/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.6 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 00:43:16,885 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 00:43:16,887 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 00:43:16,910 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 00:43:16,911 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 00:43:16,912 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 00:43:16,913 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 00:43:16,915 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 00:43:16,916 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 00:43:16,917 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 00:43:16,918 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 00:43:16,919 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 00:43:16,919 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 00:43:16,920 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 00:43:16,921 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 00:43:16,922 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 00:43:16,923 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 00:43:16,924 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 00:43:16,925 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 00:43:16,927 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 00:43:16,928 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 00:43:16,929 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 00:43:16,930 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 00:43:16,931 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 00:43:16,934 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 00:43:16,941 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 00:43:16,942 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 00:43:16,942 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 00:43:16,943 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 [2020-08-22 00:43:16,988 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 00:43:16,989 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 00:43:16,990 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 00:43:16,990 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 00:43:16,990 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 00:43:16,991 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 00:43:16,991 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 00:43:16,991 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 00:43:16,991 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 00:43:16,991 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 00:43:16,992 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 00:43:16,992 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 00:43:16,992 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 00:43:16,992 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 00:43:16,992 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 00:43:16,992 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 00:43:16,993 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 00:43:16,994 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 00:43:16,994 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 00:43:16,995 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 00:43:16,995 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 00:43:16,995 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 00:43:16,996 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 00:43:16,996 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 00:43:16,996 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 00:43:16,996 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 00:43:16,996 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 00:43:16,996 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 00:43:16,997 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 00:43:16,997 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=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true; [2020-08-22 00:43:17,313 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 00:43:17,331 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 00:43:17,334 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 00:43:17,336 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 00:43:17,336 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 00:43:17,337 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-22 00:43:17,395 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f15db533e/b9874523e7014ca0b88bf671ad58cdee/FLAGd2c5c33aa [2020-08-22 00:43:17,837 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 00:43:17,838 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-22 00:43:17,844 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f15db533e/b9874523e7014ca0b88bf671ad58cdee/FLAGd2c5c33aa [2020-08-22 00:43:18,238 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f15db533e/b9874523e7014ca0b88bf671ad58cdee [2020-08-22 00:43:18,247 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 00:43:18,248 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 00:43:18,249 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 00:43:18,249 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 00:43:18,252 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 00:43:18,253 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 12:43:18" (1/1) ... [2020-08-22 00:43:18,256 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ec9a616 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:18, skipping insertion in model container [2020-08-22 00:43:18,256 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 12:43:18" (1/1) ... [2020-08-22 00:43:18,264 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 00:43:18,279 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 00:43:18,440 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 00:43:18,483 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 00:43:18,502 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 00:43:18,652 INFO L208 MainTranslator]: Completed translation [2020-08-22 00:43:18,653 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:18 WrapperNode [2020-08-22 00:43:18,653 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 00:43:18,654 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 00:43:18,654 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 00:43:18,654 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 00:43:18,665 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:18" (1/1) ... [2020-08-22 00:43:18,665 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:18" (1/1) ... [2020-08-22 00:43:18,675 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:18" (1/1) ... [2020-08-22 00:43:18,675 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:18" (1/1) ... [2020-08-22 00:43:18,697 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:18" (1/1) ... [2020-08-22 00:43:18,703 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:18" (1/1) ... [2020-08-22 00:43:18,705 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:18" (1/1) ... [2020-08-22 00:43:18,711 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 00:43:18,711 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 00:43:18,712 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 00:43:18,712 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 00:43:18,713 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:18" (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 [2020-08-22 00:43:18,765 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 00:43:18,765 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 00:43:18,765 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 00:43:18,765 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 00:43:18,766 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 00:43:18,766 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 00:43:18,766 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 00:43:18,766 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 00:43:18,766 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 00:43:18,766 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-22 00:43:18,767 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 00:43:18,767 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 00:43:19,004 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 00:43:19,004 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-22 00:43:19,010 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 12:43:19 BoogieIcfgContainer [2020-08-22 00:43:19,010 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 00:43:19,011 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 00:43:19,012 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 00:43:19,015 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 00:43:19,015 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 12:43:18" (1/3) ... [2020-08-22 00:43:19,016 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4220549c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 12:43:19, skipping insertion in model container [2020-08-22 00:43:19,016 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:43:18" (2/3) ... [2020-08-22 00:43:19,016 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4220549c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 12:43:19, skipping insertion in model container [2020-08-22 00:43:19,016 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 12:43:19" (3/3) ... [2020-08-22 00:43:19,018 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-22 00:43:19,030 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 00:43:19,038 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 00:43:19,056 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 00:43:19,081 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 00:43:19,082 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 00:43:19,082 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 00:43:19,082 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 00:43:19,082 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 00:43:19,083 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 00:43:19,083 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 00:43:19,083 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 00:43:19,104 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-22 00:43:19,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-22 00:43:19,115 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:19,117 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:19,117 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:19,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:19,123 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-22 00:43:19,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:19,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1293070777] [2020-08-22 00:43:19,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:19,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:19,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:19,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:19,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:19,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1293070777] [2020-08-22 00:43:19,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 00:43:19,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 00:43:19,326 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882938995] [2020-08-22 00:43:19,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 00:43:19,331 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:19,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 00:43:19,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 00:43:19,348 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-22 00:43:19,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:19,438 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-22 00:43:19,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 00:43:19,440 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-22 00:43:19,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:19,450 INFO L225 Difference]: With dead ends: 42 [2020-08-22 00:43:19,450 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 00:43:19,454 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 [2020-08-22 00:43:19,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 00:43:19,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-22 00:43:19,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 00:43:19,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-22 00:43:19,492 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-22 00:43:19,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:19,493 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-22 00:43:19,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 00:43:19,493 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-22 00:43:19,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-22 00:43:19,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:19,494 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:19,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 00:43:19,495 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:19,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:19,495 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-22 00:43:19,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:19,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [798063544] [2020-08-22 00:43:19,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:19,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:19,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:19,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:19,594 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:19,595 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [798063544] [2020-08-22 00:43:19,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 00:43:19,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 00:43:19,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690902911] [2020-08-22 00:43:19,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 00:43:19,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:19,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 00:43:19,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 00:43:19,598 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-22 00:43:19,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:19,694 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-22 00:43:19,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 00:43:19,695 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-22 00:43:19,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:19,696 INFO L225 Difference]: With dead ends: 36 [2020-08-22 00:43:19,696 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 00:43:19,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 00:43:19,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 00:43:19,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-22 00:43:19,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 00:43:19,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-22 00:43:19,705 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-22 00:43:19,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:19,705 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-22 00:43:19,705 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 00:43:19,705 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-22 00:43:19,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 00:43:19,706 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:19,706 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:19,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 00:43:19,707 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:19,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:19,707 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-22 00:43:19,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:19,708 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [534841402] [2020-08-22 00:43:19,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:19,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:19,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:19,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:19,791 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:19,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [534841402] [2020-08-22 00:43:19,791 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 00:43:19,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 00:43:19,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260352338] [2020-08-22 00:43:19,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 00:43:19,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:19,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 00:43:19,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 00:43:19,793 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-22 00:43:19,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:19,884 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-22 00:43:19,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 00:43:19,885 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-22 00:43:19,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:19,886 INFO L225 Difference]: With dead ends: 40 [2020-08-22 00:43:19,886 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 00:43:19,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 00:43:19,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 00:43:19,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-22 00:43:19,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 00:43:19,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-22 00:43:19,894 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-22 00:43:19,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:19,894 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-22 00:43:19,894 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 00:43:19,895 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-22 00:43:19,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 00:43:19,895 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:19,896 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:19,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 00:43:19,896 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:19,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:19,897 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-22 00:43:19,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:19,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1382129153] [2020-08-22 00:43:19,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:19,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:19,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:19,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:19,963 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:19,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1382129153] [2020-08-22 00:43:19,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 00:43:19,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 00:43:19,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568119164] [2020-08-22 00:43:19,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 00:43:19,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:19,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 00:43:19,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 00:43:19,966 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-22 00:43:20,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:20,035 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-22 00:43:20,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 00:43:20,035 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-22 00:43:20,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:20,036 INFO L225 Difference]: With dead ends: 31 [2020-08-22 00:43:20,037 INFO L226 Difference]: Without dead ends: 21 [2020-08-22 00:43:20,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 00:43:20,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-22 00:43:20,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-22 00:43:20,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-22 00:43:20,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-22 00:43:20,043 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-22 00:43:20,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:20,044 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-22 00:43:20,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 00:43:20,044 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-22 00:43:20,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 00:43:20,045 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:20,045 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:20,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 00:43:20,046 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:20,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:20,046 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-22 00:43:20,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:20,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1481177402] [2020-08-22 00:43:20,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:20,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:20,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:20,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:20,156 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:20,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1481177402] [2020-08-22 00:43:20,157 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:20,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-22 00:43:20,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550750987] [2020-08-22 00:43:20,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 00:43:20,158 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:20,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 00:43:20,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-22 00:43:20,159 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-22 00:43:20,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:20,237 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-22 00:43:20,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 00:43:20,237 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-22 00:43:20,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:20,238 INFO L225 Difference]: With dead ends: 34 [2020-08-22 00:43:20,239 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 00:43:20,239 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-22 00:43:20,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 00:43:20,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-22 00:43:20,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 00:43:20,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-22 00:43:20,246 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-22 00:43:20,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:20,247 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-22 00:43:20,247 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 00:43:20,247 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-22 00:43:20,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 00:43:20,248 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:20,248 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:20,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 00:43:20,249 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:20,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:20,249 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-22 00:43:20,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:20,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1370124049] [2020-08-22 00:43:20,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:20,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:20,369 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:20,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:20,375 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:20,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1370124049] [2020-08-22 00:43:20,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:20,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 00:43:20,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654351542] [2020-08-22 00:43:20,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 00:43:20,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:20,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 00:43:20,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 00:43:20,378 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-22 00:43:20,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:20,456 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-22 00:43:20,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 00:43:20,457 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-22 00:43:20,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:20,458 INFO L225 Difference]: With dead ends: 38 [2020-08-22 00:43:20,458 INFO L226 Difference]: Without dead ends: 25 [2020-08-22 00:43:20,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-22 00:43:20,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-22 00:43:20,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-22 00:43:20,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-22 00:43:20,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-22 00:43:20,464 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-22 00:43:20,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:20,464 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-22 00:43:20,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 00:43:20,464 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-22 00:43:20,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 00:43:20,465 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:20,465 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:20,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 00:43:20,466 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:20,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:20,466 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-22 00:43:20,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:20,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1362736862] [2020-08-22 00:43:20,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:20,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:20,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:20,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:20,602 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:20,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1362736862] [2020-08-22 00:43:20,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:20,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 00:43:20,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872215544] [2020-08-22 00:43:20,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 00:43:20,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:20,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 00:43:20,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-22 00:43:20,605 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-22 00:43:20,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:20,725 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-22 00:43:20,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 00:43:20,726 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-22 00:43:20,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:20,726 INFO L225 Difference]: With dead ends: 42 [2020-08-22 00:43:20,727 INFO L226 Difference]: Without dead ends: 27 [2020-08-22 00:43:20,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-22 00:43:20,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-22 00:43:20,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-22 00:43:20,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-22 00:43:20,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-22 00:43:20,733 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-22 00:43:20,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:20,733 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-22 00:43:20,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 00:43:20,734 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-22 00:43:20,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-22 00:43:20,734 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:20,734 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:20,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 00:43:20,735 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:20,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:20,736 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-22 00:43:20,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:20,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1524509666] [2020-08-22 00:43:20,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:20,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:20,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:20,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:20,881 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:20,881 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1524509666] [2020-08-22 00:43:20,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:20,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 00:43:20,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633637747] [2020-08-22 00:43:20,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 00:43:20,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:20,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 00:43:20,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 00:43:20,885 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-22 00:43:21,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:21,013 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-22 00:43:21,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 00:43:21,013 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-22 00:43:21,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:21,014 INFO L225 Difference]: With dead ends: 46 [2020-08-22 00:43:21,014 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 00:43:21,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-22 00:43:21,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 00:43:21,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-22 00:43:21,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 00:43:21,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-22 00:43:21,022 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-22 00:43:21,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:21,023 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-22 00:43:21,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 00:43:21,023 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-22 00:43:21,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 00:43:21,025 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:21,025 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:21,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 00:43:21,025 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:21,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:21,026 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-22 00:43:21,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:21,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [395128768] [2020-08-22 00:43:21,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:21,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:21,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:21,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:21,208 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:21,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [395128768] [2020-08-22 00:43:21,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:21,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 00:43:21,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55304002] [2020-08-22 00:43:21,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 00:43:21,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:21,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 00:43:21,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-22 00:43:21,211 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-22 00:43:21,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:21,348 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-22 00:43:21,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 00:43:21,348 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-22 00:43:21,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:21,349 INFO L225 Difference]: With dead ends: 50 [2020-08-22 00:43:21,349 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 00:43:21,350 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-22 00:43:21,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 00:43:21,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-22 00:43:21,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 00:43:21,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-22 00:43:21,360 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-22 00:43:21,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:21,361 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-22 00:43:21,361 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 00:43:21,361 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-22 00:43:21,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 00:43:21,362 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:21,362 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:21,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 00:43:21,364 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:21,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:21,365 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-22 00:43:21,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:21,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [233752607] [2020-08-22 00:43:21,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:21,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:21,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:21,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:21,563 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:21,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [233752607] [2020-08-22 00:43:21,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:21,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 00:43:21,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070832449] [2020-08-22 00:43:21,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 00:43:21,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:21,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 00:43:21,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-22 00:43:21,566 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-22 00:43:21,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:21,737 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-22 00:43:21,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 00:43:21,738 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-22 00:43:21,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:21,741 INFO L225 Difference]: With dead ends: 54 [2020-08-22 00:43:21,741 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 00:43:21,742 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-22 00:43:21,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 00:43:21,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-22 00:43:21,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 00:43:21,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-22 00:43:21,749 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-22 00:43:21,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:21,750 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-22 00:43:21,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 00:43:21,751 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-22 00:43:21,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 00:43:21,754 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:21,754 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:21,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 00:43:21,755 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:21,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:21,755 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-22 00:43:21,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:21,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1573434854] [2020-08-22 00:43:21,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:21,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:21,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:21,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:21,960 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:21,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1573434854] [2020-08-22 00:43:21,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:21,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 00:43:21,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107705576] [2020-08-22 00:43:21,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 00:43:21,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:21,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 00:43:21,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-22 00:43:21,964 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-22 00:43:22,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:22,154 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-22 00:43:22,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 00:43:22,154 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-22 00:43:22,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:22,155 INFO L225 Difference]: With dead ends: 58 [2020-08-22 00:43:22,155 INFO L226 Difference]: Without dead ends: 35 [2020-08-22 00:43:22,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-08-22 00:43:22,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-22 00:43:22,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-22 00:43:22,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 00:43:22,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-22 00:43:22,166 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-22 00:43:22,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:22,166 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-22 00:43:22,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 00:43:22,167 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-22 00:43:22,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 00:43:22,168 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:22,168 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:22,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 00:43:22,169 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:22,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:22,169 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-22 00:43:22,170 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:22,170 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1262726175] [2020-08-22 00:43:22,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:22,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:22,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:22,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:22,374 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:22,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1262726175] [2020-08-22 00:43:22,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:22,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 00:43:22,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127712303] [2020-08-22 00:43:22,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 00:43:22,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:22,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 00:43:22,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-22 00:43:22,376 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-22 00:43:22,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:22,600 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-22 00:43:22,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 00:43:22,600 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-22 00:43:22,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:22,601 INFO L225 Difference]: With dead ends: 62 [2020-08-22 00:43:22,601 INFO L226 Difference]: Without dead ends: 37 [2020-08-22 00:43:22,602 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-22 00:43:22,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-22 00:43:22,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-22 00:43:22,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 00:43:22,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-22 00:43:22,607 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-22 00:43:22,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:22,608 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-22 00:43:22,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 00:43:22,608 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-22 00:43:22,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 00:43:22,609 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:22,609 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:22,609 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 00:43:22,609 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:22,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:22,610 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-22 00:43:22,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:22,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1468972337] [2020-08-22 00:43:22,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:22,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:22,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:22,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:22,806 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:22,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1468972337] [2020-08-22 00:43:22,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:22,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 00:43:22,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335672789] [2020-08-22 00:43:22,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 00:43:22,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:22,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 00:43:22,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-22 00:43:22,809 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-22 00:43:23,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:23,041 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-22 00:43:23,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 00:43:23,041 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-22 00:43:23,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:23,042 INFO L225 Difference]: With dead ends: 66 [2020-08-22 00:43:23,042 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 00:43:23,043 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-22 00:43:23,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 00:43:23,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-22 00:43:23,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-22 00:43:23,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-22 00:43:23,049 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-22 00:43:23,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:23,050 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-22 00:43:23,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 00:43:23,050 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-22 00:43:23,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-22 00:43:23,050 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:23,051 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:23,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 00:43:23,051 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:23,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:23,051 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-22 00:43:23,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:23,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1477049860] [2020-08-22 00:43:23,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:23,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:23,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:23,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:23,278 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:23,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1477049860] [2020-08-22 00:43:23,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:23,278 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 00:43:23,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433743746] [2020-08-22 00:43:23,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 00:43:23,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:23,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 00:43:23,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-22 00:43:23,280 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-22 00:43:23,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:23,541 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-22 00:43:23,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 00:43:23,541 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-22 00:43:23,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:23,542 INFO L225 Difference]: With dead ends: 70 [2020-08-22 00:43:23,542 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 00:43:23,543 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-22 00:43:23,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 00:43:23,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-22 00:43:23,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 00:43:23,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-22 00:43:23,548 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-22 00:43:23,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:23,548 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-22 00:43:23,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 00:43:23,549 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-22 00:43:23,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 00:43:23,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:23,550 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:23,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 00:43:23,550 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:23,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:23,550 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-22 00:43:23,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:23,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2145487611] [2020-08-22 00:43:23,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:23,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:23,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:23,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:23,797 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:23,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2145487611] [2020-08-22 00:43:23,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:23,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 00:43:23,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281120025] [2020-08-22 00:43:23,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 00:43:23,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:23,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 00:43:23,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-22 00:43:23,799 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-22 00:43:24,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:24,125 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-22 00:43:24,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 00:43:24,127 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-22 00:43:24,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:24,128 INFO L225 Difference]: With dead ends: 74 [2020-08-22 00:43:24,128 INFO L226 Difference]: Without dead ends: 43 [2020-08-22 00:43:24,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-22 00:43:24,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-22 00:43:24,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-22 00:43:24,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-22 00:43:24,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-22 00:43:24,135 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-22 00:43:24,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:24,135 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-22 00:43:24,135 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 00:43:24,136 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-22 00:43:24,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-22 00:43:24,136 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:24,137 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:24,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 00:43:24,137 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:24,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:24,138 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-22 00:43:24,138 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:24,138 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006635555] [2020-08-22 00:43:24,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:24,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:24,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:24,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:24,408 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:24,408 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006635555] [2020-08-22 00:43:24,409 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:24,409 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 00:43:24,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123043614] [2020-08-22 00:43:24,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 00:43:24,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:24,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 00:43:24,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-22 00:43:24,410 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-22 00:43:24,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:24,798 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-22 00:43:24,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 00:43:24,799 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-22 00:43:24,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:24,799 INFO L225 Difference]: With dead ends: 78 [2020-08-22 00:43:24,799 INFO L226 Difference]: Without dead ends: 45 [2020-08-22 00:43:24,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-08-22 00:43:24,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-22 00:43:24,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-22 00:43:24,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 00:43:24,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-22 00:43:24,806 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-22 00:43:24,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:24,806 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-22 00:43:24,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 00:43:24,806 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-22 00:43:24,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 00:43:24,807 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:24,807 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:24,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 00:43:24,808 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:24,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:24,808 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-22 00:43:24,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:24,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1980171266] [2020-08-22 00:43:24,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:24,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:25,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:25,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:25,106 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:25,106 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1980171266] [2020-08-22 00:43:25,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:25,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 00:43:25,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585630224] [2020-08-22 00:43:25,108 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 00:43:25,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:25,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 00:43:25,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-22 00:43:25,108 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-22 00:43:25,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:25,549 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-22 00:43:25,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 00:43:25,550 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-22 00:43:25,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:25,551 INFO L225 Difference]: With dead ends: 82 [2020-08-22 00:43:25,551 INFO L226 Difference]: Without dead ends: 47 [2020-08-22 00:43:25,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-22 00:43:25,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-22 00:43:25,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-22 00:43:25,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 00:43:25,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-22 00:43:25,560 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-22 00:43:25,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:25,561 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-22 00:43:25,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 00:43:25,562 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-22 00:43:25,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 00:43:25,562 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:25,562 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:25,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-22 00:43:25,563 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:25,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:25,563 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-22 00:43:25,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:25,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [326874686] [2020-08-22 00:43:25,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:25,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:25,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:25,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:25,900 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:25,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [326874686] [2020-08-22 00:43:25,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:25,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 00:43:25,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381410054] [2020-08-22 00:43:25,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 00:43:25,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:25,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 00:43:25,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-22 00:43:25,902 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-22 00:43:26,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:26,394 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-22 00:43:26,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 00:43:26,395 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-22 00:43:26,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:26,396 INFO L225 Difference]: With dead ends: 86 [2020-08-22 00:43:26,396 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 00:43:26,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-22 00:43:26,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 00:43:26,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-22 00:43:26,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 00:43:26,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-22 00:43:26,402 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-22 00:43:26,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:26,402 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-22 00:43:26,402 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 00:43:26,403 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-22 00:43:26,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-22 00:43:26,403 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:26,403 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:26,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-22 00:43:26,404 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:26,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:26,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-22 00:43:26,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:26,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104005154] [2020-08-22 00:43:26,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:26,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:26,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:26,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:26,738 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:26,738 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104005154] [2020-08-22 00:43:26,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:26,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 00:43:26,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282094272] [2020-08-22 00:43:26,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 00:43:26,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:26,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 00:43:26,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-22 00:43:26,740 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-22 00:43:27,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:27,284 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-22 00:43:27,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 00:43:27,284 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-22 00:43:27,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:27,285 INFO L225 Difference]: With dead ends: 90 [2020-08-22 00:43:27,285 INFO L226 Difference]: Without dead ends: 51 [2020-08-22 00:43:27,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-22 00:43:27,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-22 00:43:27,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-22 00:43:27,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-22 00:43:27,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-22 00:43:27,297 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-22 00:43:27,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:27,297 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-22 00:43:27,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 00:43:27,298 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-22 00:43:27,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-22 00:43:27,299 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:27,301 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:27,301 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-22 00:43:27,301 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:27,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:27,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-22 00:43:27,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:27,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [131559650] [2020-08-22 00:43:27,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:27,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:27,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:27,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:27,706 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:27,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [131559650] [2020-08-22 00:43:27,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:27,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 00:43:27,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151795069] [2020-08-22 00:43:27,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 00:43:27,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:27,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 00:43:27,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-22 00:43:27,709 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-22 00:43:28,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:28,225 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-22 00:43:28,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 00:43:28,226 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-22 00:43:28,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:28,227 INFO L225 Difference]: With dead ends: 94 [2020-08-22 00:43:28,227 INFO L226 Difference]: Without dead ends: 53 [2020-08-22 00:43:28,229 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-22 00:43:28,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-22 00:43:28,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-22 00:43:28,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-22 00:43:28,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-22 00:43:28,233 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-22 00:43:28,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:28,234 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-22 00:43:28,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 00:43:28,234 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-22 00:43:28,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-22 00:43:28,235 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:28,235 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:28,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-22 00:43:28,235 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:28,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:28,236 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-22 00:43:28,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:28,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1058224267] [2020-08-22 00:43:28,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:28,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:28,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:28,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:28,617 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:28,618 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1058224267] [2020-08-22 00:43:28,618 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:28,618 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 00:43:28,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378831698] [2020-08-22 00:43:28,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 00:43:28,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:28,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 00:43:28,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-22 00:43:28,620 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-22 00:43:29,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:29,187 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-22 00:43:29,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 00:43:29,187 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-22 00:43:29,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:29,188 INFO L225 Difference]: With dead ends: 98 [2020-08-22 00:43:29,188 INFO L226 Difference]: Without dead ends: 55 [2020-08-22 00:43:29,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-08-22 00:43:29,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-22 00:43:29,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-22 00:43:29,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-22 00:43:29,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-22 00:43:29,198 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-22 00:43:29,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:29,199 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-22 00:43:29,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 00:43:29,199 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-22 00:43:29,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-22 00:43:29,199 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:29,199 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:29,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-22 00:43:29,203 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:29,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:29,203 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-22 00:43:29,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:29,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1372222065] [2020-08-22 00:43:29,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:29,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:29,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:29,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:29,667 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:29,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1372222065] [2020-08-22 00:43:29,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:29,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 00:43:29,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874414597] [2020-08-22 00:43:29,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 00:43:29,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:29,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 00:43:29,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-22 00:43:29,669 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-22 00:43:30,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:30,304 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-22 00:43:30,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 00:43:30,307 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-22 00:43:30,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:30,308 INFO L225 Difference]: With dead ends: 102 [2020-08-22 00:43:30,308 INFO L226 Difference]: Without dead ends: 57 [2020-08-22 00:43:30,309 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-22 00:43:30,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-22 00:43:30,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-22 00:43:30,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-22 00:43:30,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-22 00:43:30,320 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-22 00:43:30,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:30,320 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-22 00:43:30,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 00:43:30,320 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-22 00:43:30,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-22 00:43:30,323 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:30,323 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:30,323 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 00:43:30,323 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:30,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:30,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-22 00:43:30,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:30,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1674166373] [2020-08-22 00:43:30,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:30,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:30,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:30,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:30,770 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:30,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1674166373] [2020-08-22 00:43:30,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:30,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 00:43:30,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135545555] [2020-08-22 00:43:30,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 00:43:30,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:30,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 00:43:30,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-22 00:43:30,772 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-22 00:43:31,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:31,490 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-22 00:43:31,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-22 00:43:31,492 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-22 00:43:31,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:31,493 INFO L225 Difference]: With dead ends: 106 [2020-08-22 00:43:31,493 INFO L226 Difference]: Without dead ends: 59 [2020-08-22 00:43:31,494 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-22 00:43:31,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-22 00:43:31,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-22 00:43:31,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-22 00:43:31,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-22 00:43:31,499 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-22 00:43:31,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:31,499 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-22 00:43:31,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 00:43:31,499 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-22 00:43:31,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-22 00:43:31,500 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:31,500 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:31,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-22 00:43:31,500 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:31,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:31,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-22 00:43:31,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:31,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1036764816] [2020-08-22 00:43:31,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:31,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:31,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:31,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:31,991 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:31,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1036764816] [2020-08-22 00:43:31,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:31,992 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-22 00:43:31,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672318434] [2020-08-22 00:43:31,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 00:43:31,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:31,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 00:43:31,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-22 00:43:31,993 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-22 00:43:32,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:32,733 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-22 00:43:32,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 00:43:32,736 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-22 00:43:32,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:32,737 INFO L225 Difference]: With dead ends: 110 [2020-08-22 00:43:32,737 INFO L226 Difference]: Without dead ends: 61 [2020-08-22 00:43:32,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2020-08-22 00:43:32,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-22 00:43:32,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-22 00:43:32,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-22 00:43:32,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-22 00:43:32,743 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-22 00:43:32,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:32,743 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-22 00:43:32,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 00:43:32,743 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-22 00:43:32,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-22 00:43:32,744 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:32,744 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:32,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-22 00:43:32,744 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:32,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:32,745 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-22 00:43:32,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:32,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [863679333] [2020-08-22 00:43:32,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:32,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:33,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:33,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:33,266 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:33,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [863679333] [2020-08-22 00:43:33,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:33,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 00:43:33,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161928624] [2020-08-22 00:43:33,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 00:43:33,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:33,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 00:43:33,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-22 00:43:33,268 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-22 00:43:34,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:34,072 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-22 00:43:34,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-22 00:43:34,073 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-22 00:43:34,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:34,074 INFO L225 Difference]: With dead ends: 114 [2020-08-22 00:43:34,074 INFO L226 Difference]: Without dead ends: 63 [2020-08-22 00:43:34,075 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-08-22 00:43:34,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-22 00:43:34,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-22 00:43:34,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-22 00:43:34,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-22 00:43:34,080 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-22 00:43:34,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:34,081 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-22 00:43:34,081 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 00:43:34,081 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-22 00:43:34,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-22 00:43:34,081 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:34,081 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:34,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-22 00:43:34,082 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:34,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:34,082 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-22 00:43:34,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:34,083 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1158775368] [2020-08-22 00:43:34,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:34,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:34,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:34,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:34,647 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:34,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1158775368] [2020-08-22 00:43:34,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:34,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-22 00:43:34,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287413936] [2020-08-22 00:43:34,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-22 00:43:34,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:34,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-22 00:43:34,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-22 00:43:34,649 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-22 00:43:35,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:35,575 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-22 00:43:35,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-22 00:43:35,576 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-22 00:43:35,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:35,577 INFO L225 Difference]: With dead ends: 118 [2020-08-22 00:43:35,577 INFO L226 Difference]: Without dead ends: 65 [2020-08-22 00:43:35,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2020-08-22 00:43:35,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-22 00:43:35,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-22 00:43:35,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-22 00:43:35,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-22 00:43:35,585 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-22 00:43:35,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:35,585 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-22 00:43:35,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-22 00:43:35,586 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-22 00:43:35,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-22 00:43:35,586 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:35,586 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:35,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-22 00:43:35,587 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:35,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:35,587 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-22 00:43:35,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:35,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1451761778] [2020-08-22 00:43:35,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:35,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:36,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:36,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:36,154 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:36,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1451761778] [2020-08-22 00:43:36,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:36,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-22 00:43:36,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649635799] [2020-08-22 00:43:36,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-22 00:43:36,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:36,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-22 00:43:36,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-22 00:43:36,157 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-22 00:43:37,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:37,110 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-22 00:43:37,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-22 00:43:37,110 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-22 00:43:37,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:37,111 INFO L225 Difference]: With dead ends: 122 [2020-08-22 00:43:37,111 INFO L226 Difference]: Without dead ends: 67 [2020-08-22 00:43:37,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-08-22 00:43:37,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-22 00:43:37,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-22 00:43:37,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-22 00:43:37,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-22 00:43:37,117 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-22 00:43:37,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:37,117 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-22 00:43:37,117 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-22 00:43:37,117 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-22 00:43:37,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-22 00:43:37,118 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:37,118 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:37,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-22 00:43:37,118 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:37,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:37,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-22 00:43:37,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:37,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [254753667] [2020-08-22 00:43:37,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:37,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:37,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:37,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:37,816 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:37,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [254753667] [2020-08-22 00:43:37,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:37,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-22 00:43:37,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780216307] [2020-08-22 00:43:37,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-22 00:43:37,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:37,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-22 00:43:37,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-22 00:43:37,819 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-22 00:43:38,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:38,925 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-22 00:43:38,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-22 00:43:38,930 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-22 00:43:38,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:38,931 INFO L225 Difference]: With dead ends: 126 [2020-08-22 00:43:38,931 INFO L226 Difference]: Without dead ends: 69 [2020-08-22 00:43:38,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-22 00:43:38,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-22 00:43:38,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-22 00:43:38,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-22 00:43:38,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-22 00:43:38,937 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-22 00:43:38,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:38,937 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-22 00:43:38,937 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-22 00:43:38,937 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-22 00:43:38,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-22 00:43:38,938 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:38,938 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:38,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-22 00:43:38,938 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:38,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:38,939 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-22 00:43:38,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:38,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352320605] [2020-08-22 00:43:38,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:38,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:39,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:39,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:39,781 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:39,781 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352320605] [2020-08-22 00:43:39,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:39,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 00:43:39,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557436885] [2020-08-22 00:43:39,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 00:43:39,782 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:39,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 00:43:39,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-22 00:43:39,783 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-22 00:43:41,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:41,254 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-22 00:43:41,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-22 00:43:41,258 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-22 00:43:41,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:41,259 INFO L225 Difference]: With dead ends: 130 [2020-08-22 00:43:41,259 INFO L226 Difference]: Without dead ends: 71 [2020-08-22 00:43:41,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-22 00:43:41,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-22 00:43:41,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-22 00:43:41,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-22 00:43:41,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-22 00:43:41,265 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-22 00:43:41,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:41,265 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-22 00:43:41,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-22 00:43:41,265 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-22 00:43:41,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-22 00:43:41,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:41,266 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:41,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-22 00:43:41,266 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:41,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:41,266 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-22 00:43:41,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:41,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [619845564] [2020-08-22 00:43:41,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:41,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:42,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:42,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:42,014 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:42,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [619845564] [2020-08-22 00:43:42,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:42,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-22 00:43:42,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315405778] [2020-08-22 00:43:42,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-22 00:43:42,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:42,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-22 00:43:42,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-22 00:43:42,017 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-22 00:43:43,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:43,267 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-22 00:43:43,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-22 00:43:43,267 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-22 00:43:43,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:43,268 INFO L225 Difference]: With dead ends: 134 [2020-08-22 00:43:43,268 INFO L226 Difference]: Without dead ends: 73 [2020-08-22 00:43:43,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-22 00:43:43,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-22 00:43:43,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-22 00:43:43,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-22 00:43:43,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-22 00:43:43,275 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-22 00:43:43,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:43,275 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-22 00:43:43,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-22 00:43:43,276 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-22 00:43:43,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-22 00:43:43,276 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:43,276 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:43,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-22 00:43:43,277 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:43,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:43,277 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-22 00:43:43,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:43,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [100504928] [2020-08-22 00:43:43,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:43,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:44,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:44,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:44,097 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:44,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [100504928] [2020-08-22 00:43:44,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:44,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-22 00:43:44,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383078155] [2020-08-22 00:43:44,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-22 00:43:44,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:44,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-22 00:43:44,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-22 00:43:44,100 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-22 00:43:45,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:45,381 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-22 00:43:45,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-22 00:43:45,381 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-22 00:43:45,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:45,382 INFO L225 Difference]: With dead ends: 138 [2020-08-22 00:43:45,383 INFO L226 Difference]: Without dead ends: 75 [2020-08-22 00:43:45,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-22 00:43:45,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-22 00:43:45,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-22 00:43:45,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-22 00:43:45,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-22 00:43:45,389 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-22 00:43:45,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:45,389 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-22 00:43:45,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-22 00:43:45,389 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-22 00:43:45,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-22 00:43:45,390 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:45,390 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:45,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-22 00:43:45,390 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:45,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:45,391 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-22 00:43:45,391 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:45,391 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2047293449] [2020-08-22 00:43:45,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:45,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:46,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:46,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:46,222 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:46,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2047293449] [2020-08-22 00:43:46,223 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:46,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-22 00:43:46,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130798722] [2020-08-22 00:43:46,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-22 00:43:46,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:46,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-22 00:43:46,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-22 00:43:46,225 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-22 00:43:47,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:47,657 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-22 00:43:47,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-22 00:43:47,657 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-22 00:43:47,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:47,659 INFO L225 Difference]: With dead ends: 142 [2020-08-22 00:43:47,659 INFO L226 Difference]: Without dead ends: 77 [2020-08-22 00:43:47,659 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 00:43:47,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-22 00:43:47,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-22 00:43:47,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-22 00:43:47,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-22 00:43:47,664 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-22 00:43:47,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:47,664 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-22 00:43:47,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-22 00:43:47,664 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-22 00:43:47,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-22 00:43:47,665 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:47,665 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:47,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-22 00:43:47,665 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:47,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:47,666 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-22 00:43:47,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:47,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [641829990] [2020-08-22 00:43:47,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:47,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:48,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:48,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:48,539 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:48,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [641829990] [2020-08-22 00:43:48,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:48,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-22 00:43:48,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582876773] [2020-08-22 00:43:48,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-22 00:43:48,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:48,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-22 00:43:48,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 00:43:48,541 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-22 00:43:50,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:50,135 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-22 00:43:50,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-22 00:43:50,135 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-22 00:43:50,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:50,136 INFO L225 Difference]: With dead ends: 146 [2020-08-22 00:43:50,136 INFO L226 Difference]: Without dead ends: 79 [2020-08-22 00:43:50,137 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 00:43:50,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-22 00:43:50,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-22 00:43:50,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-22 00:43:50,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-22 00:43:50,142 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-22 00:43:50,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:50,143 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-22 00:43:50,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-22 00:43:50,143 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-22 00:43:50,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-22 00:43:50,144 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:50,144 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:50,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-22 00:43:50,144 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:50,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:50,144 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-22 00:43:50,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:50,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2134188360] [2020-08-22 00:43:50,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:50,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:51,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:51,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:51,043 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:51,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2134188360] [2020-08-22 00:43:51,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:51,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-22 00:43:51,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259019833] [2020-08-22 00:43:51,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-22 00:43:51,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:51,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-22 00:43:51,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 00:43:51,045 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-22 00:43:52,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:52,669 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-22 00:43:52,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-22 00:43:52,669 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-22 00:43:52,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:52,670 INFO L225 Difference]: With dead ends: 150 [2020-08-22 00:43:52,670 INFO L226 Difference]: Without dead ends: 81 [2020-08-22 00:43:52,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 00:43:52,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-22 00:43:52,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-22 00:43:52,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-22 00:43:52,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-22 00:43:52,678 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-22 00:43:52,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:52,679 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-22 00:43:52,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-22 00:43:52,679 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-22 00:43:52,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-22 00:43:52,680 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:52,680 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:52,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-22 00:43:52,680 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:52,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:52,680 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-22 00:43:52,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:52,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167990836] [2020-08-22 00:43:52,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:52,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:53,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:53,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:53,641 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:53,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167990836] [2020-08-22 00:43:53,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:53,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-22 00:43:53,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250016727] [2020-08-22 00:43:53,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-22 00:43:53,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:53,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-22 00:43:53,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 00:43:53,644 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-22 00:43:55,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:55,319 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-22 00:43:55,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-22 00:43:55,319 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-22 00:43:55,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:55,320 INFO L225 Difference]: With dead ends: 154 [2020-08-22 00:43:55,320 INFO L226 Difference]: Without dead ends: 83 [2020-08-22 00:43:55,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 00:43:55,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-22 00:43:55,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-22 00:43:55,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-22 00:43:55,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-22 00:43:55,326 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-22 00:43:55,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:55,326 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-22 00:43:55,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-22 00:43:55,326 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-22 00:43:55,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-22 00:43:55,327 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:55,327 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:55,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-22 00:43:55,327 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:55,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:55,328 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-22 00:43:55,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:55,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269689446] [2020-08-22 00:43:55,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:55,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:56,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:56,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:56,353 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:56,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269689446] [2020-08-22 00:43:56,354 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:56,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-22 00:43:56,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085395879] [2020-08-22 00:43:56,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-22 00:43:56,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:56,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-22 00:43:56,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 00:43:56,355 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-22 00:43:58,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:43:58,176 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-22 00:43:58,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-22 00:43:58,177 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-22 00:43:58,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:43:58,178 INFO L225 Difference]: With dead ends: 158 [2020-08-22 00:43:58,178 INFO L226 Difference]: Without dead ends: 85 [2020-08-22 00:43:58,179 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 00:43:58,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-22 00:43:58,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-22 00:43:58,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-22 00:43:58,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-22 00:43:58,184 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-22 00:43:58,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:43:58,184 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-22 00:43:58,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-22 00:43:58,184 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-22 00:43:58,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-22 00:43:58,185 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:43:58,185 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:43:58,185 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-22 00:43:58,185 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:43:58,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:43:58,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-22 00:43:58,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:43:58,185 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1417458749] [2020-08-22 00:43:58,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:43:58,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:59,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:43:59,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:43:59,281 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:43:59,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1417458749] [2020-08-22 00:43:59,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:43:59,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-22 00:43:59,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097628015] [2020-08-22 00:43:59,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-22 00:43:59,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:43:59,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-22 00:43:59,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 00:43:59,283 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-22 00:44:01,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:01,163 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-22 00:44:01,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-22 00:44:01,165 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-22 00:44:01,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:01,165 INFO L225 Difference]: With dead ends: 162 [2020-08-22 00:44:01,165 INFO L226 Difference]: Without dead ends: 87 [2020-08-22 00:44:01,166 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 00:44:01,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-22 00:44:01,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-22 00:44:01,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-22 00:44:01,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-22 00:44:01,170 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-22 00:44:01,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:01,171 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-22 00:44:01,171 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-22 00:44:01,171 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-22 00:44:01,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-22 00:44:01,171 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:01,171 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:01,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-22 00:44:01,172 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:01,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:01,172 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-22 00:44:01,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:01,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698020501] [2020-08-22 00:44:01,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:01,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:02,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:02,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:02,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:02,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698020501] [2020-08-22 00:44:02,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:02,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-22 00:44:02,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194915941] [2020-08-22 00:44:02,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-22 00:44:02,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:02,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-22 00:44:02,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 00:44:02,368 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-22 00:44:04,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:04,416 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-22 00:44:04,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-22 00:44:04,417 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-22 00:44:04,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:04,418 INFO L225 Difference]: With dead ends: 166 [2020-08-22 00:44:04,418 INFO L226 Difference]: Without dead ends: 89 [2020-08-22 00:44:04,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 00:44:04,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-22 00:44:04,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-22 00:44:04,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-22 00:44:04,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-22 00:44:04,424 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-22 00:44:04,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:04,424 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-22 00:44:04,425 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-22 00:44:04,425 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-22 00:44:04,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-22 00:44:04,425 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:04,426 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:04,426 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-22 00:44:04,426 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:04,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:04,426 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-22 00:44:04,426 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:04,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [858475118] [2020-08-22 00:44:04,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:04,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:05,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:05,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:05,779 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:05,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [858475118] [2020-08-22 00:44:05,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:05,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-22 00:44:05,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603789291] [2020-08-22 00:44:05,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-22 00:44:05,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:05,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-22 00:44:05,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 00:44:05,780 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-22 00:44:07,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:07,919 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-22 00:44:07,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-22 00:44:07,920 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-22 00:44:07,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:07,921 INFO L225 Difference]: With dead ends: 170 [2020-08-22 00:44:07,921 INFO L226 Difference]: Without dead ends: 91 [2020-08-22 00:44:07,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 00:44:07,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-22 00:44:07,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-22 00:44:07,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-22 00:44:07,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-22 00:44:07,927 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-22 00:44:07,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:07,927 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-22 00:44:07,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-22 00:44:07,928 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-22 00:44:07,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-22 00:44:07,928 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:07,928 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:07,929 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-22 00:44:07,929 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:07,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:07,929 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-22 00:44:07,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:07,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [799242660] [2020-08-22 00:44:07,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:07,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:09,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:09,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:09,226 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:09,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [799242660] [2020-08-22 00:44:09,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:09,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-22 00:44:09,226 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017477462] [2020-08-22 00:44:09,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-22 00:44:09,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:09,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-22 00:44:09,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 00:44:09,228 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-22 00:44:11,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:11,462 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-22 00:44:11,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-22 00:44:11,464 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-22 00:44:11,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:11,465 INFO L225 Difference]: With dead ends: 174 [2020-08-22 00:44:11,465 INFO L226 Difference]: Without dead ends: 93 [2020-08-22 00:44:11,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 00:44:11,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-22 00:44:11,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-22 00:44:11,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-22 00:44:11,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-22 00:44:11,472 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-22 00:44:11,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:11,473 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-22 00:44:11,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-22 00:44:11,473 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-22 00:44:11,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-22 00:44:11,474 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:11,474 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:11,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-22 00:44:11,474 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:11,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:11,474 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-22 00:44:11,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:11,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [342660362] [2020-08-22 00:44:11,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:11,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:12,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:12,877 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [342660362] [2020-08-22 00:44:12,877 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:12,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-22 00:44:12,878 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736639831] [2020-08-22 00:44:12,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-22 00:44:12,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:12,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-22 00:44:12,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 00:44:12,879 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states. [2020-08-22 00:44:15,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:15,146 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2020-08-22 00:44:15,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-22 00:44:15,149 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 89 [2020-08-22 00:44:15,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:15,150 INFO L225 Difference]: With dead ends: 178 [2020-08-22 00:44:15,150 INFO L226 Difference]: Without dead ends: 95 [2020-08-22 00:44:15,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=121, Invalid=1601, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 00:44:15,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-22 00:44:15,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2020-08-22 00:44:15,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-08-22 00:44:15,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2020-08-22 00:44:15,165 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 89 [2020-08-22 00:44:15,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:15,165 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2020-08-22 00:44:15,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-22 00:44:15,165 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2020-08-22 00:44:15,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-22 00:44:15,166 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:15,166 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:15,167 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-22 00:44:15,167 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:15,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:15,167 INFO L82 PathProgramCache]: Analyzing trace with hash 477506189, now seen corresponding path program 38 times [2020-08-22 00:44:15,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:15,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2043602916] [2020-08-22 00:44:15,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:15,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:16,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:16,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:16,616 INFO L134 CoverageAnalysis]: Checked inductivity of 1446 backedges. 2 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:16,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2043602916] [2020-08-22 00:44:16,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:16,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-22 00:44:16,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350635739] [2020-08-22 00:44:16,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-22 00:44:16,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:16,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-22 00:44:16,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 00:44:16,618 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 42 states.