/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 18:48:42,524 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 18:48:42,526 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 18:48:42,550 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 18:48:42,550 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 18:48:42,551 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 18:48:42,552 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 18:48:42,554 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 18:48:42,556 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 18:48:42,556 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 18:48:42,557 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 18:48:42,558 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 18:48:42,559 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 18:48:42,559 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 18:48:42,560 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 18:48:42,562 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 18:48:42,562 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 18:48:42,563 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 18:48:42,565 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 18:48:42,567 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 18:48:42,568 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 18:48:42,569 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 18:48:42,570 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 18:48:42,571 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 18:48:42,573 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 18:48:42,580 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 18:48:42,581 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 18:48:42,583 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 18:48:42,584 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 18:48:42,627 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 18:48:42,627 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 18:48:42,630 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 18:48:42,631 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 18:48:42,631 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 18:48:42,631 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 18:48:42,631 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 18:48:42,631 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 18:48:42,632 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 18:48:42,632 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 18:48:42,632 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 18:48:42,632 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 18:48:42,632 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 18:48:42,633 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 18:48:42,634 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 18:48:42,634 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 18:48:42,634 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 18:48:42,634 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 18:48:42,635 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 18:48:42,635 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 18:48:42,635 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 18:48:42,635 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 18:48:42,635 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 18:48:42,636 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 18:48:42,636 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 18:48:42,636 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 18:48:42,637 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 18:48:42,637 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 18:48:42,637 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 18:48:42,637 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=LOWLEXORDER; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=LOWLEXORDER; [2020-08-18 18:48:42,944 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 18:48:42,958 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 18:48:42,965 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 18:48:42,967 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 18:48:42,967 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 18:48:42,968 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 18:48:43,023 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f0bd68aae/405c4d785dcc422189e1dc84b821f7a7/FLAG9facdb403 [2020-08-18 18:48:43,467 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 18:48:43,468 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 18:48:43,474 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f0bd68aae/405c4d785dcc422189e1dc84b821f7a7/FLAG9facdb403 [2020-08-18 18:48:43,854 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f0bd68aae/405c4d785dcc422189e1dc84b821f7a7 [2020-08-18 18:48:43,863 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 18:48:43,864 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 18:48:43,865 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 18:48:43,865 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 18:48:43,868 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 18:48:43,869 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:48:43" (1/1) ... [2020-08-18 18:48:43,872 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@11c6fcdd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:48:43, skipping insertion in model container [2020-08-18 18:48:43,873 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:48:43" (1/1) ... [2020-08-18 18:48:43,881 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 18:48:43,899 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 18:48:44,131 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:48:44,186 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 18:48:44,204 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:48:44,352 INFO L208 MainTranslator]: Completed translation [2020-08-18 18:48:44,353 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:48:44 WrapperNode [2020-08-18 18:48:44,354 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 18:48:44,354 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 18:48:44,355 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 18:48:44,355 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 18:48:44,368 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:48:44" (1/1) ... [2020-08-18 18:48:44,370 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:48:44" (1/1) ... [2020-08-18 18:48:44,379 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:48:44" (1/1) ... [2020-08-18 18:48:44,379 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:48:44" (1/1) ... [2020-08-18 18:48:44,400 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:48:44" (1/1) ... [2020-08-18 18:48:44,408 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:48:44" (1/1) ... [2020-08-18 18:48:44,410 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:48:44" (1/1) ... [2020-08-18 18:48:44,417 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 18:48:44,418 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 18:48:44,418 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 18:48:44,418 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 18:48:44,419 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:48:44" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 18:48:44,477 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 18:48:44,477 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 18:48:44,477 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 18:48:44,477 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 18:48:44,478 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 18:48:44,478 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 18:48:44,478 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 18:48:44,479 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 18:48:44,480 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 18:48:44,480 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-18 18:48:44,481 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 18:48:44,481 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 18:48:44,749 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 18:48:44,749 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 18:48:44,753 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:48:44 BoogieIcfgContainer [2020-08-18 18:48:44,753 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 18:48:44,754 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 18:48:44,754 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 18:48:44,757 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 18:48:44,758 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 06:48:43" (1/3) ... [2020-08-18 18:48:44,758 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61cb14f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:48:44, skipping insertion in model container [2020-08-18 18:48:44,759 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:48:44" (2/3) ... [2020-08-18 18:48:44,759 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61cb14f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:48:44, skipping insertion in model container [2020-08-18 18:48:44,759 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:48:44" (3/3) ... [2020-08-18 18:48:44,761 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-18 18:48:44,769 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 18:48:44,774 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 18:48:44,787 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 18:48:44,805 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 18:48:44,805 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 18:48:44,805 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 18:48:44,805 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 18:48:44,805 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 18:48:44,806 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 18:48:44,806 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 18:48:44,806 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 18:48:44,821 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-18 18:48:44,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 18:48:44,826 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:44,827 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:44,827 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:44,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:44,833 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-18 18:48:44,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:44,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [601599437] [2020-08-18 18:48:44,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:44,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:45,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:45,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:45,093 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:45,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [601599437] [2020-08-18 18:48:45,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:48:45,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 18:48:45,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761752371] [2020-08-18 18:48:45,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 18:48:45,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:45,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 18:48:45,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 18:48:45,118 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-18 18:48:45,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:45,198 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-18 18:48:45,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 18:48:45,200 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-18 18:48:45,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:45,209 INFO L225 Difference]: With dead ends: 42 [2020-08-18 18:48:45,209 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 18:48:45,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 18:48:45,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 18:48:45,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-18 18:48:45,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 18:48:45,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 18:48:45,248 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-18 18:48:45,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:45,248 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 18:48:45,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 18:48:45,249 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 18:48:45,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 18:48:45,249 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:45,250 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:45,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 18:48:45,250 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:45,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:45,251 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-18 18:48:45,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:45,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [284970265] [2020-08-18 18:48:45,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:45,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:45,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:45,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:45,351 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:45,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [284970265] [2020-08-18 18:48:45,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:48:45,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 18:48:45,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643750147] [2020-08-18 18:48:45,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 18:48:45,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:45,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 18:48:45,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 18:48:45,355 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-18 18:48:45,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:45,459 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-18 18:48:45,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:48:45,460 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-18 18:48:45,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:45,461 INFO L225 Difference]: With dead ends: 36 [2020-08-18 18:48:45,461 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 18:48:45,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 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 18:48:45,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 18:48:45,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-18 18:48:45,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 18:48:45,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 18:48:45,469 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-18 18:48:45,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:45,469 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 18:48:45,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 18:48:45,469 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 18:48:45,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 18:48:45,470 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:45,470 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:45,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 18:48:45,471 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:45,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:45,471 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-18 18:48:45,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:45,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1084211921] [2020-08-18 18:48:45,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:45,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:45,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:45,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:45,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:45,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1084211921] [2020-08-18 18:48:45,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:48:45,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 18:48:45,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382061213] [2020-08-18 18:48:45,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 18:48:45,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:45,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 18:48:45,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 18:48:45,553 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-18 18:48:45,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:45,647 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-18 18:48:45,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:48:45,648 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-18 18:48:45,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:45,649 INFO L225 Difference]: With dead ends: 40 [2020-08-18 18:48:45,649 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 18:48:45,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 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 18:48:45,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 18:48:45,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-18 18:48:45,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 18:48:45,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-18 18:48:45,656 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-18 18:48:45,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:45,657 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-18 18:48:45,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 18:48:45,657 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-18 18:48:45,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 18:48:45,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:45,658 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:45,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 18:48:45,659 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:45,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:45,660 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-18 18:48:45,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:45,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1937624317] [2020-08-18 18:48:45,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:45,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:45,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:45,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:45,756 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:45,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1937624317] [2020-08-18 18:48:45,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:48:45,757 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 18:48:45,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997285306] [2020-08-18 18:48:45,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 18:48:45,758 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:45,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 18:48:45,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 18:48:45,759 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-18 18:48:45,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:45,825 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-18 18:48:45,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:48:45,825 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-18 18:48:45,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:45,826 INFO L225 Difference]: With dead ends: 31 [2020-08-18 18:48:45,826 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 18:48:45,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 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 18:48:45,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 18:48:45,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-18 18:48:45,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 18:48:45,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-18 18:48:45,833 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-18 18:48:45,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:45,833 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-18 18:48:45,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 18:48:45,834 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-18 18:48:45,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 18:48:45,834 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:45,835 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:45,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 18:48:45,835 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:45,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:45,836 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-18 18:48:45,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:45,836 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1917649930] [2020-08-18 18:48:45,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:45,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:45,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:45,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:45,995 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:45,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1917649930] [2020-08-18 18:48:45,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:45,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 18:48:45,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484885329] [2020-08-18 18:48:46,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 18:48:46,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:46,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 18:48:46,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 18:48:46,001 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-18 18:48:46,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:46,097 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-18 18:48:46,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 18:48:46,098 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-18 18:48:46,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:46,099 INFO L225 Difference]: With dead ends: 34 [2020-08-18 18:48:46,099 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 18:48:46,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-18 18:48:46,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 18:48:46,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-18 18:48:46,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 18:48:46,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-18 18:48:46,106 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-18 18:48:46,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:46,106 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-18 18:48:46,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 18:48:46,107 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-18 18:48:46,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 18:48:46,108 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:46,108 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:46,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 18:48:46,108 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:46,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:46,109 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-18 18:48:46,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:46,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [818081728] [2020-08-18 18:48:46,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:46,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:46,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:46,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:46,256 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:46,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [818081728] [2020-08-18 18:48:46,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:46,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 18:48:46,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413450147] [2020-08-18 18:48:46,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 18:48:46,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:46,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 18:48:46,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 18:48:46,259 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-18 18:48:46,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:46,349 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-18 18:48:46,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 18:48:46,350 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-18 18:48:46,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:46,351 INFO L225 Difference]: With dead ends: 38 [2020-08-18 18:48:46,351 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 18:48:46,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-18 18:48:46,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 18:48:46,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-18 18:48:46,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 18:48:46,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-18 18:48:46,358 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-18 18:48:46,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:46,358 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-18 18:48:46,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 18:48:46,358 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-18 18:48:46,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 18:48:46,359 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:46,359 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:46,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 18:48:46,360 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:46,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:46,360 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-18 18:48:46,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:46,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013309215] [2020-08-18 18:48:46,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:46,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:46,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:46,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:46,518 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:46,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013309215] [2020-08-18 18:48:46,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:46,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 18:48:46,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778856368] [2020-08-18 18:48:46,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 18:48:46,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:46,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 18:48:46,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 18:48:46,521 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-18 18:48:46,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:46,620 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-18 18:48:46,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 18:48:46,620 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-18 18:48:46,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:46,621 INFO L225 Difference]: With dead ends: 42 [2020-08-18 18:48:46,621 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 18:48:46,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 18:48:46,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 18:48:46,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-18 18:48:46,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 18:48:46,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-18 18:48:46,628 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-18 18:48:46,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:46,628 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-18 18:48:46,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 18:48:46,628 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-18 18:48:46,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 18:48:46,629 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:46,629 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:46,629 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 18:48:46,630 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:46,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:46,630 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-18 18:48:46,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:46,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [38149390] [2020-08-18 18:48:46,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:46,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:46,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:46,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:46,749 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:46,749 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [38149390] [2020-08-18 18:48:46,749 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:46,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 18:48:46,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422250601] [2020-08-18 18:48:46,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 18:48:46,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:46,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 18:48:46,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 18:48:46,751 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-18 18:48:46,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:46,868 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-18 18:48:46,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 18:48:46,868 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-18 18:48:46,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:46,869 INFO L225 Difference]: With dead ends: 46 [2020-08-18 18:48:46,869 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 18:48:46,870 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-18 18:48:46,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 18:48:46,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-18 18:48:46,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 18:48:46,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-18 18:48:46,875 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-18 18:48:46,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:46,876 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-18 18:48:46,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 18:48:46,876 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-18 18:48:46,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 18:48:46,877 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:46,877 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:46,877 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 18:48:46,877 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:46,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:46,877 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-18 18:48:46,878 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:46,878 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [417456678] [2020-08-18 18:48:46,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:46,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:47,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:47,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:47,021 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:47,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [417456678] [2020-08-18 18:48:47,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:47,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 18:48:47,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837253551] [2020-08-18 18:48:47,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 18:48:47,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:47,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 18:48:47,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-18 18:48:47,023 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-18 18:48:47,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:47,170 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-18 18:48:47,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 18:48:47,173 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-18 18:48:47,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:47,174 INFO L225 Difference]: With dead ends: 50 [2020-08-18 18:48:47,174 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 18:48:47,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 18:48:47,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 18:48:47,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 18:48:47,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 18:48:47,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-18 18:48:47,187 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-18 18:48:47,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:47,187 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-18 18:48:47,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 18:48:47,188 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-18 18:48:47,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 18:48:47,189 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:47,189 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:47,189 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 18:48:47,189 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:47,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:47,190 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-18 18:48:47,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:47,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473848566] [2020-08-18 18:48:47,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:47,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:47,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:47,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:47,368 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:47,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473848566] [2020-08-18 18:48:47,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:47,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 18:48:47,370 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927836335] [2020-08-18 18:48:47,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 18:48:47,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:47,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 18:48:47,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-18 18:48:47,371 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-18 18:48:47,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:47,543 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-18 18:48:47,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 18:48:47,544 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-18 18:48:47,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:47,545 INFO L225 Difference]: With dead ends: 54 [2020-08-18 18:48:47,545 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 18:48:47,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-18 18:48:47,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 18:48:47,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-18 18:48:47,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 18:48:47,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-18 18:48:47,551 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-18 18:48:47,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:47,552 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-18 18:48:47,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 18:48:47,552 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-18 18:48:47,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 18:48:47,553 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:47,553 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:47,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 18:48:47,553 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:47,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:47,554 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-18 18:48:47,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:47,554 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1554706928] [2020-08-18 18:48:47,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:47,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:47,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:47,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:47,729 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:47,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1554706928] [2020-08-18 18:48:47,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:47,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 18:48:47,730 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120975599] [2020-08-18 18:48:47,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 18:48:47,730 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:47,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 18:48:47,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-18 18:48:47,731 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-18 18:48:47,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:47,924 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-18 18:48:47,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 18:48:47,925 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-18 18:48:47,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:47,925 INFO L225 Difference]: With dead ends: 58 [2020-08-18 18:48:47,926 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 18:48:47,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-08-18 18:48:47,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 18:48:47,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-18 18:48:47,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 18:48:47,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-18 18:48:47,932 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-18 18:48:47,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:47,932 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-18 18:48:47,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 18:48:47,933 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-18 18:48:47,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 18:48:47,933 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:47,934 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:47,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 18:48:47,934 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:47,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:47,934 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-18 18:48:47,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:47,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812211109] [2020-08-18 18:48:47,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:47,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:48,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:48,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:48,114 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:48,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812211109] [2020-08-18 18:48:48,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:48,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 18:48:48,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443086715] [2020-08-18 18:48:48,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 18:48:48,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:48,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 18:48:48,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-18 18:48:48,117 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-18 18:48:48,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:48,337 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-18 18:48:48,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 18:48:48,337 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-18 18:48:48,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:48,338 INFO L225 Difference]: With dead ends: 62 [2020-08-18 18:48:48,338 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 18:48:48,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-18 18:48:48,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 18:48:48,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-18 18:48:48,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 18:48:48,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-18 18:48:48,346 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-18 18:48:48,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:48,346 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-18 18:48:48,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 18:48:48,347 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-18 18:48:48,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 18:48:48,351 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:48,351 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:48,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 18:48:48,352 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:48,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:48,352 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-18 18:48:48,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:48,353 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1791170717] [2020-08-18 18:48:48,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:48,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:48,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:48,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:48,611 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:48,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1791170717] [2020-08-18 18:48:48,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:48,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 18:48:48,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634335790] [2020-08-18 18:48:48,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 18:48:48,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:48,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 18:48:48,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-18 18:48:48,614 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-18 18:48:48,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:48,854 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-18 18:48:48,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 18:48:48,855 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-18 18:48:48,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:48,855 INFO L225 Difference]: With dead ends: 66 [2020-08-18 18:48:48,856 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 18:48:48,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-18 18:48:48,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 18:48:48,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-18 18:48:48,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 18:48:48,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-18 18:48:48,862 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-18 18:48:48,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:48,863 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-18 18:48:48,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 18:48:48,863 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-18 18:48:48,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 18:48:48,864 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:48,864 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:48,864 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 18:48:48,864 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:48,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:48,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-18 18:48:48,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:48,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [719310590] [2020-08-18 18:48:48,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:48,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:49,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:49,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:49,073 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:49,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [719310590] [2020-08-18 18:48:49,074 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:49,074 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 18:48:49,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901961832] [2020-08-18 18:48:49,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 18:48:49,075 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:49,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 18:48:49,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-18 18:48:49,076 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-18 18:48:49,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:49,351 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-18 18:48:49,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 18:48:49,352 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-18 18:48:49,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:49,352 INFO L225 Difference]: With dead ends: 70 [2020-08-18 18:48:49,353 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 18:48:49,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-18 18:48:49,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 18:48:49,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-18 18:48:49,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 18:48:49,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-18 18:48:49,359 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-18 18:48:49,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:49,359 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-18 18:48:49,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 18:48:49,360 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-18 18:48:49,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 18:48:49,360 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:49,361 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:49,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 18:48:49,361 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:49,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:49,361 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-18 18:48:49,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:49,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [213060337] [2020-08-18 18:48:49,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:49,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:49,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:49,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:49,605 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:49,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [213060337] [2020-08-18 18:48:49,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:49,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 18:48:49,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448065977] [2020-08-18 18:48:49,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 18:48:49,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:49,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 18:48:49,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-18 18:48:49,608 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-18 18:48:49,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:49,989 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-18 18:48:49,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 18:48:49,990 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-18 18:48:49,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:49,990 INFO L225 Difference]: With dead ends: 74 [2020-08-18 18:48:49,991 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 18:48:49,992 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-18 18:48:49,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 18:48:49,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-18 18:48:49,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 18:48:49,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-18 18:48:49,998 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-18 18:48:49,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:49,998 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-18 18:48:49,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 18:48:49,999 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-18 18:48:49,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 18:48:49,999 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:50,000 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:50,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 18:48:50,000 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:50,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:50,001 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-18 18:48:50,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:50,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771340996] [2020-08-18 18:48:50,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:50,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:50,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:50,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:50,289 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:50,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771340996] [2020-08-18 18:48:50,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:50,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 18:48:50,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779391238] [2020-08-18 18:48:50,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 18:48:50,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:50,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 18:48:50,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-18 18:48:50,293 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-18 18:48:50,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:50,677 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-18 18:48:50,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 18:48:50,678 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-18 18:48:50,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:50,679 INFO L225 Difference]: With dead ends: 78 [2020-08-18 18:48:50,679 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 18:48:50,680 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-08-18 18:48:50,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 18:48:50,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-18 18:48:50,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 18:48:50,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-18 18:48:50,685 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-18 18:48:50,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:50,685 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-18 18:48:50,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 18:48:50,686 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-18 18:48:50,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 18:48:50,686 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:50,686 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:50,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 18:48:50,687 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:50,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:50,687 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-18 18:48:50,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:50,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [764807252] [2020-08-18 18:48:50,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:50,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:50,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:50,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:50,958 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:50,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [764807252] [2020-08-18 18:48:50,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:50,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 18:48:50,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83318806] [2020-08-18 18:48:50,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 18:48:50,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:50,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 18:48:50,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-18 18:48:50,961 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-18 18:48:51,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:51,331 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-18 18:48:51,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 18:48:51,332 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-18 18:48:51,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:51,332 INFO L225 Difference]: With dead ends: 82 [2020-08-18 18:48:51,332 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 18:48:51,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-18 18:48:51,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 18:48:51,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-18 18:48:51,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 18:48:51,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-18 18:48:51,341 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-18 18:48:51,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:51,342 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-18 18:48:51,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 18:48:51,342 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-18 18:48:51,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 18:48:51,343 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:51,343 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:51,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 18:48:51,344 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:51,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:51,344 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-18 18:48:51,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:51,344 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407092972] [2020-08-18 18:48:51,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:51,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:51,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:51,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:51,717 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:51,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407092972] [2020-08-18 18:48:51,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:51,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 18:48:51,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970108428] [2020-08-18 18:48:51,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 18:48:51,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:51,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 18:48:51,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-18 18:48:51,719 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-18 18:48:52,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:52,179 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-18 18:48:52,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 18:48:52,180 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-18 18:48:52,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:52,181 INFO L225 Difference]: With dead ends: 86 [2020-08-18 18:48:52,181 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 18:48:52,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-18 18:48:52,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 18:48:52,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-18 18:48:52,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 18:48:52,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-18 18:48:52,187 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-18 18:48:52,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:52,187 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-18 18:48:52,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 18:48:52,188 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-18 18:48:52,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 18:48:52,188 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:52,188 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:52,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 18:48:52,189 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:52,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:52,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-18 18:48:52,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:52,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [477283885] [2020-08-18 18:48:52,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:52,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:52,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:52,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:52,510 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:52,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [477283885] [2020-08-18 18:48:52,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:52,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 18:48:52,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828256886] [2020-08-18 18:48:52,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 18:48:52,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:52,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 18:48:52,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-18 18:48:52,513 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-18 18:48:53,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:53,033 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-18 18:48:53,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 18:48:53,034 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-18 18:48:53,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:53,035 INFO L225 Difference]: With dead ends: 90 [2020-08-18 18:48:53,035 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 18:48:53,036 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-18 18:48:53,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 18:48:53,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-18 18:48:53,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 18:48:53,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-18 18:48:53,041 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-18 18:48:53,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:53,041 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-18 18:48:53,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 18:48:53,041 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-18 18:48:53,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 18:48:53,042 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:53,042 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:53,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 18:48:53,042 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:53,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:53,043 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-18 18:48:53,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:53,043 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [137535101] [2020-08-18 18:48:53,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:53,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:53,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:53,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:53,414 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:53,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [137535101] [2020-08-18 18:48:53,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:53,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 18:48:53,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837558812] [2020-08-18 18:48:53,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 18:48:53,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:53,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 18:48:53,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-18 18:48:53,417 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-18 18:48:53,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:53,961 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-18 18:48:53,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 18:48:53,962 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-18 18:48:53,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:53,963 INFO L225 Difference]: With dead ends: 94 [2020-08-18 18:48:53,963 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 18:48:53,963 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-18 18:48:53,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 18:48:53,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-18 18:48:53,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 18:48:53,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-18 18:48:53,968 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-18 18:48:53,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:53,969 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-18 18:48:53,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 18:48:53,969 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-18 18:48:53,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 18:48:53,969 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:53,970 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:53,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 18:48:53,970 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:53,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:53,970 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-18 18:48:53,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:53,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [849480071] [2020-08-18 18:48:53,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:53,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:54,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:54,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:54,332 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:54,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [849480071] [2020-08-18 18:48:54,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:54,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 18:48:54,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196317932] [2020-08-18 18:48:54,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 18:48:54,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:54,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 18:48:54,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-18 18:48:54,334 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-18 18:48:54,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:54,919 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-18 18:48:54,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 18:48:54,920 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-18 18:48:54,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:54,921 INFO L225 Difference]: With dead ends: 98 [2020-08-18 18:48:54,921 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 18:48:54,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-08-18 18:48:54,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 18:48:54,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-18 18:48:54,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 18:48:54,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-18 18:48:54,926 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-18 18:48:54,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:54,927 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-18 18:48:54,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 18:48:54,927 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-18 18:48:54,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 18:48:54,927 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:54,927 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:54,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 18:48:54,928 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:54,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:54,928 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-18 18:48:54,928 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:54,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [368513175] [2020-08-18 18:48:54,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:54,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:55,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:55,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:55,350 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:55,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [368513175] [2020-08-18 18:48:55,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:55,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 18:48:55,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345687530] [2020-08-18 18:48:55,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 18:48:55,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:55,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 18:48:55,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-18 18:48:55,352 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-18 18:48:55,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:55,959 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-18 18:48:55,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 18:48:55,965 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-18 18:48:55,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:55,966 INFO L225 Difference]: With dead ends: 102 [2020-08-18 18:48:55,966 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 18:48:55,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-18 18:48:55,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 18:48:55,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-18 18:48:55,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 18:48:55,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-18 18:48:55,975 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-18 18:48:55,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:55,976 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-18 18:48:55,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 18:48:55,976 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-18 18:48:55,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 18:48:55,976 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:55,976 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:55,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 18:48:55,977 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:55,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:55,977 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-18 18:48:55,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:55,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1272397476] [2020-08-18 18:48:55,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:56,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:56,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:56,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:56,436 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:56,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1272397476] [2020-08-18 18:48:56,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:56,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 18:48:56,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017273158] [2020-08-18 18:48:56,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 18:48:56,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:56,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 18:48:56,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-18 18:48:56,441 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-18 18:48:57,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:57,149 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-18 18:48:57,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 18:48:57,150 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-18 18:48:57,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:57,151 INFO L225 Difference]: With dead ends: 106 [2020-08-18 18:48:57,151 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 18:48:57,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-18 18:48:57,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 18:48:57,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-18 18:48:57,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 18:48:57,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-18 18:48:57,160 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-18 18:48:57,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:57,160 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-18 18:48:57,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 18:48:57,160 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-18 18:48:57,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 18:48:57,161 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:57,161 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:57,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 18:48:57,161 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:57,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:57,162 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-18 18:48:57,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:57,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1758921237] [2020-08-18 18:48:57,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:57,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:57,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:57,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:57,683 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:57,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1758921237] [2020-08-18 18:48:57,684 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:57,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 18:48:57,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860906004] [2020-08-18 18:48:57,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 18:48:57,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:57,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 18:48:57,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-18 18:48:57,685 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-18 18:48:58,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:58,400 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-18 18:48:58,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 18:48:58,401 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-18 18:48:58,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:58,401 INFO L225 Difference]: With dead ends: 110 [2020-08-18 18:48:58,401 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 18:48:58,402 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2020-08-18 18:48:58,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 18:48:58,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-18 18:48:58,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 18:48:58,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-18 18:48:58,406 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-18 18:48:58,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:58,407 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-18 18:48:58,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 18:48:58,407 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-18 18:48:58,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 18:48:58,408 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:58,408 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:58,408 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 18:48:58,408 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:58,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:58,408 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-18 18:48:58,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:58,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1303774734] [2020-08-18 18:48:58,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:58,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:58,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:48:58,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:48:58,889 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:48:58,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1303774734] [2020-08-18 18:48:58,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:48:58,890 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 18:48:58,890 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468583689] [2020-08-18 18:48:58,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 18:48:58,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:48:58,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 18:48:58,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-18 18:48:58,892 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-18 18:48:59,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:48:59,715 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-18 18:48:59,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 18:48:59,715 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-18 18:48:59,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:48:59,716 INFO L225 Difference]: With dead ends: 114 [2020-08-18 18:48:59,716 INFO L226 Difference]: Without dead ends: 63 [2020-08-18 18:48:59,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-08-18 18:48:59,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-18 18:48:59,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-18 18:48:59,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-18 18:48:59,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-18 18:48:59,721 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-18 18:48:59,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:48:59,721 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-18 18:48:59,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 18:48:59,722 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-18 18:48:59,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-18 18:48:59,722 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:48:59,722 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:48:59,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 18:48:59,722 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:48:59,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:48:59,723 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-18 18:48:59,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:48:59,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1474734399] [2020-08-18 18:48:59,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:48:59,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:00,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:00,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:00,270 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:00,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1474734399] [2020-08-18 18:49:00,270 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:00,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 18:49:00,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202122317] [2020-08-18 18:49:00,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 18:49:00,271 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:00,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 18:49:00,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-18 18:49:00,272 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-18 18:49:01,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:01,203 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-18 18:49:01,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 18:49:01,205 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-18 18:49:01,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:01,206 INFO L225 Difference]: With dead ends: 118 [2020-08-18 18:49:01,206 INFO L226 Difference]: Without dead ends: 65 [2020-08-18 18:49:01,207 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2020-08-18 18:49:01,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-18 18:49:01,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-18 18:49:01,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-18 18:49:01,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-18 18:49:01,211 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-18 18:49:01,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:01,211 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-18 18:49:01,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 18:49:01,212 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-18 18:49:01,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-18 18:49:01,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:01,212 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:01,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 18:49:01,213 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:01,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:01,213 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-18 18:49:01,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:01,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269466433] [2020-08-18 18:49:01,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:01,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:01,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:01,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:01,842 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:01,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269466433] [2020-08-18 18:49:01,843 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:01,843 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 18:49:01,843 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525841028] [2020-08-18 18:49:01,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 18:49:01,844 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:01,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 18:49:01,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-18 18:49:01,844 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-18 18:49:02,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:02,947 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-18 18:49:02,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 18:49:02,951 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-18 18:49:02,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:02,952 INFO L225 Difference]: With dead ends: 122 [2020-08-18 18:49:02,952 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 18:49:02,953 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-08-18 18:49:02,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 18:49:02,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-18 18:49:02,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 18:49:02,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-18 18:49:02,957 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-18 18:49:02,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:02,957 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-18 18:49:02,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 18:49:02,957 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-18 18:49:02,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 18:49:02,958 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:02,958 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:02,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 18:49:02,958 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:02,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:02,958 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-18 18:49:02,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:02,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460962008] [2020-08-18 18:49:02,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:02,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:03,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:03,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:03,581 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:03,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460962008] [2020-08-18 18:49:03,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:03,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 18:49:03,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265415161] [2020-08-18 18:49:03,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 18:49:03,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:03,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 18:49:03,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-18 18:49:03,583 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-18 18:49:04,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:04,632 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-18 18:49:04,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 18:49:04,643 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-18 18:49:04,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:04,644 INFO L225 Difference]: With dead ends: 126 [2020-08-18 18:49:04,644 INFO L226 Difference]: Without dead ends: 69 [2020-08-18 18:49:04,644 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-18 18:49:04,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-18 18:49:04,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-18 18:49:04,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-18 18:49:04,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-18 18:49:04,650 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-18 18:49:04,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:04,650 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-18 18:49:04,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 18:49:04,650 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-18 18:49:04,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-18 18:49:04,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:04,651 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:04,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 18:49:04,652 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:04,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:04,652 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-18 18:49:04,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:04,652 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1648214136] [2020-08-18 18:49:04,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:04,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:05,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:05,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:05,317 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:05,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1648214136] [2020-08-18 18:49:05,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:05,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 18:49:05,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605907254] [2020-08-18 18:49:05,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 18:49:05,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:05,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 18:49:05,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-18 18:49:05,319 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-18 18:49:06,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:06,468 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-18 18:49:06,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 18:49:06,471 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-18 18:49:06,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:06,472 INFO L225 Difference]: With dead ends: 130 [2020-08-18 18:49:06,472 INFO L226 Difference]: Without dead ends: 71 [2020-08-18 18:49:06,473 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-18 18:49:06,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-18 18:49:06,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-18 18:49:06,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-18 18:49:06,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-18 18:49:06,477 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-18 18:49:06,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:06,478 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-18 18:49:06,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 18:49:06,478 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-18 18:49:06,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-18 18:49:06,478 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:06,479 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:06,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 18:49:06,479 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:06,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:06,479 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-18 18:49:06,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:06,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [128571131] [2020-08-18 18:49:06,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:06,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:07,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:07,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:07,220 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:07,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [128571131] [2020-08-18 18:49:07,220 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:07,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 18:49:07,221 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685887948] [2020-08-18 18:49:07,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 18:49:07,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:07,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 18:49:07,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-18 18:49:07,222 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-18 18:49:08,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:08,467 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-18 18:49:08,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 18:49:08,469 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-18 18:49:08,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:08,470 INFO L225 Difference]: With dead ends: 134 [2020-08-18 18:49:08,470 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 18:49:08,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-18 18:49:08,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 18:49:08,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-18 18:49:08,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 18:49:08,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-18 18:49:08,476 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-18 18:49:08,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:08,476 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-18 18:49:08,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 18:49:08,476 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-18 18:49:08,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 18:49:08,477 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:08,477 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:08,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 18:49:08,477 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:08,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:08,478 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-18 18:49:08,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:08,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1534466713] [2020-08-18 18:49:08,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:08,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:09,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:09,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:09,216 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:09,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1534466713] [2020-08-18 18:49:09,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:09,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 18:49:09,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344818055] [2020-08-18 18:49:09,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 18:49:09,218 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:09,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 18:49:09,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-18 18:49:09,219 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-18 18:49:10,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:10,472 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-18 18:49:10,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 18:49:10,477 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-18 18:49:10,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:10,478 INFO L225 Difference]: With dead ends: 138 [2020-08-18 18:49:10,478 INFO L226 Difference]: Without dead ends: 75 [2020-08-18 18:49:10,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-18 18:49:10,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-18 18:49:10,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-18 18:49:10,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-18 18:49:10,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-18 18:49:10,486 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-18 18:49:10,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:10,487 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-18 18:49:10,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 18:49:10,487 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-18 18:49:10,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-18 18:49:10,487 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:10,488 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:10,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 18:49:10,488 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:10,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:10,489 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-18 18:49:10,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:10,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [767280221] [2020-08-18 18:49:10,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:10,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:11,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:11,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:11,334 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:11,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [767280221] [2020-08-18 18:49:11,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:11,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 18:49:11,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351064872] [2020-08-18 18:49:11,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 18:49:11,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:11,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 18:49:11,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-18 18:49:11,336 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-18 18:49:13,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:13,397 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-18 18:49:13,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 18:49:13,398 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-18 18:49:13,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:13,399 INFO L225 Difference]: With dead ends: 142 [2020-08-18 18:49:13,399 INFO L226 Difference]: Without dead ends: 77 [2020-08-18 18:49:13,400 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 18:49:13,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-18 18:49:13,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-18 18:49:13,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-18 18:49:13,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-18 18:49:13,408 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-18 18:49:13,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:13,410 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-18 18:49:13,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 18:49:13,410 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-18 18:49:13,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-18 18:49:13,413 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:13,413 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:13,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 18:49:13,413 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:13,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:13,414 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-18 18:49:13,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:13,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077172318] [2020-08-18 18:49:13,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:13,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:14,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:14,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:14,322 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:14,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2077172318] [2020-08-18 18:49:14,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:14,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 18:49:14,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116195119] [2020-08-18 18:49:14,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 18:49:14,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:14,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 18:49:14,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 18:49:14,324 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-18 18:49:15,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:15,820 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-18 18:49:15,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 18:49:15,821 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-18 18:49:15,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:15,822 INFO L225 Difference]: With dead ends: 146 [2020-08-18 18:49:15,822 INFO L226 Difference]: Without dead ends: 79 [2020-08-18 18:49:15,823 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 18:49:15,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-18 18:49:15,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-18 18:49:15,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 18:49:15,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-18 18:49:15,829 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-18 18:49:15,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:15,829 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-18 18:49:15,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 18:49:15,830 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-18 18:49:15,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 18:49:15,830 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:15,830 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:15,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 18:49:15,831 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:15,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:15,831 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-18 18:49:15,831 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:15,831 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602256052] [2020-08-18 18:49:15,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:15,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:16,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:16,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:16,933 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:16,933 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602256052] [2020-08-18 18:49:16,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:16,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 18:49:16,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297035457] [2020-08-18 18:49:16,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 18:49:16,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:16,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 18:49:16,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 18:49:16,940 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-18 18:49:18,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:18,491 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-18 18:49:18,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 18:49:18,492 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-18 18:49:18,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:18,493 INFO L225 Difference]: With dead ends: 150 [2020-08-18 18:49:18,493 INFO L226 Difference]: Without dead ends: 81 [2020-08-18 18:49:18,494 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 18:49:18,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-18 18:49:18,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-18 18:49:18,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-18 18:49:18,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-18 18:49:18,499 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-18 18:49:18,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:18,499 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-18 18:49:18,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 18:49:18,500 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-18 18:49:18,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-18 18:49:18,500 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:18,500 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:18,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 18:49:18,501 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:18,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:18,501 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-18 18:49:18,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:18,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1025070593] [2020-08-18 18:49:18,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:18,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:19,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:19,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:19,529 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:19,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1025070593] [2020-08-18 18:49:19,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:19,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 18:49:19,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129462587] [2020-08-18 18:49:19,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 18:49:19,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:19,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 18:49:19,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 18:49:19,532 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-18 18:49:21,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:21,254 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-18 18:49:21,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 18:49:21,254 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-18 18:49:21,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:21,255 INFO L225 Difference]: With dead ends: 154 [2020-08-18 18:49:21,255 INFO L226 Difference]: Without dead ends: 83 [2020-08-18 18:49:21,256 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 18:49:21,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-18 18:49:21,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-18 18:49:21,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-18 18:49:21,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-18 18:49:21,262 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-18 18:49:21,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:21,262 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-18 18:49:21,262 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 18:49:21,262 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-18 18:49:21,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-18 18:49:21,262 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:21,263 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:21,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 18:49:21,263 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:21,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:21,263 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-18 18:49:21,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:21,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1651209035] [2020-08-18 18:49:21,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:21,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:22,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:22,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:22,289 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:22,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1651209035] [2020-08-18 18:49:22,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:22,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 18:49:22,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173348045] [2020-08-18 18:49:22,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 18:49:22,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:22,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 18:49:22,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 18:49:22,292 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-18 18:49:24,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:24,088 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-18 18:49:24,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 18:49:24,089 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-18 18:49:24,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:24,090 INFO L225 Difference]: With dead ends: 158 [2020-08-18 18:49:24,090 INFO L226 Difference]: Without dead ends: 85 [2020-08-18 18:49:24,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 18:49:24,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-18 18:49:24,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-18 18:49:24,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 18:49:24,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-18 18:49:24,097 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-18 18:49:24,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:24,097 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-18 18:49:24,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 18:49:24,098 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-18 18:49:24,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 18:49:24,098 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:24,098 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:24,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 18:49:24,099 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:24,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:24,099 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-18 18:49:24,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:24,100 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [678052669] [2020-08-18 18:49:24,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:24,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:25,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:25,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:25,202 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:25,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [678052669] [2020-08-18 18:49:25,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:25,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 18:49:25,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738439539] [2020-08-18 18:49:25,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 18:49:25,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:25,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 18:49:25,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 18:49:25,208 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-18 18:49:27,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:27,036 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-18 18:49:27,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 18:49:27,044 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-18 18:49:27,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:27,045 INFO L225 Difference]: With dead ends: 162 [2020-08-18 18:49:27,045 INFO L226 Difference]: Without dead ends: 87 [2020-08-18 18:49:27,046 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 18:49:27,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-18 18:49:27,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-18 18:49:27,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-18 18:49:27,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-18 18:49:27,053 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-18 18:49:27,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:27,053 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-18 18:49:27,053 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 18:49:27,054 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-18 18:49:27,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-18 18:49:27,054 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:27,054 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:27,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 18:49:27,055 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:27,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:27,055 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-18 18:49:27,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:27,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1772061631] [2020-08-18 18:49:27,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:27,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:28,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:28,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:28,317 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:28,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1772061631] [2020-08-18 18:49:28,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:28,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 18:49:28,317 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407676998] [2020-08-18 18:49:28,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 18:49:28,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:28,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 18:49:28,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 18:49:28,319 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-18 18:49:30,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:30,321 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-18 18:49:30,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 18:49:30,323 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-18 18:49:30,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:30,324 INFO L225 Difference]: With dead ends: 166 [2020-08-18 18:49:30,324 INFO L226 Difference]: Without dead ends: 89 [2020-08-18 18:49:30,325 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 18:49:30,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-18 18:49:30,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-18 18:49:30,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-18 18:49:30,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-18 18:49:30,330 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-18 18:49:30,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:30,330 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-18 18:49:30,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 18:49:30,330 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-18 18:49:30,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-18 18:49:30,331 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:30,331 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:30,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 18:49:30,331 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:30,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:30,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-18 18:49:30,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:30,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [601037463] [2020-08-18 18:49:30,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:30,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:31,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:31,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:31,527 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:31,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [601037463] [2020-08-18 18:49:31,527 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:31,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 18:49:31,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356236769] [2020-08-18 18:49:31,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 18:49:31,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:31,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 18:49:31,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 18:49:31,528 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-18 18:49:33,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:33,598 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-18 18:49:33,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 18:49:33,599 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-18 18:49:33,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:33,600 INFO L225 Difference]: With dead ends: 170 [2020-08-18 18:49:33,600 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 18:49:33,601 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 18:49:33,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 18:49:33,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-18 18:49:33,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 18:49:33,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-18 18:49:33,607 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-18 18:49:33,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:33,608 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-18 18:49:33,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 18:49:33,608 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-18 18:49:33,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 18:49:33,609 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:33,609 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:33,609 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 18:49:33,609 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:33,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:33,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-18 18:49:33,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:33,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1542773463] [2020-08-18 18:49:33,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:33,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:34,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:34,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:34,915 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:34,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1542773463] [2020-08-18 18:49:34,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:34,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 18:49:34,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281009623] [2020-08-18 18:49:34,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 18:49:34,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:34,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 18:49:34,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 18:49:34,917 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-18 18:49:37,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:37,093 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-18 18:49:37,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 18:49:37,094 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-18 18:49:37,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:37,095 INFO L225 Difference]: With dead ends: 174 [2020-08-18 18:49:37,095 INFO L226 Difference]: Without dead ends: 93 [2020-08-18 18:49:37,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 18:49:37,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-18 18:49:37,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-18 18:49:37,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-18 18:49:37,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-18 18:49:37,109 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-18 18:49:37,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:37,109 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-18 18:49:37,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 18:49:37,109 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-18 18:49:37,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-18 18:49:37,112 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:37,113 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:37,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 18:49:37,113 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:37,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:37,113 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-18 18:49:37,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:37,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [117540936] [2020-08-18 18:49:37,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:37,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:38,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:38,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:38,469 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:38,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [117540936] [2020-08-18 18:49:38,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:38,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 18:49:38,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250770697] [2020-08-18 18:49:38,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 18:49:38,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:38,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 18:49:38,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 18:49:38,471 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states. [2020-08-18 18:49:40,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:40,824 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2020-08-18 18:49:40,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 18:49:40,829 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 89 [2020-08-18 18:49:40,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:40,829 INFO L225 Difference]: With dead ends: 178 [2020-08-18 18:49:40,830 INFO L226 Difference]: Without dead ends: 95 [2020-08-18 18:49:40,831 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=121, Invalid=1601, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 18:49:40,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-18 18:49:40,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2020-08-18 18:49:40,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-08-18 18:49:40,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2020-08-18 18:49:40,841 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 89 [2020-08-18 18:49:40,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:40,842 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2020-08-18 18:49:40,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 18:49:40,842 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2020-08-18 18:49:40,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-18 18:49:40,843 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:40,843 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:40,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 18:49:40,843 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:40,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:40,844 INFO L82 PathProgramCache]: Analyzing trace with hash 477506189, now seen corresponding path program 38 times [2020-08-18 18:49:40,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:40,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938454978] [2020-08-18 18:49:40,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:40,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:42,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:42,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:42,412 INFO L134 CoverageAnalysis]: Checked inductivity of 1446 backedges. 2 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:42,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938454978] [2020-08-18 18:49:42,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:42,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 18:49:42,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056402170] [2020-08-18 18:49:42,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 18:49:42,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:42,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 18:49:42,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 18:49:42,414 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 42 states.