,726 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-18 23:39:24,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:24,726 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 23:39:24,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 23:39:24,727 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 23:39:24,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 23:39:24,729 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:24,729 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:24,729 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 23:39:24,729 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:24,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:24,730 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-18 23:39:24,730 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:24,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638928721] [2020-08-18 23:39:24,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:24,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:24,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:24,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:24,998 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:24,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638928721] [2020-08-18 23:39:24,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:24,999 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 23:39:24,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387446672] [2020-08-18 23:39:25,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 23:39:25,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:25,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 23:39:25,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 23:39:25,001 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-18 23:39:25,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:25,112 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 23:39:25,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 23:39:25,113 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-18 23:39:25,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:25,114 INFO L225 Difference]: With dead ends: 29 [2020-08-18 23:39:25,114 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 23:39:25,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 23:39:25,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 23:39:25,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 23:39:25,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 23:39:25,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-18 23:39:25,123 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-18 23:39:25,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:25,123 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-18 23:39:25,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 23:39:25,123 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-18 23:39:25,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 23:39:25,124 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:25,124 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:25,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 23:39:25,124 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:25,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:25,125 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-18 23:39:25,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:25,129 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1201923264] [2020-08-18 23:39:25,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:25,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:25,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:25,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:25,399 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:25,399 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1201923264] [2020-08-18 23:39:25,399 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:25,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 23:39:25,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958129067] [2020-08-18 23:39:25,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 23:39:25,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:25,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 23:39:25,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 23:39:25,403 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-18 23:39:25,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:25,560 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 23:39:25,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 23:39:25,560 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-18 23:39:25,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:25,561 INFO L225 Difference]: With dead ends: 30 [2020-08-18 23:39:25,561 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 23:39:25,562 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 23:39:25,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 23:39:25,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 23:39:25,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 23:39:25,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 23:39:25,566 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-18 23:39:25,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:25,566 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 23:39:25,567 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 23:39:25,567 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 23:39:25,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 23:39:25,567 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:25,568 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:25,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 23:39:25,568 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:25,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:25,568 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-18 23:39:25,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:25,569 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1720913966] [2020-08-18 23:39:25,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:25,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:25,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:25,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:25,821 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:25,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1720913966] [2020-08-18 23:39:25,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:25,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 23:39:25,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766316131] [2020-08-18 23:39:25,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 23:39:25,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:25,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 23:39:25,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 23:39:25,823 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-18 23:39:25,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:25,970 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-18 23:39:25,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 23:39:25,976 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-18 23:39:25,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:25,977 INFO L225 Difference]: With dead ends: 31 [2020-08-18 23:39:25,977 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 23:39:25,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 23:39:25,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 23:39:25,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 23:39:25,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 23:39:25,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 23:39:25,982 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-18 23:39:25,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:25,982 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 23:39:25,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 23:39:25,982 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 23:39:25,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 23:39:25,983 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:25,983 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:25,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 23:39:25,984 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:25,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:25,984 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-18 23:39:25,984 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:25,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933260487] [2020-08-18 23:39:25,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:25,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:26,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,246 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:26,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933260487] [2020-08-18 23:39:26,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:26,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 23:39:26,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800506115] [2020-08-18 23:39:26,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 23:39:26,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:26,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 23:39:26,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 23:39:26,248 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-18 23:39:26,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:26,419 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 23:39:26,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 23:39:26,419 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-18 23:39:26,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:26,421 INFO L225 Difference]: With dead ends: 32 [2020-08-18 23:39:26,421 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 23:39:26,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 23:39:26,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 23:39:26,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 23:39:26,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 23:39:26,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 23:39:26,426 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-18 23:39:26,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:26,427 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 23:39:26,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 23:39:26,427 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 23:39:26,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 23:39:26,427 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:26,427 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:26,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 23:39:26,428 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:26,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:26,428 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-18 23:39:26,428 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:26,429 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [674292909] [2020-08-18 23:39:26,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:26,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:26,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,722 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:26,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [674292909] [2020-08-18 23:39:26,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:26,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 23:39:26,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634727266] [2020-08-18 23:39:26,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 23:39:26,723 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:26,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 23:39:26,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 23:39:26,724 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-18 23:39:26,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:26,937 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-18 23:39:26,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 23:39:26,937 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-18 23:39:26,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:26,938 INFO L225 Difference]: With dead ends: 33 [2020-08-18 23:39:26,938 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 23:39:26,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 23:39:26,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 23:39:26,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 23:39:26,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 23:39:26,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-18 23:39:26,943 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-18 23:39:26,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:26,943 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-18 23:39:26,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 23:39:26,943 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-18 23:39:26,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 23:39:26,944 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:26,944 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:26,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 23:39:26,944 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:26,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:26,945 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-18 23:39:26,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:26,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1684449333] [2020-08-18 23:39:26,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:26,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:27,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:27,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:27,248 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:27,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1684449333] [2020-08-18 23:39:27,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:27,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 23:39:27,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190054359] [2020-08-18 23:39:27,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 23:39:27,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:27,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 23:39:27,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 23:39:27,251 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-18 23:39:27,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:27,493 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 23:39:27,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 23:39:27,493 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-18 23:39:27,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:27,494 INFO L225 Difference]: With dead ends: 34 [2020-08-18 23:39:27,494 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 23:39:27,495 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 23:39:27,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 23:39:27,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 23:39:27,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 23:39:27,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 23:39:27,503 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-18 23:39:27,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:27,503 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 23:39:27,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 23:39:27,503 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 23:39:27,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 23:39:27,504 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:27,504 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:27,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 23:39:27,504 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:27,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:27,504 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-18 23:39:27,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:27,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [709627199] [2020-08-18 23:39:27,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:27,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:27,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:27,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:27,883 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:27,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [709627199] [2020-08-18 23:39:27,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:27,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 23:39:27,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531489294] [2020-08-18 23:39:27,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 23:39:27,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:27,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 23:39:27,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 23:39:27,885 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-18 23:39:28,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:28,121 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 23:39:28,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 23:39:28,122 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-18 23:39:28,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:28,123 INFO L225 Difference]: With dead ends: 35 [2020-08-18 23:39:28,123 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 23:39:28,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 23:39:28,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 23:39:28,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 23:39:28,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 23:39:28,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-18 23:39:28,128 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-18 23:39:28,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:28,128 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-18 23:39:28,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 23:39:28,128 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-18 23:39:28,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 23:39:28,129 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:28,129 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:28,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 23:39:28,130 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:28,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:28,130 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-18 23:39:28,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:28,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1694326807] [2020-08-18 23:39:28,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:28,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:28,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:28,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:28,510 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:28,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1694326807] [2020-08-18 23:39:28,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:28,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 23:39:28,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616519395] [2020-08-18 23:39:28,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 23:39:28,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:28,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 23:39:28,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 23:39:28,513 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-18 23:39:28,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:28,787 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 23:39:28,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 23:39:28,788 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-18 23:39:28,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:28,789 INFO L225 Difference]: With dead ends: 36 [2020-08-18 23:39:28,789 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 23:39:28,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 23:39:28,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 23:39:28,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 23:39:28,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 23:39:28,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 23:39:28,797 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-18 23:39:28,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:28,797 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 23:39:28,797 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 23:39:28,798 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 23:39:28,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 23:39:28,798 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:28,798 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:28,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 23:39:28,799 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:28,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:28,799 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-18 23:39:28,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:28,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [128109673] [2020-08-18 23:39:28,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:28,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:29,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:29,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:29,235 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:29,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [128109673] [2020-08-18 23:39:29,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:29,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 23:39:29,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7974004] [2020-08-18 23:39:29,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 23:39:29,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:29,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 23:39:29,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 23:39:29,237 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-18 23:39:29,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:29,517 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-18 23:39:29,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 23:39:29,517 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-18 23:39:29,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:29,518 INFO L225 Difference]: With dead ends: 37 [2020-08-18 23:39:29,518 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 23:39:29,519 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 23:39:29,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 23:39:29,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 23:39:29,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 23:39:29,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 23:39:29,523 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-18 23:39:29,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:29,523 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 23:39:29,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 23:39:29,524 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 23:39:29,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 23:39:29,524 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:29,524 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:29,525 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 23:39:29,525 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:29,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:29,525 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-18 23:39:29,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:29,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [405290580] [2020-08-18 23:39:29,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:29,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:29,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:29,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:29,989 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:29,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [405290580] [2020-08-18 23:39:29,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:29,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 23:39:29,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223369141] [2020-08-18 23:39:29,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 23:39:29,990 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:29,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 23:39:29,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 23:39:29,991 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-18 23:39:30,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:30,319 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 23:39:30,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 23:39:30,321 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-18 23:39:30,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:30,321 INFO L225 Difference]: With dead ends: 38 [2020-08-18 23:39:30,322 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 23:39:30,322 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 23:39:30,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 23:39:30,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 23:39:30,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 23:39:30,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 23:39:30,328 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-18 23:39:30,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:30,328 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 23:39:30,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 23:39:30,328 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 23:39:30,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 23:39:30,329 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:30,329 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:30,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 23:39:30,329 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:30,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:30,330 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-18 23:39:30,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:30,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2103923508] [2020-08-18 23:39:30,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:30,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:30,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:30,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:30,791 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:30,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2103923508] [2020-08-18 23:39:30,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:30,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 23:39:30,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889136485] [2020-08-18 23:39:30,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 23:39:30,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:30,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 23:39:30,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 23:39:30,794 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-18 23:39:31,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:31,163 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-18 23:39:31,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 23:39:31,163 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-18 23:39:31,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:31,164 INFO L225 Difference]: With dead ends: 39 [2020-08-18 23:39:31,164 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 23:39:31,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 23:39:31,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 23:39:31,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 23:39:31,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 23:39:31,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-18 23:39:31,170 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-18 23:39:31,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:31,170 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-18 23:39:31,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 23:39:31,170 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-18 23:39:31,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 23:39:31,171 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:31,171 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:31,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 23:39:31,171 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:31,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:31,172 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-18 23:39:31,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:31,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1096481007] [2020-08-18 23:39:31,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:31,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:31,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:31,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:31,682 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:31,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1096481007] [2020-08-18 23:39:31,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:31,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 23:39:31,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246725625] [2020-08-18 23:39:31,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 23:39:31,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:31,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 23:39:31,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 23:39:31,685 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-18 23:39:32,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:32,100 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 23:39:32,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 23:39:32,101 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-18 23:39:32,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:32,101 INFO L225 Difference]: With dead ends: 40 [2020-08-18 23:39:32,102 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 23:39:32,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 23:39:32,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 23:39:32,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 23:39:32,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 23:39:32,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 23:39:32,106 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-18 23:39:32,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:32,107 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 23:39:32,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 23:39:32,107 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 23:39:32,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 23:39:32,108 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:32,108 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:32,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 23:39:32,108 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:32,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:32,109 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-18 23:39:32,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:32,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1895188388] [2020-08-18 23:39:32,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:32,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:32,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:32,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:32,663 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:32,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1895188388] [2020-08-18 23:39:32,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:32,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 23:39:32,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161364674] [2020-08-18 23:39:32,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 23:39:32,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:32,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 23:39:32,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 23:39:32,665 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-18 23:39:33,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:33,048 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 23:39:33,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 23:39:33,049 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-18 23:39:33,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:33,050 INFO L225 Difference]: With dead ends: 41 [2020-08-18 23:39:33,050 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 23:39:33,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 23:39:33,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 23:39:33,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 23:39:33,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 23:39:33,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-18 23:39:33,055 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-18 23:39:33,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:33,056 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-18 23:39:33,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 23:39:33,056 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-18 23:39:33,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 23:39:33,057 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:33,057 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:33,057 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 23:39:33,057 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:33,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:33,058 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-18 23:39:33,058 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:33,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182739910] [2020-08-18 23:39:33,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:33,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:33,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:33,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:33,608 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:33,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182739910] [2020-08-18 23:39:33,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:33,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 23:39:33,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595789066] [2020-08-18 23:39:33,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 23:39:33,610 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:33,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 23:39:33,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 23:39:33,610 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-18 23:39:34,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:34,075 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 23:39:34,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 23:39:34,077 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-18 23:39:34,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:34,078 INFO L225 Difference]: With dead ends: 42 [2020-08-18 23:39:34,078 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 23:39:34,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 23:39:34,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 23:39:34,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 23:39:34,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 23:39:34,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 23:39:34,092 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-18 23:39:34,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:34,092 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 23:39:34,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 23:39:34,093 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 23:39:34,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 23:39:34,097 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:34,097 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:34,097 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 23:39:34,097 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:34,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:34,098 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-18 23:39:34,098 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:34,098 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1984442773] [2020-08-18 23:39:34,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:34,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:34,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:34,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:34,765 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:34,765 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1984442773] [2020-08-18 23:39:34,765 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:34,765 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 23:39:34,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452624680] [2020-08-18 23:39:34,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 23:39:34,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:34,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 23:39:34,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 23:39:34,767 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-18 23:39:35,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:35,244 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-18 23:39:35,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 23:39:35,244 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-18 23:39:35,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:35,245 INFO L225 Difference]: With dead ends: 43 [2020-08-18 23:39:35,245 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 23:39:35,246 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 23:39:35,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 23:39:35,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 23:39:35,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 23:39:35,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 23:39:35,258 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-18 23:39:35,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:35,260 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 23:39:35,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 23:39:35,260 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 23:39:35,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 23:39:35,261 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:35,261 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:35,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 23:39:35,261 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:35,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:35,262 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-18 23:39:35,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:35,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [95093236] [2020-08-18 23:39:35,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:35,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:36,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:36,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:36,063 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:36,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [95093236] [2020-08-18 23:39:36,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:36,065 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 23:39:36,065 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972057729] [2020-08-18 23:39:36,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 23:39:36,066 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:36,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 23:39:36,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 23:39:36,067 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-18 23:39:36,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:36,588 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 23:39:36,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 23:39:36,589 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-18 23:39:36,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:36,589 INFO L225 Difference]: With dead ends: 44 [2020-08-18 23:39:36,589 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 23:39:36,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 23:39:36,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 23:39:36,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 23:39:36,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 23:39:36,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 23:39:36,595 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-18 23:39:36,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:36,595 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 23:39:36,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 23:39:36,596 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 23:39:36,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 23:39:36,597 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:36,597 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:36,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 23:39:36,597 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:36,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:36,598 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-18 23:39:36,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:36,598 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [684328093] [2020-08-18 23:39:36,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:36,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:37,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:37,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:37,320 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:37,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [684328093] [2020-08-18 23:39:37,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:37,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 23:39:37,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251827665] [2020-08-18 23:39:37,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 23:39:37,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:37,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 23:39:37,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 23:39:37,321 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-18 23:39:37,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:37,879 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-18 23:39:37,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 23:39:37,880 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-18 23:39:37,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:37,880 INFO L225 Difference]: With dead ends: 45 [2020-08-18 23:39:37,881 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 23:39:37,882 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 23:39:37,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 23:39:37,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 23:39:37,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 23:39:37,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-18 23:39:37,887 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-18 23:39:37,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:37,887 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-18 23:39:37,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 23:39:37,887 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-18 23:39:37,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 23:39:37,888 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:37,888 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:37,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 23:39:37,888 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:37,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:37,889 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-18 23:39:37,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:37,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [680403663] [2020-08-18 23:39:37,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:37,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:38,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:38,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:38,624 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:38,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [680403663] [2020-08-18 23:39:38,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:38,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 23:39:38,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451595680] [2020-08-18 23:39:38,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 23:39:38,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:38,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 23:39:38,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 23:39:38,626 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-18 23:39:39,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:39,220 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 23:39:39,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 23:39:39,221 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-18 23:39:39,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:39,221 INFO L225 Difference]: With dead ends: 46 [2020-08-18 23:39:39,222 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 23:39:39,223 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 23:39:39,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 23:39:39,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 23:39:39,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 23:39:39,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 23:39:39,227 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-18 23:39:39,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:39,228 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 23:39:39,228 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 23:39:39,228 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 23:39:39,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 23:39:39,229 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:39,229 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:39,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 23:39:39,229 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:39,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:39,229 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-18 23:39:39,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:39,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [699453726] [2020-08-18 23:39:39,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:39,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:40,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:40,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:40,014 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:40,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [699453726] [2020-08-18 23:39:40,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:40,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 23:39:40,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310227011] [2020-08-18 23:39:40,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 23:39:40,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:40,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 23:39:40,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 23:39:40,016 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-18 23:39:40,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:40,644 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 23:39:40,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 23:39:40,646 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-18 23:39:40,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:40,647 INFO L225 Difference]: With dead ends: 47 [2020-08-18 23:39:40,647 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 23:39:40,648 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 23:39:40,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 23:39:40,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 23:39:40,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 23:39:40,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-18 23:39:40,652 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-18 23:39:40,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:40,653 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-18 23:39:40,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 23:39:40,653 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-18 23:39:40,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 23:39:40,654 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:40,654 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:40,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 23:39:40,654 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:40,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:40,654 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-18 23:39:40,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:40,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [948133647] [2020-08-18 23:39:40,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:40,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:41,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:41,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:41,509 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:41,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [948133647] [2020-08-18 23:39:41,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:41,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 23:39:41,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547658347] [2020-08-18 23:39:41,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 23:39:41,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:41,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 23:39:41,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 23:39:41,511 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-18 23:39:42,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:42,195 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 23:39:42,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 23:39:42,196 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-18 23:39:42,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:42,196 INFO L225 Difference]: With dead ends: 48 [2020-08-18 23:39:42,197 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 23:39:42,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 23:39:42,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 23:39:42,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 23:39:42,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 23:39:42,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 23:39:42,201 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-18 23:39:42,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:42,202 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 23:39:42,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 23:39:42,202 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 23:39:42,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 23:39:42,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:42,203 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:42,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 23:39:42,203 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:42,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:42,203 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-18 23:39:42,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:42,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784901356] [2020-08-18 23:39:42,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:42,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:43,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:43,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:43,074 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:43,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784901356] [2020-08-18 23:39:43,074 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:43,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 23:39:43,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137708458] [2020-08-18 23:39:43,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 23:39:43,075 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:43,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 23:39:43,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 23:39:43,076 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-18 23:39:43,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:43,799 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-18 23:39:43,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 23:39:43,799 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-18 23:39:43,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:43,800 INFO L225 Difference]: With dead ends: 49 [2020-08-18 23:39:43,800 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 23:39:43,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 23:39:43,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 23:39:43,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 23:39:43,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 23:39:43,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 23:39:43,806 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-18 23:39:43,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:43,807 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 23:39:43,807 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 23:39:43,807 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 23:39:43,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 23:39:43,807 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:43,808 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:43,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 23:39:43,808 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:43,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:43,808 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-18 23:39:43,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:43,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [489625114] [2020-08-18 23:39:43,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:43,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:44,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:44,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:44,753 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:44,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [489625114] [2020-08-18 23:39:44,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:44,754 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 23:39:44,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002936912] [2020-08-18 23:39:44,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 23:39:44,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:44,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 23:39:44,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 23:39:44,756 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-18 23:39:45,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:45,513 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 23:39:45,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 23:39:45,513 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-18 23:39:45,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:45,514 INFO L225 Difference]: With dead ends: 50 [2020-08-18 23:39:45,514 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 23:39:45,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 23:39:45,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 23:39:45,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 23:39:45,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 23:39:45,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 23:39:45,519 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-18 23:39:45,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:45,520 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 23:39:45,520 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 23:39:45,520 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 23:39:45,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 23:39:45,520 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:45,520 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:45,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 23:39:45,521 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:45,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:45,521 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-18 23:39:45,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:45,522 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763444307] [2020-08-18 23:39:45,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:45,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:46,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:46,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:46,457 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:46,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [763444307] [2020-08-18 23:39:46,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:46,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 23:39:46,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877667357] [2020-08-18 23:39:46,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 23:39:46,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:46,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 23:39:46,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 23:39:46,459 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-18 23:39:47,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:47,318 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-18 23:39:47,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 23:39:47,318 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-18 23:39:47,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:47,319 INFO L225 Difference]: With dead ends: 51 [2020-08-18 23:39:47,319 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 23:39:47,320 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 23:39:47,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 23:39:47,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 23:39:47,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 23:39:47,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-18 23:39:47,324 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-18 23:39:47,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:47,325 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-18 23:39:47,325 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 23:39:47,325 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-18 23:39:47,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 23:39:47,325 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:47,326 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:47,326 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 23:39:47,326 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:47,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:47,326 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-18 23:39:47,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:47,327 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [879501424] [2020-08-18 23:39:47,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:47,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:48,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:48,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:48,386 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:48,386 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [879501424] [2020-08-18 23:39:48,386 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:48,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 23:39:48,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748459345] [2020-08-18 23:39:48,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 23:39:48,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:48,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 23:39:48,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 23:39:48,388 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-18 23:39:49,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:49,208 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 23:39:49,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 23:39:49,209 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-18 23:39:49,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:49,209 INFO L225 Difference]: With dead ends: 52 [2020-08-18 23:39:49,209 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 23:39:49,210 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 23:39:49,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 23:39:49,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 23:39:49,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 23:39:49,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 23:39:49,214 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-18 23:39:49,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:49,214 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 23:39:49,214 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 23:39:49,214 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 23:39:49,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 23:39:49,215 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:49,215 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:49,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 23:39:49,215 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:49,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:49,216 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-18 23:39:49,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:49,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1803771940] [2020-08-18 23:39:49,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:49,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:50,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:50,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:50,292 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:50,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1803771940] [2020-08-18 23:39:50,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:50,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 23:39:50,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910656821] [2020-08-18 23:39:50,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 23:39:50,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:50,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 23:39:50,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 23:39:50,294 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-18 23:39:51,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:51,194 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 23:39:51,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 23:39:51,195 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-18 23:39:51,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:51,196 INFO L225 Difference]: With dead ends: 53 [2020-08-18 23:39:51,196 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 23:39:51,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 23:39:51,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 23:39:51,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 23:39:51,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 23:39:51,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-18 23:39:51,202 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-18 23:39:51,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:51,202 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-18 23:39:51,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 23:39:51,202 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-18 23:39:51,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 23:39:51,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:51,203 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:51,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 23:39:51,203 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:51,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:51,204 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-18 23:39:51,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:51,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [289308632] [2020-08-18 23:39:51,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:51,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:52,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:52,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:52,335 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:52,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [289308632] [2020-08-18 23:39:52,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:52,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 23:39:52,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123156730] [2020-08-18 23:39:52,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 23:39:52,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:52,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 23:39:52,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 23:39:52,337 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-18 23:39:53,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:53,301 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 23:39:53,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 23:39:53,302 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-18 23:39:53,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:53,302 INFO L225 Difference]: With dead ends: 54 [2020-08-18 23:39:53,303 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 23:39:53,304 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 23:39:53,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 23:39:53,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 23:39:53,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 23:39:53,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 23:39:53,309 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-18 23:39:53,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:53,309 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 23:39:53,309 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 23:39:53,310 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 23:39:53,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 23:39:53,310 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:53,310 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:53,310 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 23:39:53,310 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:53,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:53,311 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-18 23:39:53,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:53,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839782089] [2020-08-18 23:39:53,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:53,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:54,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:54,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:54,470 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:54,470 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839782089] [2020-08-18 23:39:54,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:54,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 23:39:54,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159395405] [2020-08-18 23:39:54,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 23:39:54,471 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:54,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 23:39:54,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 23:39:54,472 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-18 23:39:55,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:55,468 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-18 23:39:55,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 23:39:55,468 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-18 23:39:55,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:55,469 INFO L225 Difference]: With dead ends: 55 [2020-08-18 23:39:55,469 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 23:39:55,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 23:39:55,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 23:39:55,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-18 23:39:55,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 23:39:55,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-18 23:39:55,474 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-18 23:39:55,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:55,475 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-18 23:39:55,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 23:39:55,475 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-18 23:39:55,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 23:39:55,476 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:55,476 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:55,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 23:39:55,476 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:55,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:55,476 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-18 23:39:55,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:55,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156559475] [2020-08-18 23:39:55,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:55,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:56,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:56,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:56,675 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:56,676 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156559475] [2020-08-18 23:39:56,676 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:56,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 23:39:56,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631791700] [2020-08-18 23:39:56,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 23:39:56,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:56,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 23:39:56,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 23:39:56,677 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-18 23:39:57,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:57,742 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 23:39:57,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 23:39:57,749 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-18 23:39:57,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:57,750 INFO L225 Difference]: With dead ends: 56 [2020-08-18 23:39:57,750 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 23:39:57,751 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 23:39:57,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 23:39:57,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-18 23:39:57,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 23:39:57,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 23:39:57,755 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-18 23:39:57,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:57,755 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 23:39:57,755 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 23:39:57,755 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 23:39:57,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 23:39:57,756 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:57,756 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:57,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 23:39:57,756 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:57,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:57,756 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-18 23:39:57,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:57,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849680504] [2020-08-18 23:39:57,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:57,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:59,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:59,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:59,300 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:59,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849680504] [2020-08-18 23:39:59,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:59,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 23:39:59,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447529163] [2020-08-18 23:39:59,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 23:39:59,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:59,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 23:39:59,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 23:39:59,303 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-18 23:40:00,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:00,432 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-18 23:40:00,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 23:40:00,433 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-18 23:40:00,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:00,433 INFO L225 Difference]: With dead ends: 57 [2020-08-18 23:40:00,433 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 23:40:00,434 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 23:40:00,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 23:40:00,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 23:40:00,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 23:40:00,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-18 23:40:00,439 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-18 23:40:00,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:00,439 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-18 23:40:00,440 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 23:40:00,440 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-18 23:40:00,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 23:40:00,440 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:00,440 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:00,441 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 23:40:00,441 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:00,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:00,441 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-18 23:40:00,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:00,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1459948298] [2020-08-18 23:40:00,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:00,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:01,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:01,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:01,711 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:01,711 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1459948298] [2020-08-18 23:40:01,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:01,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 23:40:01,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950042252] [2020-08-18 23:40:01,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 23:40:01,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:01,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 23:40:01,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 23:40:01,712 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-18 23:40:02,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:02,925 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 23:40:02,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 23:40:02,926 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-18 23:40:02,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:02,927 INFO L225 Difference]: With dead ends: 58 [2020-08-18 23:40:02,927 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 23:40:02,932 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 23:40:02,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 23:40:02,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-18 23:40:02,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 23:40:02,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 23:40:02,936 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-18 23:40:02,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:02,936 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 23:40:02,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 23:40:02,936 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 23:40:02,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 23:40:02,937 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:02,937 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:02,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 23:40:02,937 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:02,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:02,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-18 23:40:02,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:02,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1459764184] [2020-08-18 23:40:02,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:02,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:04,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:04,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:04,429 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:04,430 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1459764184] [2020-08-18 23:40:04,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:04,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 23:40:04,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729709894] [2020-08-18 23:40:04,431 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 23:40:04,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:04,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 23:40:04,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 23:40:04,432 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-18 23:40:05,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:05,662 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-18 23:40:05,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 23:40:05,664 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-18 23:40:05,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:05,665 INFO L225 Difference]: With dead ends: 59 [2020-08-18 23:40:05,665 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 23:40:05,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 23:40:05,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 23:40:05,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-18 23:40:05,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 23:40:05,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-18 23:40:05,670 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-18 23:40:05,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:05,670 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-18 23:40:05,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 23:40:05,670 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-18 23:40:05,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 23:40:05,671 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:05,671 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:05,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 23:40:05,671 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:05,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:05,671 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-18 23:40:05,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:05,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1618887642] [2020-08-18 23:40:05,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:05,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:07,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:07,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:07,150 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:07,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1618887642] [2020-08-18 23:40:07,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:07,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 23:40:07,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231565203] [2020-08-18 23:40:07,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 23:40:07,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:07,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 23:40:07,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 23:40:07,153 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-18 23:40:08,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:08,480 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 23:40:08,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 23:40:08,481 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-18 23:40:08,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:08,482 INFO L225 Difference]: With dead ends: 60 [2020-08-18 23:40:08,482 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 23:40:08,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 23:40:08,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 23:40:08,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 23:40:08,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 23:40:08,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 23:40:08,486 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-18 23:40:08,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:08,489 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 23:40:08,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 23:40:08,489 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 23:40:08,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 23:40:08,490 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:08,490 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:08,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 23:40:08,490 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:08,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:08,490 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-18 23:40:08,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:08,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [958778984] [2020-08-18 23:40:08,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:08,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:10,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:10,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:10,009 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:10,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [958778984] [2020-08-18 23:40:10,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:10,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 23:40:10,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681360149] [2020-08-18 23:40:10,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 23:40:10,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:10,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 23:40:10,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 23:40:10,012 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-18 23:40:11,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:11,324 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-18 23:40:11,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 23:40:11,325 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-18 23:40:11,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:11,326 INFO L225 Difference]: With dead ends: 61 [2020-08-18 23:40:11,326 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 23:40:11,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 23:40:11,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 23:40:11,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-18 23:40:11,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 23:40:11,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-18 23:40:11,331 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-18 23:40:11,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:11,331 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-18 23:40:11,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 23:40:11,331 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-18 23:40:11,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 23:40:11,332 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:11,332 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:11,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 23:40:11,332 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:11,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:11,333 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-18 23:40:11,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:11,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1165548583] [2020-08-18 23:40:11,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:11,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:12,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:12,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:12,875 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:12,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1165548583] [2020-08-18 23:40:12,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:12,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 23:40:12,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346589659] [2020-08-18 23:40:12,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 23:40:12,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:12,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 23:40:12,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 23:40:12,877 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-18 23:40:14,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:14,214 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 23:40:14,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 23:40:14,215 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-18 23:40:14,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:14,216 INFO L225 Difference]: With dead ends: 62 [2020-08-18 23:40:14,216 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 23:40:14,216 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 23:40:14,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 23:40:14,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 23:40:14,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 23:40:14,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 23:40:14,221 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-18 23:40:14,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:14,221 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 23:40:14,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 23:40:14,222 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 23:40:14,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 23:40:14,222 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:14,222 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:14,222 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 23:40:14,223 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:14,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:14,223 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-18 23:40:14,223 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:14,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2048197184] [2020-08-18 23:40:14,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:14,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:15,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:15,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:15,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:15,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2048197184] [2020-08-18 23:40:15,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:15,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 23:40:15,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045338618] [2020-08-18 23:40:15,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 23:40:15,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:15,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 23:40:15,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 23:40:15,967 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-18 23:40:17,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:17,352 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-18 23:40:17,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 23:40:17,353 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-18 23:40:17,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:17,354 INFO L225 Difference]: With dead ends: 63 [2020-08-18 23:40:17,354 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 23:40:17,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 23:40:17,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 23:40:17,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 23:40:17,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 23:40:17,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-18 23:40:17,360 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-18 23:40:17,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:17,360 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-18 23:40:17,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 23:40:17,360 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-18 23:40:17,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 23:40:17,361 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:17,361 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:17,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 23:40:17,361 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:17,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:17,361 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-18 23:40:17,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:17,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1091764785] [2020-08-18 23:40:17,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:17,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:18,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:18,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:18,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:18,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1091764785] [2020-08-18 23:40:18,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:18,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 23:40:18,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349693674] [2020-08-18 23:40:18,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 23:40:18,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:18,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 23:40:18,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 23:40:18,994 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-18 23:40:20,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:20,481 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-18 23:40:20,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-18 23:40:20,482 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-18 23:40:20,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:20,483 INFO L225 Difference]: With dead ends: 64 [2020-08-18 23:40:20,483 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 23:40:20,484 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 23:40:20,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 23:40:20,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-18 23:40:20,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 23:40:20,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-18 23:40:20,488 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-18 23:40:20,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:20,488 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-18 23:40:20,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-18 23:40:20,488 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-18 23:40:20,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 23:40:20,489 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:20,489 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:20,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-18 23:40:20,489 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:20,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:20,489 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-18 23:40:20,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:20,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [225041691] [2020-08-18 23:40:20,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:20,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat