/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 22:18:14,294 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 22:18:14,296 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 22:18:14,319 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 22:18:14,320 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 22:18:14,321 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 22:18:14,322 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 22:18:14,324 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 22:18:14,326 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 22:18:14,327 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 22:18:14,328 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 22:18:14,329 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 22:18:14,329 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 22:18:14,330 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 22:18:14,331 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 22:18:14,332 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 22:18:14,333 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 22:18:14,334 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 22:18:14,336 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 22:18:14,338 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 22:18:14,339 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 22:18:14,340 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 22:18:14,342 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 22:18:14,342 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 22:18:14,345 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 22:18:14,348 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 22:18:14,349 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 22:18:14,349 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 22:18:14,350 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 22:18:14,351 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 22:18:14,351 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 22:18:14,352 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 22:18:14,352 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 22:18:14,352 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 22:18:14,353 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 22:18:14,354 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 22:18:14,355 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 22:18:14,378 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 22:18:14,378 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 22:18:14,380 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 22:18:14,380 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 22:18:14,380 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 22:18:14,380 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 22:18:14,380 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 22:18:14,381 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 22:18:14,381 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 22:18:14,381 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 22:18:14,381 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 22:18:14,381 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 22:18:14,382 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 22:18:14,382 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 22:18:14,382 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 22:18:14,382 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 22:18:14,382 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 22:18:14,382 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 22:18:14,383 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 22:18:14,383 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 22:18:14,383 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 22:18:14,383 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 22:18:14,383 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 22:18:14,384 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 22:18:14,384 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 22:18:14,384 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 22:18:14,384 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 22:18:14,384 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 22:18:14,385 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 22:18:14,385 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; [2020-08-21 22:18:14,710 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 22:18:14,722 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 22:18:14,726 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 22:18:14,727 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 22:18:14,727 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 22:18:14,728 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-21 22:18:14,788 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b8121cbec/5e887d9633dc4a45a86ebf50d93a942a/FLAGe22b11211 [2020-08-21 22:18:15,201 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 22:18:15,202 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-21 22:18:15,209 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b8121cbec/5e887d9633dc4a45a86ebf50d93a942a/FLAGe22b11211 [2020-08-21 22:18:15,593 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b8121cbec/5e887d9633dc4a45a86ebf50d93a942a [2020-08-21 22:18:15,601 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 22:18:15,602 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 22:18:15,603 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 22:18:15,603 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 22:18:15,607 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 22:18:15,609 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 10:18:15" (1/1) ... [2020-08-21 22:18:15,613 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@11967da3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:15, skipping insertion in model container [2020-08-21 22:18:15,614 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 10:18:15" (1/1) ... [2020-08-21 22:18:15,622 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 22:18:15,640 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 22:18:15,797 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 22:18:15,802 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 22:18:15,822 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 22:18:15,843 INFO L208 MainTranslator]: Completed translation [2020-08-21 22:18:15,844 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:15 WrapperNode [2020-08-21 22:18:15,844 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 22:18:15,845 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 22:18:15,845 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 22:18:15,845 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 22:18:15,947 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:15" (1/1) ... [2020-08-21 22:18:15,948 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:15" (1/1) ... [2020-08-21 22:18:15,956 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:15" (1/1) ... [2020-08-21 22:18:15,957 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:15" (1/1) ... [2020-08-21 22:18:15,962 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:15" (1/1) ... [2020-08-21 22:18:15,967 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:15" (1/1) ... [2020-08-21 22:18:15,969 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:15" (1/1) ... [2020-08-21 22:18:15,976 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 22:18:15,977 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 22:18:15,977 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 22:18:15,977 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 22:18:15,978 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:15" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 22:18:16,042 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 22:18:16,042 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 22:18:16,042 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 22:18:16,043 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 22:18:16,043 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 22:18:16,043 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 22:18:16,043 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 22:18:16,043 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 22:18:16,044 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 22:18:16,044 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 22:18:16,044 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 22:18:16,044 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 22:18:16,044 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 22:18:16,256 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 22:18:16,256 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 22:18:16,261 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 10:18:16 BoogieIcfgContainer [2020-08-21 22:18:16,261 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 22:18:16,262 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 22:18:16,262 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 22:18:16,266 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 22:18:16,267 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 10:18:15" (1/3) ... [2020-08-21 22:18:16,268 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a3e0753 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 10:18:16, skipping insertion in model container [2020-08-21 22:18:16,268 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:15" (2/3) ... [2020-08-21 22:18:16,268 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a3e0753 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 10:18:16, skipping insertion in model container [2020-08-21 22:18:16,268 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 10:18:16" (3/3) ... [2020-08-21 22:18:16,273 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-08-21 22:18:16,281 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 22:18:16,287 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 22:18:16,300 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 22:18:16,323 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 22:18:16,323 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 22:18:16,324 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 22:18:16,324 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 22:18:16,325 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 22:18:16,325 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 22:18:16,325 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 22:18:16,325 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 22:18:16,344 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-21 22:18:16,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 22:18:16,349 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:16,350 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:16,350 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:16,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:16,355 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-08-21 22:18:16,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:16,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [446356894] [2020-08-21 22:18:16,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:16,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:16,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:16,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:16,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:16,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [446356894] [2020-08-21 22:18:16,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:18:16,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 22:18:16,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070743670] [2020-08-21 22:18:16,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 22:18:16,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:16,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 22:18:16,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 22:18:16,657 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-08-21 22:18:16,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:16,823 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-08-21 22:18:16,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 22:18:16,826 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-08-21 22:18:16,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:16,843 INFO L225 Difference]: With dead ends: 34 [2020-08-21 22:18:16,843 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 22:18:16,848 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 [2020-08-21 22:18:16,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 22:18:16,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 22:18:16,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 22:18:16,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 22:18:16,896 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 22:18:16,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:16,898 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 22:18:16,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 22:18:16,898 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 22:18:16,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 22:18:16,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:16,900 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:16,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 22:18:16,901 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:16,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:16,902 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-08-21 22:18:16,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:16,903 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [955092149] [2020-08-21 22:18:16,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:16,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:16,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:16,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:16,999 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:17,000 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [955092149] [2020-08-21 22:18:17,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:18:17,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 22:18:17,001 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862093874] [2020-08-21 22:18:17,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 22:18:17,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:17,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 22:18:17,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 22:18:17,004 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2020-08-21 22:18:17,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:17,071 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 22:18:17,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 22:18:17,072 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-21 22:18:17,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:17,073 INFO L225 Difference]: With dead ends: 22 [2020-08-21 22:18:17,073 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 22:18:17,075 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 22:18:17,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 22:18:17,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-21 22:18:17,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 22:18:17,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 22:18:17,081 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-21 22:18:17,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:17,081 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 22:18:17,081 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 22:18:17,082 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 22:18:17,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 22:18:17,082 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:17,083 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:17,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 22:18:17,083 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:17,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:17,084 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-08-21 22:18:17,084 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:17,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [462075587] [2020-08-21 22:18:17,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:17,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:17,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:17,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:17,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:17,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [462075587] [2020-08-21 22:18:17,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:17,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 22:18:17,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232683128] [2020-08-21 22:18:17,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 22:18:17,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:17,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 22:18:17,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:18:17,153 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-21 22:18:17,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:17,196 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 22:18:17,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 22:18:17,197 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-21 22:18:17,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:17,198 INFO L225 Difference]: With dead ends: 24 [2020-08-21 22:18:17,198 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 22:18:17,199 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:18:17,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 22:18:17,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-21 22:18:17,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 22:18:17,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 22:18:17,205 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-21 22:18:17,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:17,205 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 22:18:17,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 22:18:17,206 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 22:18:17,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 22:18:17,206 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:17,207 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:17,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 22:18:17,207 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:17,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:17,208 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2020-08-21 22:18:17,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:17,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1281430676] [2020-08-21 22:18:17,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:17,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:17,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:17,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:17,305 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:17,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1281430676] [2020-08-21 22:18:17,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:17,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 22:18:17,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029405768] [2020-08-21 22:18:17,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 22:18:17,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:17,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 22:18:17,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 22:18:17,315 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-21 22:18:17,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:17,378 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 22:18:17,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 22:18:17,379 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-21 22:18:17,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:17,380 INFO L225 Difference]: With dead ends: 26 [2020-08-21 22:18:17,380 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 22:18:17,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 22:18:17,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 22:18:17,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-21 22:18:17,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 22:18:17,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 22:18:17,387 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-21 22:18:17,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:17,388 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 22:18:17,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 22:18:17,388 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 22:18:17,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 22:18:17,389 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:17,389 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:17,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 22:18:17,390 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:17,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:17,390 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2020-08-21 22:18:17,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:17,391 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1774747652] [2020-08-21 22:18:17,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:17,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:17,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:17,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:17,462 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:17,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1774747652] [2020-08-21 22:18:17,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:17,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 22:18:17,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405142680] [2020-08-21 22:18:17,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 22:18:17,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:17,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 22:18:17,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 22:18:17,465 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-21 22:18:17,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:17,519 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 22:18:17,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 22:18:17,520 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-21 22:18:17,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:17,521 INFO L225 Difference]: With dead ends: 28 [2020-08-21 22:18:17,521 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 22:18:17,522 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 22:18:17,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 22:18:17,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 22:18:17,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 22:18:17,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 22:18:17,528 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-21 22:18:17,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:17,528 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 22:18:17,529 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 22:18:17,529 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 22:18:17,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 22:18:17,530 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:17,530 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:17,530 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 22:18:17,530 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:17,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:17,531 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2020-08-21 22:18:17,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:17,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10375995] [2020-08-21 22:18:17,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:17,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:17,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:17,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:17,643 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:17,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10375995] [2020-08-21 22:18:17,644 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:17,644 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 22:18:17,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506374572] [2020-08-21 22:18:17,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 22:18:17,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:17,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 22:18:17,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 22:18:17,648 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-21 22:18:17,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:17,715 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 22:18:17,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 22:18:17,716 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-21 22:18:17,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:17,717 INFO L225 Difference]: With dead ends: 30 [2020-08-21 22:18:17,717 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 22:18:17,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 22:18:17,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 22:18:17,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 22:18:17,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 22:18:17,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 22:18:17,729 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-21 22:18:17,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:17,730 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 22:18:17,730 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 22:18:17,731 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 22:18:17,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 22:18:17,733 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:17,733 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:17,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 22:18:17,734 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:17,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:17,734 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2020-08-21 22:18:17,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:17,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [884218821] [2020-08-21 22:18:17,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:17,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:17,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:17,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:17,855 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:17,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [884218821] [2020-08-21 22:18:17,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:17,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 22:18:17,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370090646] [2020-08-21 22:18:17,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 22:18:17,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:17,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 22:18:17,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 22:18:17,858 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-21 22:18:17,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:17,911 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 22:18:17,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 22:18:17,911 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-21 22:18:17,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:17,912 INFO L225 Difference]: With dead ends: 32 [2020-08-21 22:18:17,912 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 22:18:17,913 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 22:18:17,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 22:18:17,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 22:18:17,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 22:18:17,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 22:18:17,919 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-21 22:18:17,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:17,919 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 22:18:17,919 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 22:18:17,920 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 22:18:17,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 22:18:17,920 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:17,921 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:17,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 22:18:17,921 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:17,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:17,921 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2020-08-21 22:18:17,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:17,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267643812] [2020-08-21 22:18:17,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:17,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:18,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,016 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:18,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267643812] [2020-08-21 22:18:18,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:18,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 22:18:18,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329496146] [2020-08-21 22:18:18,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 22:18:18,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:18,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 22:18:18,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 22:18:18,018 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-21 22:18:18,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:18,085 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 22:18:18,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 22:18:18,086 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-21 22:18:18,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:18,087 INFO L225 Difference]: With dead ends: 34 [2020-08-21 22:18:18,087 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 22:18:18,087 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 22:18:18,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 22:18:18,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 22:18:18,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 22:18:18,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 22:18:18,093 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-21 22:18:18,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:18,093 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 22:18:18,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 22:18:18,093 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 22:18:18,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 22:18:18,094 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:18,095 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:18,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 22:18:18,095 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:18,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:18,096 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2020-08-21 22:18:18,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:18,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623303723] [2020-08-21 22:18:18,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:18,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:18,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,193 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:18,193 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623303723] [2020-08-21 22:18:18,194 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:18,194 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 22:18:18,194 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468889684] [2020-08-21 22:18:18,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 22:18:18,195 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:18,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 22:18:18,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 22:18:18,196 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 11 states. [2020-08-21 22:18:18,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:18,264 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 22:18:18,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 22:18:18,265 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2020-08-21 22:18:18,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:18,266 INFO L225 Difference]: With dead ends: 36 [2020-08-21 22:18:18,266 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 22:18:18,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 22:18:18,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 22:18:18,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 22:18:18,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 22:18:18,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 22:18:18,271 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-21 22:18:18,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:18,272 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 22:18:18,272 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 22:18:18,272 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 22:18:18,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 22:18:18,273 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:18,273 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:18,273 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 22:18:18,274 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:18,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:18,274 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2020-08-21 22:18:18,274 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:18,274 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2122360560] [2020-08-21 22:18:18,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:18,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:18,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,384 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:18,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2122360560] [2020-08-21 22:18:18,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:18,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 22:18:18,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481728983] [2020-08-21 22:18:18,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 22:18:18,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:18,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 22:18:18,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 22:18:18,386 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 12 states. [2020-08-21 22:18:18,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:18,464 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 22:18:18,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 22:18:18,464 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-08-21 22:18:18,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:18,465 INFO L225 Difference]: With dead ends: 38 [2020-08-21 22:18:18,465 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 22:18:18,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 22:18:18,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 22:18:18,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 22:18:18,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 22:18:18,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 22:18:18,472 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-08-21 22:18:18,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:18,472 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 22:18:18,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 22:18:18,473 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 22:18:18,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 22:18:18,474 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:18,474 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:18,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 22:18:18,474 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:18,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:18,475 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2020-08-21 22:18:18,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:18,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1537375419] [2020-08-21 22:18:18,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:18,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:18,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,622 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:18,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1537375419] [2020-08-21 22:18:18,623 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:18,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 22:18:18,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742751979] [2020-08-21 22:18:18,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 22:18:18,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:18,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 22:18:18,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 22:18:18,626 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 13 states. [2020-08-21 22:18:18,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:18,705 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 22:18:18,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 22:18:18,706 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-08-21 22:18:18,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:18,707 INFO L225 Difference]: With dead ends: 40 [2020-08-21 22:18:18,707 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 22:18:18,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 22:18:18,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 22:18:18,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 22:18:18,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 22:18:18,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 22:18:18,716 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-08-21 22:18:18,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:18,717 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 22:18:18,717 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 22:18:18,718 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 22:18:18,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 22:18:18,718 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:18,719 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:18,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 22:18:18,719 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:18,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:18,720 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2020-08-21 22:18:18,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:18,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [426561016] [2020-08-21 22:18:18,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:18,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:18,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,867 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:18,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [426561016] [2020-08-21 22:18:18,868 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:18,868 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 22:18:18,868 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597223844] [2020-08-21 22:18:18,869 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 22:18:18,869 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:18,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 22:18:18,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 22:18:18,870 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-08-21 22:18:18,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:18,932 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 22:18:18,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 22:18:18,933 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-08-21 22:18:18,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:18,934 INFO L225 Difference]: With dead ends: 42 [2020-08-21 22:18:18,934 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 22:18:18,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 22:18:18,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 22:18:18,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 22:18:18,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 22:18:18,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 22:18:18,939 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-08-21 22:18:18,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:18,940 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 22:18:18,940 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 22:18:18,940 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 22:18:18,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 22:18:18,941 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:18,941 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:18,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 22:18:18,942 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:18,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:18,942 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2020-08-21 22:18:18,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:18,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703780966] [2020-08-21 22:18:18,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:18,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:19,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,081 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:19,082 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703780966] [2020-08-21 22:18:19,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:19,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 22:18:19,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903211090] [2020-08-21 22:18:19,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 22:18:19,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:19,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 22:18:19,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 22:18:19,084 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 15 states. [2020-08-21 22:18:19,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:19,167 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 22:18:19,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 22:18:19,167 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2020-08-21 22:18:19,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:19,168 INFO L225 Difference]: With dead ends: 44 [2020-08-21 22:18:19,168 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 22:18:19,169 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 22:18:19,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 22:18:19,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 22:18:19,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 22:18:19,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 22:18:19,176 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-08-21 22:18:19,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:19,177 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 22:18:19,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 22:18:19,177 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 22:18:19,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 22:18:19,178 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:19,178 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:19,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 22:18:19,178 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:19,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:19,179 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2020-08-21 22:18:19,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:19,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115434394] [2020-08-21 22:18:19,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:19,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:19,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,395 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:19,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115434394] [2020-08-21 22:18:19,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:19,395 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 22:18:19,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073416584] [2020-08-21 22:18:19,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 22:18:19,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:19,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 22:18:19,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 22:18:19,397 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 16 states. [2020-08-21 22:18:19,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:19,461 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 22:18:19,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 22:18:19,462 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-08-21 22:18:19,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:19,462 INFO L225 Difference]: With dead ends: 46 [2020-08-21 22:18:19,462 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 22:18:19,463 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 22:18:19,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 22:18:19,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 22:18:19,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 22:18:19,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 22:18:19,469 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-08-21 22:18:19,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:19,470 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 22:18:19,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 22:18:19,470 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 22:18:19,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 22:18:19,473 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:19,474 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:19,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 22:18:19,474 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:19,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:19,474 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2020-08-21 22:18:19,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:19,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [86379375] [2020-08-21 22:18:19,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:19,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:19,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,658 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:19,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [86379375] [2020-08-21 22:18:19,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:19,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 22:18:19,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034676713] [2020-08-21 22:18:19,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 22:18:19,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:19,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 22:18:19,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 22:18:19,661 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 17 states. [2020-08-21 22:18:19,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:19,748 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 22:18:19,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 22:18:19,748 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-08-21 22:18:19,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:19,749 INFO L225 Difference]: With dead ends: 48 [2020-08-21 22:18:19,749 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 22:18:19,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 22:18:19,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 22:18:19,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 22:18:19,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 22:18:19,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 22:18:19,760 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-08-21 22:18:19,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:19,760 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 22:18:19,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 22:18:19,760 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 22:18:19,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 22:18:19,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:19,761 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:19,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 22:18:19,762 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:19,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:19,762 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2020-08-21 22:18:19,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:19,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [319639453] [2020-08-21 22:18:19,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:19,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:19,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,949 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:19,949 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [319639453] [2020-08-21 22:18:19,949 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:19,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 22:18:19,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482548622] [2020-08-21 22:18:19,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 22:18:19,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:19,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 22:18:19,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 22:18:19,951 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 18 states. [2020-08-21 22:18:20,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:20,054 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 22:18:20,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 22:18:20,055 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-21 22:18:20,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:20,056 INFO L225 Difference]: With dead ends: 50 [2020-08-21 22:18:20,056 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 22:18:20,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 22:18:20,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 22:18:20,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 22:18:20,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 22:18:20,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 22:18:20,062 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-08-21 22:18:20,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:20,062 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 22:18:20,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 22:18:20,062 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 22:18:20,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 22:18:20,064 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:20,064 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:20,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 22:18:20,064 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:20,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:20,064 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2020-08-21 22:18:20,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:20,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [106550693] [2020-08-21 22:18:20,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:20,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:20,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:20,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:20,290 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:20,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [106550693] [2020-08-21 22:18:20,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:20,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 22:18:20,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509384064] [2020-08-21 22:18:20,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 22:18:20,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:20,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 22:18:20,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 22:18:20,292 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 19 states. [2020-08-21 22:18:20,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:20,399 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 22:18:20,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 22:18:20,399 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2020-08-21 22:18:20,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:20,400 INFO L225 Difference]: With dead ends: 52 [2020-08-21 22:18:20,400 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 22:18:20,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 22:18:20,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 22:18:20,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 22:18:20,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 22:18:20,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 22:18:20,406 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-08-21 22:18:20,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:20,406 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 22:18:20,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 22:18:20,406 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 22:18:20,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 22:18:20,407 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:20,407 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:20,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 22:18:20,408 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:20,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:20,408 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2020-08-21 22:18:20,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:20,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1716367000] [2020-08-21 22:18:20,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:20,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:20,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:20,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:20,637 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:20,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1716367000] [2020-08-21 22:18:20,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:20,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 22:18:20,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716167498] [2020-08-21 22:18:20,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 22:18:20,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:20,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 22:18:20,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 22:18:20,640 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 20 states. [2020-08-21 22:18:20,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:20,766 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 22:18:20,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 22:18:20,767 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2020-08-21 22:18:20,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:20,768 INFO L225 Difference]: With dead ends: 54 [2020-08-21 22:18:20,768 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 22:18:20,769 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 22:18:20,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 22:18:20,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-21 22:18:20,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 22:18:20,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 22:18:20,775 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-08-21 22:18:20,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:20,775 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 22:18:20,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 22:18:20,775 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 22:18:20,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 22:18:20,776 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:20,776 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:20,776 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 22:18:20,777 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:20,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:20,777 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2020-08-21 22:18:20,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:20,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [847092348] [2020-08-21 22:18:20,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:20,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:21,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:21,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:21,069 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:21,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [847092348] [2020-08-21 22:18:21,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:21,070 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 22:18:21,070 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792325987] [2020-08-21 22:18:21,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 22:18:21,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:21,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 22:18:21,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 22:18:21,073 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 21 states. [2020-08-21 22:18:21,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:21,168 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 22:18:21,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 22:18:21,169 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2020-08-21 22:18:21,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:21,169 INFO L225 Difference]: With dead ends: 56 [2020-08-21 22:18:21,170 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 22:18:21,170 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 22:18:21,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 22:18:21,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-21 22:18:21,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 22:18:21,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 22:18:21,178 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-08-21 22:18:21,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:21,179 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 22:18:21,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 22:18:21,179 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 22:18:21,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 22:18:21,180 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:21,181 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:21,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 22:18:21,181 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:21,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:21,182 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2020-08-21 22:18:21,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:21,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1045354596] [2020-08-21 22:18:21,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:21,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:21,566 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:21,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:21,573 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:21,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1045354596] [2020-08-21 22:18:21,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:21,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 22:18:21,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108573953] [2020-08-21 22:18:21,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 22:18:21,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:21,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 22:18:21,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 22:18:21,576 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 22 states. [2020-08-21 22:18:21,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:21,672 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 22:18:21,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 22:18:21,673 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2020-08-21 22:18:21,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:21,673 INFO L225 Difference]: With dead ends: 58 [2020-08-21 22:18:21,673 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 22:18:21,674 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 22:18:21,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 22:18:21,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 22:18:21,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 22:18:21,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 22:18:21,678 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-08-21 22:18:21,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:21,679 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 22:18:21,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 22:18:21,679 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 22:18:21,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 22:18:21,680 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:21,680 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:21,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 22:18:21,681 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:21,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:21,681 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2020-08-21 22:18:21,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:21,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1288983263] [2020-08-21 22:18:21,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:21,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:21,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:21,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:21,964 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:21,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1288983263] [2020-08-21 22:18:21,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:21,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 22:18:21,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777709191] [2020-08-21 22:18:21,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 22:18:21,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:21,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 22:18:21,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 22:18:21,966 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 23 states. [2020-08-21 22:18:22,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:22,121 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 22:18:22,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 22:18:22,122 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2020-08-21 22:18:22,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:22,123 INFO L225 Difference]: With dead ends: 60 [2020-08-21 22:18:22,123 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 22:18:22,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 22:18:22,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 22:18:22,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 22:18:22,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 22:18:22,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 22:18:22,128 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-08-21 22:18:22,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:22,128 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 22:18:22,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 22:18:22,129 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 22:18:22,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 22:18:22,129 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:22,129 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:22,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 22:18:22,130 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:22,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:22,130 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2020-08-21 22:18:22,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:22,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89887003] [2020-08-21 22:18:22,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:22,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:22,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:22,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:22,428 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:22,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89887003] [2020-08-21 22:18:22,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:22,429 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 22:18:22,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740656060] [2020-08-21 22:18:22,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 22:18:22,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:22,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 22:18:22,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-21 22:18:22,430 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 24 states. [2020-08-21 22:18:22,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:22,513 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 22:18:22,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 22:18:22,516 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 52 [2020-08-21 22:18:22,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:22,516 INFO L225 Difference]: With dead ends: 62 [2020-08-21 22:18:22,517 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 22:18:22,517 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-21 22:18:22,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 22:18:22,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 22:18:22,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 22:18:22,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 22:18:22,522 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-08-21 22:18:22,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:22,522 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 22:18:22,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 22:18:22,523 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 22:18:22,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 22:18:22,523 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:22,524 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:22,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 22:18:22,526 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:22,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:22,526 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2020-08-21 22:18:22,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:22,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10907991] [2020-08-21 22:18:22,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:22,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:22,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:22,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:22,879 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:22,880 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10907991] [2020-08-21 22:18:22,880 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:22,880 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 22:18:22,880 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810807944] [2020-08-21 22:18:22,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 22:18:22,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:22,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 22:18:22,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-21 22:18:22,885 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 25 states. [2020-08-21 22:18:22,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:22,986 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-21 22:18:22,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 22:18:22,986 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2020-08-21 22:18:22,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:22,987 INFO L225 Difference]: With dead ends: 64 [2020-08-21 22:18:22,987 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 22:18:22,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-21 22:18:22,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 22:18:22,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 22:18:22,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 22:18:22,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 22:18:22,999 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-08-21 22:18:22,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:22,999 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 22:18:22,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 22:18:22,999 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 22:18:23,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 22:18:23,000 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:23,000 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:23,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 22:18:23,005 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:23,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:23,005 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2020-08-21 22:18:23,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:23,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1076884451] [2020-08-21 22:18:23,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:23,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:23,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:23,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:23,364 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:23,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1076884451] [2020-08-21 22:18:23,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:23,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 22:18:23,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397451232] [2020-08-21 22:18:23,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 22:18:23,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:23,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 22:18:23,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-21 22:18:23,367 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 26 states. [2020-08-21 22:18:23,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:23,508 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-08-21 22:18:23,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 22:18:23,509 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 56 [2020-08-21 22:18:23,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:23,510 INFO L225 Difference]: With dead ends: 66 [2020-08-21 22:18:23,510 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 22:18:23,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-21 22:18:23,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 22:18:23,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 22:18:23,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 22:18:23,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-21 22:18:23,515 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-08-21 22:18:23,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:23,515 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-21 22:18:23,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 22:18:23,516 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-21 22:18:23,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 22:18:23,520 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:23,520 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:23,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 22:18:23,520 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:23,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:23,521 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2020-08-21 22:18:23,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:23,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1470565301] [2020-08-21 22:18:23,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:23,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:23,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:23,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:23,905 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:23,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1470565301] [2020-08-21 22:18:23,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:23,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 22:18:23,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080048978] [2020-08-21 22:18:23,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 22:18:23,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:23,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 22:18:23,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-21 22:18:23,907 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 27 states. [2020-08-21 22:18:24,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:24,084 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-08-21 22:18:24,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 22:18:24,084 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 58 [2020-08-21 22:18:24,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:24,085 INFO L225 Difference]: With dead ends: 68 [2020-08-21 22:18:24,085 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 22:18:24,086 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-21 22:18:24,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 22:18:24,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 22:18:24,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 22:18:24,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-08-21 22:18:24,092 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-08-21 22:18:24,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:24,092 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-08-21 22:18:24,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 22:18:24,092 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-08-21 22:18:24,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 22:18:24,093 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:24,093 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:24,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 22:18:24,094 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:24,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:24,094 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2020-08-21 22:18:24,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:24,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [131839214] [2020-08-21 22:18:24,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:24,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:24,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:24,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:24,522 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:24,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [131839214] [2020-08-21 22:18:24,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:24,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 22:18:24,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986599055] [2020-08-21 22:18:24,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 22:18:24,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:24,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 22:18:24,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-21 22:18:24,524 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 28 states. [2020-08-21 22:18:24,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:24,716 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-08-21 22:18:24,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 22:18:24,717 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 60 [2020-08-21 22:18:24,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:24,718 INFO L225 Difference]: With dead ends: 70 [2020-08-21 22:18:24,718 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 22:18:24,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-21 22:18:24,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 22:18:24,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 22:18:24,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 22:18:24,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-08-21 22:18:24,722 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-08-21 22:18:24,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:24,723 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-08-21 22:18:24,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 22:18:24,723 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-08-21 22:18:24,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 22:18:24,724 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:24,724 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:24,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 22:18:24,724 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:24,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:24,724 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2020-08-21 22:18:24,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:24,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328858172] [2020-08-21 22:18:24,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:24,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:25,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:25,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:25,181 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:25,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328858172] [2020-08-21 22:18:25,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:25,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 22:18:25,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233498116] [2020-08-21 22:18:25,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 22:18:25,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:25,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 22:18:25,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-21 22:18:25,184 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 29 states. [2020-08-21 22:18:25,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:25,361 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-08-21 22:18:25,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 22:18:25,362 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2020-08-21 22:18:25,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:25,363 INFO L225 Difference]: With dead ends: 72 [2020-08-21 22:18:25,363 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 22:18:25,366 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-21 22:18:25,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 22:18:25,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 22:18:25,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 22:18:25,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-08-21 22:18:25,370 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-08-21 22:18:25,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:25,370 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-08-21 22:18:25,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 22:18:25,370 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-08-21 22:18:25,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 22:18:25,371 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:25,371 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:25,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 22:18:25,372 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:25,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:25,372 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2020-08-21 22:18:25,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:25,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [358592711] [2020-08-21 22:18:25,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:25,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:25,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:25,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:25,825 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:25,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [358592711] [2020-08-21 22:18:25,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:25,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 22:18:25,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644016906] [2020-08-21 22:18:25,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 22:18:25,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:25,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 22:18:25,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-21 22:18:25,827 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 30 states. [2020-08-21 22:18:25,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:25,992 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-08-21 22:18:25,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 22:18:25,992 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 64 [2020-08-21 22:18:25,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:25,993 INFO L225 Difference]: With dead ends: 74 [2020-08-21 22:18:25,993 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 22:18:25,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-21 22:18:25,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 22:18:25,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 22:18:25,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 22:18:25,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-08-21 22:18:25,998 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-08-21 22:18:25,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:25,999 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-08-21 22:18:25,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 22:18:25,999 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-08-21 22:18:25,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 22:18:25,999 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:25,999 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:26,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 22:18:26,000 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:26,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:26,000 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2020-08-21 22:18:26,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:26,000 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069237143] [2020-08-21 22:18:26,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:26,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:26,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:26,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:26,502 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:26,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069237143] [2020-08-21 22:18:26,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:26,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 22:18:26,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781382451] [2020-08-21 22:18:26,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 22:18:26,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:26,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 22:18:26,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-21 22:18:26,505 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 31 states. [2020-08-21 22:18:26,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:26,694 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-08-21 22:18:26,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 22:18:26,694 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 66 [2020-08-21 22:18:26,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:26,695 INFO L225 Difference]: With dead ends: 76 [2020-08-21 22:18:26,695 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 22:18:26,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-21 22:18:26,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 22:18:26,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 22:18:26,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 22:18:26,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-08-21 22:18:26,700 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-08-21 22:18:26,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:26,701 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-08-21 22:18:26,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 22:18:26,701 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-08-21 22:18:26,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 22:18:26,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:26,702 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:26,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 22:18:26,702 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:26,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:26,703 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2020-08-21 22:18:26,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:26,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156889140] [2020-08-21 22:18:26,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:26,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:27,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:27,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:27,216 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:27,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156889140] [2020-08-21 22:18:27,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:27,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 22:18:27,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776049140] [2020-08-21 22:18:27,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 22:18:27,218 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:27,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 22:18:27,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-21 22:18:27,219 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 32 states. [2020-08-21 22:18:27,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:27,427 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-08-21 22:18:27,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 22:18:27,427 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2020-08-21 22:18:27,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:27,429 INFO L225 Difference]: With dead ends: 78 [2020-08-21 22:18:27,429 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 22:18:27,430 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-21 22:18:27,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 22:18:27,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 22:18:27,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 22:18:27,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-08-21 22:18:27,434 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-08-21 22:18:27,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:27,434 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-08-21 22:18:27,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 22:18:27,434 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-08-21 22:18:27,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 22:18:27,435 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:27,435 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:27,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 22:18:27,435 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:27,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:27,436 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2020-08-21 22:18:27,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:27,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [71294546] [2020-08-21 22:18:27,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:27,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:27,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:27,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:27,999 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:28,000 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [71294546] [2020-08-21 22:18:28,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:28,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 22:18:28,001 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980065354] [2020-08-21 22:18:28,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 22:18:28,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:28,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 22:18:28,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 22:18:28,003 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 33 states. [2020-08-21 22:18:28,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:28,172 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-08-21 22:18:28,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 22:18:28,173 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 70 [2020-08-21 22:18:28,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:28,174 INFO L225 Difference]: With dead ends: 80 [2020-08-21 22:18:28,174 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 22:18:28,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 22:18:28,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 22:18:28,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 22:18:28,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 22:18:28,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-08-21 22:18:28,179 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-08-21 22:18:28,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:28,179 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-08-21 22:18:28,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 22:18:28,179 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-08-21 22:18:28,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 22:18:28,180 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:28,180 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:28,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 22:18:28,180 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:28,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:28,181 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2020-08-21 22:18:28,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:28,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1507458454] [2020-08-21 22:18:28,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:28,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:28,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:28,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:28,826 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:28,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1507458454] [2020-08-21 22:18:28,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:28,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 22:18:28,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579467400] [2020-08-21 22:18:28,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 22:18:28,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:28,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 22:18:28,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 22:18:28,830 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 34 states. [2020-08-21 22:18:29,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:29,046 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-08-21 22:18:29,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 22:18:29,047 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2020-08-21 22:18:29,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:29,048 INFO L225 Difference]: With dead ends: 82 [2020-08-21 22:18:29,048 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 22:18:29,049 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 22:18:29,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 22:18:29,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 22:18:29,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 22:18:29,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-08-21 22:18:29,060 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-08-21 22:18:29,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:29,062 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-08-21 22:18:29,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 22:18:29,062 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-08-21 22:18:29,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 22:18:29,063 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:29,063 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:29,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 22:18:29,064 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:29,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:29,065 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2020-08-21 22:18:29,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:29,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [60092166] [2020-08-21 22:18:29,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:29,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:29,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:29,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:29,659 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:29,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [60092166] [2020-08-21 22:18:29,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:29,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 22:18:29,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613295578] [2020-08-21 22:18:29,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 22:18:29,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:29,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 22:18:29,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 22:18:29,661 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 35 states. [2020-08-21 22:18:29,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:29,890 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-08-21 22:18:29,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 22:18:29,890 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-08-21 22:18:29,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:29,891 INFO L225 Difference]: With dead ends: 84 [2020-08-21 22:18:29,892 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 22:18:29,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 22:18:29,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 22:18:29,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 22:18:29,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 22:18:29,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-08-21 22:18:29,897 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-08-21 22:18:29,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:29,898 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-08-21 22:18:29,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 22:18:29,898 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-08-21 22:18:29,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 22:18:29,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:29,899 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:29,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 22:18:29,899 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:29,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:29,900 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2020-08-21 22:18:29,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:29,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [121627976] [2020-08-21 22:18:29,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:29,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:30,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:30,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:30,588 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:30,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [121627976] [2020-08-21 22:18:30,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:30,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 22:18:30,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364500743] [2020-08-21 22:18:30,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 22:18:30,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:30,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 22:18:30,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 22:18:30,590 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 36 states. [2020-08-21 22:18:30,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:30,741 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2020-08-21 22:18:30,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 22:18:30,742 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 76 [2020-08-21 22:18:30,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:30,743 INFO L225 Difference]: With dead ends: 86 [2020-08-21 22:18:30,743 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 22:18:30,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 22:18:30,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 22:18:30,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 22:18:30,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 22:18:30,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-08-21 22:18:30,747 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-08-21 22:18:30,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:30,748 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-08-21 22:18:30,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 22:18:30,748 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-08-21 22:18:30,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 22:18:30,749 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:30,749 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:30,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 22:18:30,749 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:30,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:30,750 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2020-08-21 22:18:30,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:30,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2080291887] [2020-08-21 22:18:30,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:30,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:31,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:31,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:31,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:31,478 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2080291887] [2020-08-21 22:18:31,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:31,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 22:18:31,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964549749] [2020-08-21 22:18:31,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 22:18:31,479 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:31,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 22:18:31,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 22:18:31,480 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 37 states. [2020-08-21 22:18:31,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:31,714 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2020-08-21 22:18:31,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 22:18:31,715 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 78 [2020-08-21 22:18:31,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:31,716 INFO L225 Difference]: With dead ends: 88 [2020-08-21 22:18:31,716 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 22:18:31,717 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 22:18:31,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 22:18:31,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 22:18:31,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 22:18:31,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2020-08-21 22:18:31,721 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2020-08-21 22:18:31,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:31,722 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2020-08-21 22:18:31,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 22:18:31,722 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2020-08-21 22:18:31,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 22:18:31,722 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:31,722 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:31,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 22:18:31,723 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:31,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:31,723 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2020-08-21 22:18:31,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:31,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1026776775] [2020-08-21 22:18:31,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:31,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:32,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:32,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:32,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:32,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1026776775] [2020-08-21 22:18:32,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:32,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 22:18:32,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526821327] [2020-08-21 22:18:32,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 22:18:32,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:32,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 22:18:32,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 22:18:32,492 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 38 states. [2020-08-21 22:18:32,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:32,706 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2020-08-21 22:18:32,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 22:18:32,707 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 80 [2020-08-21 22:18:32,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:32,708 INFO L225 Difference]: With dead ends: 90 [2020-08-21 22:18:32,708 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 22:18:32,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 22:18:32,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 22:18:32,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 22:18:32,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 22:18:32,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2020-08-21 22:18:32,713 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2020-08-21 22:18:32,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:32,714 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2020-08-21 22:18:32,714 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 22:18:32,714 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2020-08-21 22:18:32,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 22:18:32,715 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:32,715 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:32,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 22:18:32,715 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:32,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:32,715 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2020-08-21 22:18:32,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:32,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2132116206] [2020-08-21 22:18:32,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:32,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:33,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:33,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:33,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:33,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2132116206] [2020-08-21 22:18:33,505 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:33,505 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 22:18:33,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141346381] [2020-08-21 22:18:33,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 22:18:33,506 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:33,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 22:18:33,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 22:18:33,507 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 39 states. [2020-08-21 22:18:33,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:33,644 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2020-08-21 22:18:33,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 22:18:33,645 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2020-08-21 22:18:33,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:33,646 INFO L225 Difference]: With dead ends: 92 [2020-08-21 22:18:33,646 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 22:18:33,647 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 22:18:33,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 22:18:33,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 22:18:33,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 22:18:33,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2020-08-21 22:18:33,651 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2020-08-21 22:18:33,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:33,652 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2020-08-21 22:18:33,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 22:18:33,652 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2020-08-21 22:18:33,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 22:18:33,653 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:33,653 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:33,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 22:18:33,653 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:33,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:33,654 INFO L82 PathProgramCache]: Analyzing trace with hash 1557780453, now seen corresponding path program 36 times [2020-08-21 22:18:33,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:33,654 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1247856864] [2020-08-21 22:18:33,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:33,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:34,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:34,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:34,508 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:34,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1247856864] [2020-08-21 22:18:34,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:34,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 22:18:34,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944495643] [2020-08-21 22:18:34,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 22:18:34,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:34,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 22:18:34,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 22:18:34,511 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 40 states. [2020-08-21 22:18:34,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:34,756 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2020-08-21 22:18:34,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 22:18:34,756 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 84 [2020-08-21 22:18:34,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:34,757 INFO L225 Difference]: With dead ends: 94 [2020-08-21 22:18:34,758 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 22:18:34,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 22:18:34,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 22:18:34,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 22:18:34,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 22:18:34,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2020-08-21 22:18:34,762 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2020-08-21 22:18:34,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:34,762 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2020-08-21 22:18:34,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 22:18:34,762 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2020-08-21 22:18:34,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 22:18:34,763 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:34,763 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:34,763 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 22:18:34,763 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:34,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:34,764 INFO L82 PathProgramCache]: Analyzing trace with hash 1537674631, now seen corresponding path program 37 times [2020-08-21 22:18:34,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:34,764 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1584774753] [2020-08-21 22:18:34,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:34,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:35,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:35,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:35,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:35,637 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1584774753] [2020-08-21 22:18:35,637 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:35,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 22:18:35,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303809136] [2020-08-21 22:18:35,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 22:18:35,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:35,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 22:18:35,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 22:18:35,639 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 41 states. [2020-08-21 22:18:35,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:35,894 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2020-08-21 22:18:35,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 22:18:35,894 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-08-21 22:18:35,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:35,895 INFO L225 Difference]: With dead ends: 96 [2020-08-21 22:18:35,896 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 22:18:35,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 22:18:35,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 22:18:35,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 22:18:35,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 22:18:35,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2020-08-21 22:18:35,899 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2020-08-21 22:18:35,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:35,900 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2020-08-21 22:18:35,900 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 22:18:35,900 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2020-08-21 22:18:35,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 22:18:35,901 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:35,901 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:35,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 22:18:35,901 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:35,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:35,902 INFO L82 PathProgramCache]: Analyzing trace with hash -604151127, now seen corresponding path program 38 times [2020-08-21 22:18:35,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:35,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1558028697] [2020-08-21 22:18:35,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:35,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:36,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:36,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:36,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:36,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1558028697] [2020-08-21 22:18:36,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:36,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 22:18:36,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815900637] [2020-08-21 22:18:36,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 22:18:36,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:36,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 22:18:36,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 22:18:36,828 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 42 states. [2020-08-21 22:18:37,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:37,117 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2020-08-21 22:18:37,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 22:18:37,117 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 88 [2020-08-21 22:18:37,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:37,118 INFO L225 Difference]: With dead ends: 98 [2020-08-21 22:18:37,119 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 22:18:37,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 22:18:37,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 22:18:37,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 22:18:37,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 22:18:37,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2020-08-21 22:18:37,127 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2020-08-21 22:18:37,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:37,128 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2020-08-21 22:18:37,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 22:18:37,128 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2020-08-21 22:18:37,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 22:18:37,129 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:37,129 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:37,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 22:18:37,129 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:37,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:37,130 INFO L82 PathProgramCache]: Analyzing trace with hash -1609369781, now seen corresponding path program 39 times [2020-08-21 22:18:37,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:37,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650109815] [2020-08-21 22:18:37,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:37,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:38,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:38,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:38,064 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:38,064 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650109815] [2020-08-21 22:18:38,064 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:38,064 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 22:18:38,064 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432397972] [2020-08-21 22:18:38,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 22:18:38,065 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:38,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 22:18:38,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 22:18:38,066 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 43 states. [2020-08-21 22:18:38,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:38,304 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2020-08-21 22:18:38,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 22:18:38,305 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 90 [2020-08-21 22:18:38,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:38,306 INFO L225 Difference]: With dead ends: 100 [2020-08-21 22:18:38,306 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 22:18:38,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 22:18:38,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 22:18:38,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 22:18:38,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 22:18:38,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2020-08-21 22:18:38,312 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2020-08-21 22:18:38,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:38,312 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2020-08-21 22:18:38,312 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 22:18:38,312 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2020-08-21 22:18:38,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 22:18:38,313 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:38,313 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:38,313 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 22:18:38,313 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:38,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:38,314 INFO L82 PathProgramCache]: Analyzing trace with hash -1256854675, now seen corresponding path program 40 times [2020-08-21 22:18:38,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:38,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [898166463] [2020-08-21 22:18:38,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:38,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:39,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:39,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:39,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:39,311 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [898166463] [2020-08-21 22:18:39,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:39,312 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 22:18:39,312 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541359375] [2020-08-21 22:18:39,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 22:18:39,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:39,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 22:18:39,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 22:18:39,313 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 44 states. [2020-08-21 22:18:39,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:39,517 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2020-08-21 22:18:39,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 22:18:39,517 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 92 [2020-08-21 22:18:39,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:39,518 INFO L225 Difference]: With dead ends: 102 [2020-08-21 22:18:39,518 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 22:18:39,519 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 22:18:39,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 22:18:39,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 22:18:39,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 22:18:39,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2020-08-21 22:18:39,524 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2020-08-21 22:18:39,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:39,524 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2020-08-21 22:18:39,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 22:18:39,525 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2020-08-21 22:18:39,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 22:18:39,526 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:39,526 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:39,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 22:18:39,526 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:39,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:39,527 INFO L82 PathProgramCache]: Analyzing trace with hash -1792254193, now seen corresponding path program 41 times [2020-08-21 22:18:39,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:39,527 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1044247836] [2020-08-21 22:18:39,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:39,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:40,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:40,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:40,591 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:40,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1044247836] [2020-08-21 22:18:40,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:40,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 22:18:40,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958009578] [2020-08-21 22:18:40,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 22:18:40,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:40,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 22:18:40,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 22:18:40,594 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 45 states. [2020-08-21 22:18:40,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:40,872 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2020-08-21 22:18:40,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 22:18:40,872 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 94 [2020-08-21 22:18:40,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:40,874 INFO L225 Difference]: With dead ends: 104 [2020-08-21 22:18:40,874 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 22:18:40,875 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 22:18:40,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 22:18:40,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 22:18:40,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 22:18:40,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2020-08-21 22:18:40,879 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2020-08-21 22:18:40,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:40,879 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2020-08-21 22:18:40,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 22:18:40,880 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2020-08-21 22:18:40,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 22:18:40,880 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:40,880 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:40,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 22:18:40,881 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:40,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:40,881 INFO L82 PathProgramCache]: Analyzing trace with hash -915115471, now seen corresponding path program 42 times [2020-08-21 22:18:40,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:40,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1926550181] [2020-08-21 22:18:40,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:40,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:41,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:41,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:41,970 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:41,970 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1926550181] [2020-08-21 22:18:41,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:41,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 22:18:41,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753743730] [2020-08-21 22:18:41,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 22:18:41,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:41,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 22:18:41,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 22:18:41,972 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 46 states. [2020-08-21 22:18:42,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:42,152 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2020-08-21 22:18:42,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 22:18:42,153 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 96 [2020-08-21 22:18:42,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:42,154 INFO L225 Difference]: With dead ends: 106 [2020-08-21 22:18:42,155 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 22:18:42,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 22:18:42,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 22:18:42,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 22:18:42,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 22:18:42,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2020-08-21 22:18:42,160 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2020-08-21 22:18:42,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:42,160 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2020-08-21 22:18:42,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 22:18:42,160 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2020-08-21 22:18:42,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 22:18:42,161 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:42,161 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:42,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 22:18:42,161 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:42,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:42,162 INFO L82 PathProgramCache]: Analyzing trace with hash 201606355, now seen corresponding path program 43 times [2020-08-21 22:18:42,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:42,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1507222211] [2020-08-21 22:18:42,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:42,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:43,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:43,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:43,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:43,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1507222211] [2020-08-21 22:18:43,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:43,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 22:18:43,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029448510] [2020-08-21 22:18:43,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 22:18:43,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:43,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 22:18:43,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 22:18:43,329 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 47 states. [2020-08-21 22:18:43,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:43,619 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2020-08-21 22:18:43,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 22:18:43,620 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 98 [2020-08-21 22:18:43,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:43,621 INFO L225 Difference]: With dead ends: 108 [2020-08-21 22:18:43,621 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 22:18:43,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 22:18:43,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 22:18:43,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 22:18:43,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 22:18:43,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2020-08-21 22:18:43,627 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2020-08-21 22:18:43,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:43,627 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2020-08-21 22:18:43,627 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 22:18:43,627 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2020-08-21 22:18:43,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 22:18:43,628 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:43,628 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:43,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 22:18:43,629 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:43,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:43,629 INFO L82 PathProgramCache]: Analyzing trace with hash -370542859, now seen corresponding path program 44 times [2020-08-21 22:18:43,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:43,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1499175121] [2020-08-21 22:18:43,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:43,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:44,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:44,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:44,823 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:44,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1499175121] [2020-08-21 22:18:44,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:44,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 22:18:44,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904076535] [2020-08-21 22:18:44,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 22:18:44,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:44,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 22:18:44,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 22:18:44,825 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 48 states. [2020-08-21 22:18:45,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:45,052 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2020-08-21 22:18:45,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 22:18:45,053 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 100 [2020-08-21 22:18:45,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:45,054 INFO L225 Difference]: With dead ends: 110 [2020-08-21 22:18:45,054 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 22:18:45,055 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 22:18:45,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 22:18:45,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 22:18:45,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 22:18:45,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-08-21 22:18:45,058 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2020-08-21 22:18:45,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:45,059 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-08-21 22:18:45,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 22:18:45,059 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-08-21 22:18:45,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 22:18:45,060 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:45,060 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:45,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 22:18:45,060 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:45,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:45,060 INFO L82 PathProgramCache]: Analyzing trace with hash -450123625, now seen corresponding path program 45 times [2020-08-21 22:18:45,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:45,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2132843796] [2020-08-21 22:18:45,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:45,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:46,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:46,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:46,277 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:46,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2132843796] [2020-08-21 22:18:46,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:46,278 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 22:18:46,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246882614] [2020-08-21 22:18:46,278 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 22:18:46,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:46,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 22:18:46,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 22:18:46,279 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 49 states. [2020-08-21 22:18:46,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:46,480 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2020-08-21 22:18:46,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 22:18:46,480 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 102 [2020-08-21 22:18:46,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:46,482 INFO L225 Difference]: With dead ends: 112 [2020-08-21 22:18:46,482 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 22:18:46,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 22:18:46,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 22:18:46,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 22:18:46,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 22:18:46,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-08-21 22:18:46,487 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2020-08-21 22:18:46,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:46,488 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-08-21 22:18:46,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 22:18:46,488 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-08-21 22:18:46,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-21 22:18:46,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:46,489 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:46,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 22:18:46,489 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:46,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:46,489 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 46 times [2020-08-21 22:18:46,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:46,490 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1331153626] [2020-08-21 22:18:46,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:46,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:47,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:47,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:47,855 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:47,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1331153626] [2020-08-21 22:18:47,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:47,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 22:18:47,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383908986] [2020-08-21 22:18:47,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 22:18:47,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:47,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 22:18:47,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 22:18:47,858 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 50 states. [2020-08-21 22:18:48,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:48,059 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2020-08-21 22:18:48,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-21 22:18:48,059 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2020-08-21 22:18:48,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:48,061 INFO L225 Difference]: With dead ends: 114 [2020-08-21 22:18:48,061 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 22:18:48,062 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 22:18:48,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 22:18:48,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 22:18:48,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 22:18:48,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-08-21 22:18:48,066 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2020-08-21 22:18:48,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:48,067 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-08-21 22:18:48,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-21 22:18:48,067 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-08-21 22:18:48,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-21 22:18:48,068 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:48,068 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:48,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-21 22:18:48,068 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:48,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:48,068 INFO L82 PathProgramCache]: Analyzing trace with hash 1353943643, now seen corresponding path program 47 times [2020-08-21 22:18:48,069 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:48,069 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [204393073] [2020-08-21 22:18:48,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:48,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:49,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:49,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:49,282 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:49,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [204393073] [2020-08-21 22:18:49,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:49,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-21 22:18:49,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864425255] [2020-08-21 22:18:49,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-21 22:18:49,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:49,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-21 22:18:49,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 22:18:49,284 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 51 states. [2020-08-21 22:18:49,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:49,491 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2020-08-21 22:18:49,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-21 22:18:49,491 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 106 [2020-08-21 22:18:49,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:49,492 INFO L225 Difference]: With dead ends: 116 [2020-08-21 22:18:49,492 INFO L226 Difference]: Without dead ends: 110 [2020-08-21 22:18:49,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 22:18:49,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-21 22:18:49,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-21 22:18:49,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-21 22:18:49,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2020-08-21 22:18:49,497 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2020-08-21 22:18:49,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:49,498 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2020-08-21 22:18:49,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-21 22:18:49,498 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2020-08-21 22:18:49,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-21 22:18:49,498 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:49,499 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:49,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-21 22:18:49,499 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:49,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:49,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1075971459, now seen corresponding path program 48 times [2020-08-21 22:18:49,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:49,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [774537330] [2020-08-21 22:18:49,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:49,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:50,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:50,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:50,911 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:50,912 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [774537330] [2020-08-21 22:18:50,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:50,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-08-21 22:18:50,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928307965] [2020-08-21 22:18:50,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-08-21 22:18:50,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:50,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-08-21 22:18:50,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-21 22:18:50,914 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 52 states. [2020-08-21 22:18:51,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:51,128 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2020-08-21 22:18:51,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-08-21 22:18:51,129 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 108 [2020-08-21 22:18:51,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:51,130 INFO L225 Difference]: With dead ends: 118 [2020-08-21 22:18:51,130 INFO L226 Difference]: Without dead ends: 112 [2020-08-21 22:18:51,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-21 22:18:51,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-21 22:18:51,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-21 22:18:51,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-21 22:18:51,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2020-08-21 22:18:51,135 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2020-08-21 22:18:51,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:51,136 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2020-08-21 22:18:51,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-08-21 22:18:51,136 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2020-08-21 22:18:51,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-21 22:18:51,136 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:51,137 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:51,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-21 22:18:51,137 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:51,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:51,137 INFO L82 PathProgramCache]: Analyzing trace with hash 237824543, now seen corresponding path program 49 times [2020-08-21 22:18:51,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:51,138 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [626118907] [2020-08-21 22:18:51,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:51,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:52,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:52,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:52,637 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:52,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [626118907] [2020-08-21 22:18:52,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:52,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-21 22:18:52,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577955602] [2020-08-21 22:18:52,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-21 22:18:52,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:52,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-21 22:18:52,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-21 22:18:52,639 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 53 states. [2020-08-21 22:18:52,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:52,915 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2020-08-21 22:18:52,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-08-21 22:18:52,915 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 110 [2020-08-21 22:18:52,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:52,917 INFO L225 Difference]: With dead ends: 120 [2020-08-21 22:18:52,918 INFO L226 Difference]: Without dead ends: 114 [2020-08-21 22:18:52,918 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-21 22:18:52,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-21 22:18:52,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-08-21 22:18:52,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-21 22:18:52,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2020-08-21 22:18:52,930 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2020-08-21 22:18:52,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:52,930 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2020-08-21 22:18:52,930 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-21 22:18:52,930 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2020-08-21 22:18:52,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-21 22:18:52,934 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:52,934 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:52,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-21 22:18:52,934 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:52,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:52,935 INFO L82 PathProgramCache]: Analyzing trace with hash 75397441, now seen corresponding path program 50 times [2020-08-21 22:18:52,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:52,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1881254012] [2020-08-21 22:18:52,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:52,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:54,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:54,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:54,516 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:54,517 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1881254012] [2020-08-21 22:18:54,517 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:54,517 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-08-21 22:18:54,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775137773] [2020-08-21 22:18:54,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-08-21 22:18:54,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:54,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-08-21 22:18:54,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-21 22:18:54,518 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 54 states. [2020-08-21 22:18:54,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:54,875 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2020-08-21 22:18:54,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-08-21 22:18:54,875 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 112 [2020-08-21 22:18:54,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:54,877 INFO L225 Difference]: With dead ends: 122 [2020-08-21 22:18:54,877 INFO L226 Difference]: Without dead ends: 116 [2020-08-21 22:18:54,878 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-21 22:18:54,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-08-21 22:18:54,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-08-21 22:18:54,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-21 22:18:54,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2020-08-21 22:18:54,882 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2020-08-21 22:18:54,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:54,883 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2020-08-21 22:18:54,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-08-21 22:18:54,883 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2020-08-21 22:18:54,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-21 22:18:54,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:54,884 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:54,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-21 22:18:54,884 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:54,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:54,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1398224925, now seen corresponding path program 51 times [2020-08-21 22:18:54,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:54,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261126642] [2020-08-21 22:18:54,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:54,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:56,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:56,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:56,468 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:56,468 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261126642] [2020-08-21 22:18:56,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:56,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-21 22:18:56,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925046846] [2020-08-21 22:18:56,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-21 22:18:56,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:56,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-21 22:18:56,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-21 22:18:56,469 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 55 states. [2020-08-21 22:18:56,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:56,801 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2020-08-21 22:18:56,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-08-21 22:18:56,802 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 114 [2020-08-21 22:18:56,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:56,803 INFO L225 Difference]: With dead ends: 124 [2020-08-21 22:18:56,803 INFO L226 Difference]: Without dead ends: 118 [2020-08-21 22:18:56,804 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-21 22:18:56,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-21 22:18:56,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2020-08-21 22:18:56,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-08-21 22:18:56,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2020-08-21 22:18:56,808 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2020-08-21 22:18:56,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:56,808 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2020-08-21 22:18:56,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-21 22:18:56,809 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2020-08-21 22:18:56,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-21 22:18:56,810 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:56,810 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:56,810 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-21 22:18:56,810 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:56,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:56,811 INFO L82 PathProgramCache]: Analyzing trace with hash -210110971, now seen corresponding path program 52 times [2020-08-21 22:18:56,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:56,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [447694124] [2020-08-21 22:18:56,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:56,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:58,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:58,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:58,542 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:58,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [447694124] [2020-08-21 22:18:58,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:58,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-08-21 22:18:58,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522644503] [2020-08-21 22:18:58,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-08-21 22:18:58,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:58,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-08-21 22:18:58,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-21 22:18:58,544 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 56 states. [2020-08-21 22:18:58,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:58,891 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2020-08-21 22:18:58,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-08-21 22:18:58,892 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2020-08-21 22:18:58,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:58,893 INFO L225 Difference]: With dead ends: 126 [2020-08-21 22:18:58,893 INFO L226 Difference]: Without dead ends: 120 [2020-08-21 22:18:58,894 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-21 22:18:58,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-08-21 22:18:58,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2020-08-21 22:18:58,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-21 22:18:58,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2020-08-21 22:18:58,899 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2020-08-21 22:18:58,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:58,900 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2020-08-21 22:18:58,900 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-08-21 22:18:58,900 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2020-08-21 22:18:58,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-21 22:18:58,900 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:58,901 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:58,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-21 22:18:58,901 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:58,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:58,901 INFO L82 PathProgramCache]: Analyzing trace with hash -893901913, now seen corresponding path program 53 times [2020-08-21 22:18:58,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:58,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1076998332] [2020-08-21 22:18:58,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:58,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:00,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:00,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:00,630 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:19:00,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1076998332] [2020-08-21 22:19:00,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:00,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-21 22:19:00,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565413509] [2020-08-21 22:19:00,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-21 22:19:00,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:00,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-21 22:19:00,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-21 22:19:00,632 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 57 states. [2020-08-21 22:19:00,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:00,915 INFO L93 Difference]: Finished difference Result 128 states and 128 transitions. [2020-08-21 22:19:00,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-08-21 22:19:00,916 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 118 [2020-08-21 22:19:00,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:00,917 INFO L225 Difference]: With dead ends: 128 [2020-08-21 22:19:00,917 INFO L226 Difference]: Without dead ends: 122 [2020-08-21 22:19:00,918 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-21 22:19:00,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-21 22:19:00,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2020-08-21 22:19:00,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-21 22:19:00,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2020-08-21 22:19:00,922 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 118 [2020-08-21 22:19:00,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:00,922 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2020-08-21 22:19:00,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-21 22:19:00,923 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2020-08-21 22:19:00,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-21 22:19:00,923 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:19:00,924 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:19:00,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-21 22:19:00,924 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:19:00,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:19:00,924 INFO L82 PathProgramCache]: Analyzing trace with hash -887000887, now seen corresponding path program 54 times [2020-08-21 22:19:00,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:19:00,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1603070139] [2020-08-21 22:19:00,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:19:00,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:02,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:02,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:02,608 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:19:02,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1603070139] [2020-08-21 22:19:02,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:02,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-08-21 22:19:02,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616140266] [2020-08-21 22:19:02,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-08-21 22:19:02,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:02,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-08-21 22:19:02,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-21 22:19:02,610 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 58 states. [2020-08-21 22:19:02,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:02,960 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2020-08-21 22:19:02,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-08-21 22:19:02,960 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 120 [2020-08-21 22:19:02,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:02,962 INFO L225 Difference]: With dead ends: 130 [2020-08-21 22:19:02,962 INFO L226 Difference]: Without dead ends: 124 [2020-08-21 22:19:02,962 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-21 22:19:02,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-21 22:19:02,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2020-08-21 22:19:02,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-08-21 22:19:02,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-08-21 22:19:02,967 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 120 [2020-08-21 22:19:02,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:02,967 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-08-21 22:19:02,967 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-08-21 22:19:02,967 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-08-21 22:19:02,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-21 22:19:02,968 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:19:02,968 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:19:02,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-21 22:19:02,968 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:19:02,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:19:02,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1449917803, now seen corresponding path program 55 times [2020-08-21 22:19:02,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:19:02,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547471652] [2020-08-21 22:19:02,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:19:02,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:04,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:04,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:04,835 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:19:04,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1547471652] [2020-08-21 22:19:04,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:04,836 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-08-21 22:19:04,836 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864703350] [2020-08-21 22:19:04,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-08-21 22:19:04,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:04,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-08-21 22:19:04,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-21 22:19:04,837 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 59 states. [2020-08-21 22:19:05,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:05,061 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2020-08-21 22:19:05,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-08-21 22:19:05,064 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 122 [2020-08-21 22:19:05,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:05,065 INFO L225 Difference]: With dead ends: 132 [2020-08-21 22:19:05,065 INFO L226 Difference]: Without dead ends: 126 [2020-08-21 22:19:05,065 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-21 22:19:05,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-21 22:19:05,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-08-21 22:19:05,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-21 22:19:05,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2020-08-21 22:19:05,068 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 122 [2020-08-21 22:19:05,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:05,069 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2020-08-21 22:19:05,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-08-21 22:19:05,069 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2020-08-21 22:19:05,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-21 22:19:05,070 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:19:05,070 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:19:05,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-21 22:19:05,070 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:19:05,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:19:05,071 INFO L82 PathProgramCache]: Analyzing trace with hash 960883085, now seen corresponding path program 56 times [2020-08-21 22:19:05,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:19:05,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [936321630] [2020-08-21 22:19:05,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:19:05,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:06,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:06,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:06,937 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:19:06,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [936321630] [2020-08-21 22:19:06,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:06,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-08-21 22:19:06,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557227403] [2020-08-21 22:19:06,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-08-21 22:19:06,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:06,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-08-21 22:19:06,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-21 22:19:06,939 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 60 states. [2020-08-21 22:19:07,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:07,323 INFO L93 Difference]: Finished difference Result 134 states and 134 transitions. [2020-08-21 22:19:07,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-08-21 22:19:07,324 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 124 [2020-08-21 22:19:07,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:07,325 INFO L225 Difference]: With dead ends: 134 [2020-08-21 22:19:07,326 INFO L226 Difference]: Without dead ends: 128 [2020-08-21 22:19:07,326 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-21 22:19:07,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-08-21 22:19:07,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2020-08-21 22:19:07,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-21 22:19:07,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2020-08-21 22:19:07,329 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 124 [2020-08-21 22:19:07,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:07,330 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2020-08-21 22:19:07,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-08-21 22:19:07,330 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2020-08-21 22:19:07,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-21 22:19:07,330 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:19:07,331 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:19:07,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-21 22:19:07,331 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:19:07,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:19:07,331 INFO L82 PathProgramCache]: Analyzing trace with hash -850045649, now seen corresponding path program 57 times [2020-08-21 22:19:07,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:19:07,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1388665343] [2020-08-21 22:19:07,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:19:07,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:09,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:09,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:09,340 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:19:09,340 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1388665343] [2020-08-21 22:19:09,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:09,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-08-21 22:19:09,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621819576] [2020-08-21 22:19:09,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-08-21 22:19:09,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:09,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-08-21 22:19:09,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-21 22:19:09,342 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 61 states. [2020-08-21 22:19:09,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:09,594 INFO L93 Difference]: Finished difference Result 136 states and 136 transitions. [2020-08-21 22:19:09,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-08-21 22:19:09,595 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 126 [2020-08-21 22:19:09,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:09,596 INFO L225 Difference]: With dead ends: 136 [2020-08-21 22:19:09,596 INFO L226 Difference]: Without dead ends: 130 [2020-08-21 22:19:09,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-21 22:19:09,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-21 22:19:09,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2020-08-21 22:19:09,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-08-21 22:19:09,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2020-08-21 22:19:09,601 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 126 [2020-08-21 22:19:09,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:09,601 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2020-08-21 22:19:09,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-08-21 22:19:09,601 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2020-08-21 22:19:09,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-08-21 22:19:09,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:19:09,602 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:19:09,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-21 22:19:09,602 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:19:09,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:19:09,603 INFO L82 PathProgramCache]: Analyzing trace with hash -1690804143, now seen corresponding path program 58 times [2020-08-21 22:19:09,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:19:09,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [811571325] [2020-08-21 22:19:09,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:19:09,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:11,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:11,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:11,657 INFO L134 CoverageAnalysis]: Checked inductivity of 3364 backedges. 0 proven. 3364 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:19:11,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [811571325] [2020-08-21 22:19:11,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:11,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2020-08-21 22:19:11,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578043932] [2020-08-21 22:19:11,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-08-21 22:19:11,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:11,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-08-21 22:19:11,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1832, Invalid=1950, Unknown=0, NotChecked=0, Total=3782 [2020-08-21 22:19:11,658 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 62 states. [2020-08-21 22:19:12,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:12,043 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2020-08-21 22:19:12,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-08-21 22:19:12,044 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 128 [2020-08-21 22:19:12,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:12,045 INFO L225 Difference]: With dead ends: 138 [2020-08-21 22:19:12,045 INFO L226 Difference]: Without dead ends: 132 [2020-08-21 22:19:12,046 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1832, Invalid=1950, Unknown=0, NotChecked=0, Total=3782 [2020-08-21 22:19:12,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-08-21 22:19:12,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2020-08-21 22:19:12,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2020-08-21 22:19:12,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 131 transitions. [2020-08-21 22:19:12,049 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 131 transitions. Word has length 128 [2020-08-21 22:19:12,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:12,050 INFO L479 AbstractCegarLoop]: Abstraction has 131 states and 131 transitions. [2020-08-21 22:19:12,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-08-21 22:19:12,050 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 131 transitions. [2020-08-21 22:19:12,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-08-21 22:19:12,051 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:19:12,051 INFO L422 BasicCegarLoop]: trace histogram [59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:19:12,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2020-08-21 22:19:12,051 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:19:12,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:19:12,051 INFO L82 PathProgramCache]: Analyzing trace with hash 2089102067, now seen corresponding path program 59 times [2020-08-21 22:19:12,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:19:12,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1325274428] [2020-08-21 22:19:12,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:19:12,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:14,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:14,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:14,180 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 0 proven. 3481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:19:14,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1325274428] [2020-08-21 22:19:14,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:14,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2020-08-21 22:19:14,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720192703] [2020-08-21 22:19:14,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2020-08-21 22:19:14,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:14,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2020-08-21 22:19:14,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1893, Invalid=2013, Unknown=0, NotChecked=0, Total=3906 [2020-08-21 22:19:14,181 INFO L87 Difference]: Start difference. First operand 131 states and 131 transitions. Second operand 63 states.