/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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.3 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 04:47:08,357 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 04:47:08,359 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 04:47:08,385 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 04:47:08,386 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 04:47:08,387 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 04:47:08,388 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 04:47:08,390 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 04:47:08,391 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 04:47:08,392 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 04:47:08,393 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 04:47:08,394 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 04:47:08,394 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 04:47:08,395 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 04:47:08,396 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 04:47:08,397 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 04:47:08,398 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 04:47:08,399 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 04:47:08,400 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 04:47:08,402 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 04:47:08,403 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 04:47:08,404 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 04:47:08,405 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 04:47:08,406 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 04:47:08,408 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 04:47:08,409 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 04:47:08,409 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 04:47:08,410 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 04:47:08,410 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 04:47:08,411 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-22 04:47:08,415 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 04:47:08,416 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 04:47:08,417 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 04:47:08,418 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 04:47:08,461 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 04:47:08,461 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 04:47:08,463 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 04:47:08,466 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 04:47:08,466 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 04:47:08,466 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 04:47:08,466 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 04:47:08,467 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 04:47:08,467 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 04:47:08,467 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 04:47:08,467 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 04:47:08,467 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 04:47:08,468 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 04:47:08,468 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 04:47:08,468 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 04:47:08,468 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 04:47:08,468 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 04:47:08,469 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 04:47:08,470 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 04:47:08,470 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 04:47:08,471 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 04:47:08,471 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 04:47:08,471 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 04:47:08,471 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 04:47:08,472 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 04:47:08,472 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 04:47:08,472 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 04:47:08,472 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 04:47:08,472 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 04:47:08,472 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=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; [2020-08-22 04:47:08,800 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 04:47:08,821 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 04:47:08,824 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 04:47:08,825 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 04:47:08,825 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 04:47:08,826 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-22 04:47:08,885 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9f7f5fb7c/acfe22cb657f4a7b8bef2c151ea31d4d/FLAGcc4569998 [2020-08-22 04:47:09,325 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 04:47:09,326 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-22 04:47:09,332 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9f7f5fb7c/acfe22cb657f4a7b8bef2c151ea31d4d/FLAGcc4569998 [2020-08-22 04:47:09,750 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9f7f5fb7c/acfe22cb657f4a7b8bef2c151ea31d4d [2020-08-22 04:47:09,759 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 04:47:09,761 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 04:47:09,762 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 04:47:09,763 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 04:47:09,766 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 04:47:09,767 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:47:09" (1/1) ... [2020-08-22 04:47:09,770 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78323104 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:09, skipping insertion in model container [2020-08-22 04:47:09,771 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:47:09" (1/1) ... [2020-08-22 04:47:09,778 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 04:47:09,795 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 04:47:09,949 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 04:47:09,953 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 04:47:09,965 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 04:47:09,977 INFO L208 MainTranslator]: Completed translation [2020-08-22 04:47:09,978 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:09 WrapperNode [2020-08-22 04:47:09,978 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 04:47:09,979 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 04:47:09,979 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 04:47:09,979 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 04:47:09,989 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:09" (1/1) ... [2020-08-22 04:47:09,989 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:09" (1/1) ... [2020-08-22 04:47:10,076 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:09" (1/1) ... [2020-08-22 04:47:10,077 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:09" (1/1) ... [2020-08-22 04:47:10,088 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:09" (1/1) ... [2020-08-22 04:47:10,093 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:09" (1/1) ... [2020-08-22 04:47:10,094 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:09" (1/1) ... [2020-08-22 04:47:10,096 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 04:47:10,096 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 04:47:10,096 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 04:47:10,096 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 04:47:10,097 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:09" (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 04:47:10,158 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 04:47:10,158 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 04:47:10,159 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 04:47:10,159 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 04:47:10,159 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 04:47:10,159 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 04:47:10,159 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 04:47:10,159 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 04:47:10,159 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 04:47:10,331 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 04:47:10,331 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 04:47:10,335 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:47:10 BoogieIcfgContainer [2020-08-22 04:47:10,335 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 04:47:10,336 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 04:47:10,336 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 04:47:10,342 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 04:47:10,342 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 04:47:09" (1/3) ... [2020-08-22 04:47:10,343 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4523bd4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:47:10, skipping insertion in model container [2020-08-22 04:47:10,343 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:47:09" (2/3) ... [2020-08-22 04:47:10,344 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4523bd4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:47:10, skipping insertion in model container [2020-08-22 04:47:10,344 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:47:10" (3/3) ... [2020-08-22 04:47:10,347 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-22 04:47:10,358 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 04:47:10,365 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 04:47:10,379 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 04:47:10,403 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 04:47:10,404 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 04:47:10,404 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 04:47:10,404 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 04:47:10,404 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 04:47:10,404 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 04:47:10,404 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 04:47:10,405 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 04:47:10,423 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-22 04:47:10,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-22 04:47:10,428 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:10,429 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:10,430 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:10,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:10,435 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-22 04:47:10,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:10,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [401073010] [2020-08-22 04:47:10,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:10,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:10,822 WARN L193 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 5 [2020-08-22 04:47:10,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:10,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:10,838 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 04:47:10,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [401073010] [2020-08-22 04:47:10,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 04:47:10,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 04:47:10,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614734915] [2020-08-22 04:47:10,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 04:47:10,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:10,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 04:47:10,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 04:47:10,876 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-22 04:47:10,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:10,923 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-22 04:47:10,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 04:47:10,925 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-22 04:47:10,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:10,935 INFO L225 Difference]: With dead ends: 29 [2020-08-22 04:47:10,935 INFO L226 Difference]: Without dead ends: 12 [2020-08-22 04:47:10,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 04:47:10,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-22 04:47:10,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-22 04:47:10,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-22 04:47:10,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-22 04:47:10,969 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-22 04:47:10,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:10,970 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-22 04:47:10,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 04:47:10,970 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-22 04:47:10,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-22 04:47:10,971 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:10,971 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:10,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 04:47:10,972 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:10,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:10,972 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-22 04:47:10,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:10,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1707536877] [2020-08-22 04:47:10,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:10,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:11,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:11,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:11,070 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:11,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1707536877] [2020-08-22 04:47:11,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:11,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-22 04:47:11,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288354347] [2020-08-22 04:47:11,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 04:47:11,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:11,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 04:47:11,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-22 04:47:11,075 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-22 04:47:11,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:11,093 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-22 04:47:11,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 04:47:11,094 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-22 04:47:11,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:11,095 INFO L225 Difference]: With dead ends: 18 [2020-08-22 04:47:11,095 INFO L226 Difference]: Without dead ends: 13 [2020-08-22 04:47:11,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-22 04:47:11,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-22 04:47:11,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-22 04:47:11,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-22 04:47:11,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-22 04:47:11,101 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-22 04:47:11,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:11,102 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-22 04:47:11,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 04:47:11,102 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-22 04:47:11,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 04:47:11,103 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:11,103 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:11,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 04:47:11,104 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:11,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:11,104 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-22 04:47:11,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:11,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [249871050] [2020-08-22 04:47:11,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:11,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:11,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:11,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:11,252 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:11,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [249871050] [2020-08-22 04:47:11,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:11,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-22 04:47:11,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489548886] [2020-08-22 04:47:11,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 04:47:11,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:11,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 04:47:11,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 04:47:11,255 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-22 04:47:11,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:11,281 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-22 04:47:11,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 04:47:11,282 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-22 04:47:11,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:11,283 INFO L225 Difference]: With dead ends: 19 [2020-08-22 04:47:11,283 INFO L226 Difference]: Without dead ends: 14 [2020-08-22 04:47:11,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 04:47:11,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-22 04:47:11,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-22 04:47:11,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-22 04:47:11,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-22 04:47:11,290 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-22 04:47:11,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:11,290 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-22 04:47:11,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 04:47:11,291 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-22 04:47:11,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 04:47:11,292 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:11,292 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:11,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 04:47:11,292 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:11,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:11,293 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-22 04:47:11,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:11,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1577783173] [2020-08-22 04:47:11,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:11,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:11,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:11,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:11,392 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:11,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1577783173] [2020-08-22 04:47:11,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:11,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 04:47:11,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896840703] [2020-08-22 04:47:11,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 04:47:11,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:11,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 04:47:11,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 04:47:11,395 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-22 04:47:11,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:11,420 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-22 04:47:11,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 04:47:11,420 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-22 04:47:11,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:11,421 INFO L225 Difference]: With dead ends: 20 [2020-08-22 04:47:11,421 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 04:47:11,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 04:47:11,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 04:47:11,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 04:47:11,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 04:47:11,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-22 04:47:11,427 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-22 04:47:11,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:11,427 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-22 04:47:11,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 04:47:11,427 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-22 04:47:11,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-22 04:47:11,428 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:11,428 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:11,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 04:47:11,429 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:11,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:11,429 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-22 04:47:11,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:11,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [82974254] [2020-08-22 04:47:11,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:11,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:11,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:11,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:11,534 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:11,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [82974254] [2020-08-22 04:47:11,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:11,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 04:47:11,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242192188] [2020-08-22 04:47:11,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 04:47:11,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:11,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 04:47:11,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 04:47:11,537 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-22 04:47:11,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:11,573 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-22 04:47:11,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 04:47:11,573 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-22 04:47:11,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:11,574 INFO L225 Difference]: With dead ends: 21 [2020-08-22 04:47:11,574 INFO L226 Difference]: Without dead ends: 16 [2020-08-22 04:47:11,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 04:47:11,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-22 04:47:11,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-22 04:47:11,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 04:47:11,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-22 04:47:11,581 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-22 04:47:11,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:11,581 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-22 04:47:11,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 04:47:11,582 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-22 04:47:11,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 04:47:11,582 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:11,583 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:11,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 04:47:11,583 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:11,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:11,584 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-22 04:47:11,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:11,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [995313864] [2020-08-22 04:47:11,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:11,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:11,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:11,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:11,716 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:11,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [995313864] [2020-08-22 04:47:11,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:11,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 04:47:11,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890505181] [2020-08-22 04:47:11,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 04:47:11,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:11,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 04:47:11,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-22 04:47:11,719 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-22 04:47:11,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:11,764 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-22 04:47:11,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 04:47:11,765 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-22 04:47:11,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:11,765 INFO L225 Difference]: With dead ends: 22 [2020-08-22 04:47:11,766 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 04:47:11,766 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-22 04:47:11,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 04:47:11,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 04:47:11,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 04:47:11,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-22 04:47:11,771 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-22 04:47:11,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:11,772 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-22 04:47:11,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 04:47:11,772 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-22 04:47:11,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 04:47:11,773 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:11,773 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:11,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 04:47:11,774 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:11,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:11,774 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-22 04:47:11,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:11,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1961368766] [2020-08-22 04:47:11,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:11,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:11,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:11,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:11,918 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:11,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1961368766] [2020-08-22 04:47:11,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:11,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 04:47:11,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127563407] [2020-08-22 04:47:11,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 04:47:11,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:11,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 04:47:11,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-22 04:47:11,920 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-22 04:47:11,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:11,970 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-22 04:47:11,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 04:47:11,971 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-22 04:47:11,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:11,971 INFO L225 Difference]: With dead ends: 23 [2020-08-22 04:47:11,972 INFO L226 Difference]: Without dead ends: 18 [2020-08-22 04:47:11,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-22 04:47:11,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-22 04:47:11,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-22 04:47:11,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-22 04:47:11,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-22 04:47:11,977 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-22 04:47:11,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:11,978 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-22 04:47:11,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 04:47:11,978 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-22 04:47:11,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 04:47:11,979 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:11,979 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:11,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 04:47:11,979 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:11,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:11,980 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-22 04:47:11,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:11,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1746388881] [2020-08-22 04:47:11,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:11,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:12,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:12,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:12,153 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:12,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1746388881] [2020-08-22 04:47:12,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:12,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 04:47:12,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114710976] [2020-08-22 04:47:12,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 04:47:12,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:12,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 04:47:12,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-22 04:47:12,155 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-22 04:47:12,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:12,209 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-22 04:47:12,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 04:47:12,210 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-22 04:47:12,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:12,211 INFO L225 Difference]: With dead ends: 24 [2020-08-22 04:47:12,211 INFO L226 Difference]: Without dead ends: 19 [2020-08-22 04:47:12,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-22 04:47:12,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-22 04:47:12,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-22 04:47:12,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-22 04:47:12,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-22 04:47:12,217 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-22 04:47:12,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:12,217 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-22 04:47:12,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 04:47:12,217 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-22 04:47:12,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-22 04:47:12,218 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:12,218 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:12,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 04:47:12,219 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:12,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:12,219 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-22 04:47:12,219 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:12,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598313209] [2020-08-22 04:47:12,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:12,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:12,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:12,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:12,371 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:12,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598313209] [2020-08-22 04:47:12,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:12,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 04:47:12,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810228054] [2020-08-22 04:47:12,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 04:47:12,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:12,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 04:47:12,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-22 04:47:12,374 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-22 04:47:12,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:12,442 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-22 04:47:12,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 04:47:12,443 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-22 04:47:12,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:12,443 INFO L225 Difference]: With dead ends: 25 [2020-08-22 04:47:12,444 INFO L226 Difference]: Without dead ends: 20 [2020-08-22 04:47:12,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-22 04:47:12,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-22 04:47:12,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-22 04:47:12,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 04:47:12,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-22 04:47:12,449 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-22 04:47:12,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:12,450 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-22 04:47:12,450 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 04:47:12,450 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-22 04:47:12,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 04:47:12,451 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:12,451 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:12,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 04:47:12,451 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:12,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:12,452 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-22 04:47:12,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:12,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31262803] [2020-08-22 04:47:12,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:12,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:12,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:12,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:12,630 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:12,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31262803] [2020-08-22 04:47:12,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:12,632 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 04:47:12,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288034953] [2020-08-22 04:47:12,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 04:47:12,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:12,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 04:47:12,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-22 04:47:12,634 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-22 04:47:12,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:12,748 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-22 04:47:12,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 04:47:12,749 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-22 04:47:12,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:12,750 INFO L225 Difference]: With dead ends: 26 [2020-08-22 04:47:12,750 INFO L226 Difference]: Without dead ends: 21 [2020-08-22 04:47:12,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-22 04:47:12,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-22 04:47:12,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-22 04:47:12,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-22 04:47:12,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-22 04:47:12,755 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-22 04:47:12,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:12,755 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-22 04:47:12,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 04:47:12,756 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-22 04:47:12,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-22 04:47:12,756 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:12,756 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:12,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 04:47:12,757 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:12,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:12,757 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-22 04:47:12,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:12,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1655757205] [2020-08-22 04:47:12,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:12,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:12,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:12,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:12,944 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:12,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1655757205] [2020-08-22 04:47:12,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:12,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 04:47:12,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815846533] [2020-08-22 04:47:12,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 04:47:12,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:12,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 04:47:12,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-22 04:47:12,947 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-22 04:47:13,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:13,054 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-22 04:47:13,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 04:47:13,056 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-22 04:47:13,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:13,056 INFO L225 Difference]: With dead ends: 27 [2020-08-22 04:47:13,057 INFO L226 Difference]: Without dead ends: 22 [2020-08-22 04:47:13,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-22 04:47:13,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-22 04:47:13,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-22 04:47:13,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-22 04:47:13,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-22 04:47:13,067 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-22 04:47:13,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:13,068 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-22 04:47:13,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 04:47:13,068 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-22 04:47:13,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 04:47:13,069 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:13,069 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:13,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 04:47:13,069 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:13,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:13,072 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-22 04:47:13,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:13,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [798369629] [2020-08-22 04:47:13,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:13,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:13,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:13,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:13,272 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:13,272 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [798369629] [2020-08-22 04:47:13,272 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:13,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 04:47:13,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195428500] [2020-08-22 04:47:13,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 04:47:13,273 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:13,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 04:47:13,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-22 04:47:13,274 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-22 04:47:13,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:13,376 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-22 04:47:13,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 04:47:13,376 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-22 04:47:13,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:13,377 INFO L225 Difference]: With dead ends: 28 [2020-08-22 04:47:13,377 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 04:47:13,378 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-22 04:47:13,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 04:47:13,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-22 04:47:13,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-22 04:47:13,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-22 04:47:13,382 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-22 04:47:13,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:13,382 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-22 04:47:13,383 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 04:47:13,383 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-22 04:47:13,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 04:47:13,383 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:13,383 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:13,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 04:47:13,384 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:13,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:13,384 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-22 04:47:13,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:13,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [699566565] [2020-08-22 04:47:13,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:13,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:13,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:13,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:13,582 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:13,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [699566565] [2020-08-22 04:47:13,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:13,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 04:47:13,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564322366] [2020-08-22 04:47:13,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 04:47:13,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:13,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 04:47:13,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-22 04:47:13,585 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-22 04:47:13,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:13,713 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-22 04:47:13,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 04:47:13,714 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-22 04:47:13,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:13,715 INFO L225 Difference]: With dead ends: 29 [2020-08-22 04:47:13,715 INFO L226 Difference]: Without dead ends: 24 [2020-08-22 04:47:13,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-22 04:47:13,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-22 04:47:13,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-22 04:47:13,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-22 04:47:13,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-22 04:47:13,720 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-22 04:47:13,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:13,720 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-22 04:47:13,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 04:47:13,720 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-22 04:47:13,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-22 04:47:13,721 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:13,721 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:13,721 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 04:47:13,722 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:13,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:13,722 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-22 04:47:13,722 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:13,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1942630883] [2020-08-22 04:47:13,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:13,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:13,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:13,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:13,957 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:13,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1942630883] [2020-08-22 04:47:13,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:13,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 04:47:13,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677646969] [2020-08-22 04:47:13,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 04:47:13,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:13,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 04:47:13,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-22 04:47:13,960 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-22 04:47:14,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:14,092 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-22 04:47:14,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 04:47:14,094 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-22 04:47:14,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:14,095 INFO L225 Difference]: With dead ends: 30 [2020-08-22 04:47:14,095 INFO L226 Difference]: Without dead ends: 25 [2020-08-22 04:47:14,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-22 04:47:14,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-22 04:47:14,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-22 04:47:14,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 04:47:14,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-22 04:47:14,102 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-22 04:47:14,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:14,103 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-22 04:47:14,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 04:47:14,103 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-22 04:47:14,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 04:47:14,105 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:14,105 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:14,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 04:47:14,106 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:14,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:14,107 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-22 04:47:14,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:14,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1824683565] [2020-08-22 04:47:14,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:14,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:14,369 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:14,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:14,372 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:14,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1824683565] [2020-08-22 04:47:14,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:14,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 04:47:14,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771289935] [2020-08-22 04:47:14,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 04:47:14,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:14,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 04:47:14,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-22 04:47:14,375 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-22 04:47:14,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:14,524 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-22 04:47:14,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 04:47:14,525 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-22 04:47:14,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:14,526 INFO L225 Difference]: With dead ends: 31 [2020-08-22 04:47:14,526 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 04:47:14,527 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-22 04:47:14,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 04:47:14,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-22 04:47:14,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 04:47:14,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-22 04:47:14,533 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-22 04:47:14,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:14,535 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-22 04:47:14,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 04:47:14,535 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-22 04:47:14,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 04:47:14,536 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:14,536 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:14,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 04:47:14,537 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:14,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:14,537 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-22 04:47:14,537 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:14,538 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1969639858] [2020-08-22 04:47:14,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:14,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:14,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:14,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:14,832 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:14,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1969639858] [2020-08-22 04:47:14,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:14,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 04:47:14,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898149831] [2020-08-22 04:47:14,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 04:47:14,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:14,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 04:47:14,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-22 04:47:14,838 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-22 04:47:15,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:15,018 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-22 04:47:15,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 04:47:15,018 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-22 04:47:15,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:15,019 INFO L225 Difference]: With dead ends: 32 [2020-08-22 04:47:15,019 INFO L226 Difference]: Without dead ends: 27 [2020-08-22 04:47:15,020 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-22 04:47:15,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-22 04:47:15,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-22 04:47:15,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-22 04:47:15,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-22 04:47:15,024 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-22 04:47:15,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:15,024 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-22 04:47:15,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 04:47:15,025 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-22 04:47:15,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-22 04:47:15,025 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:15,025 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:15,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 04:47:15,026 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:15,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:15,026 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-22 04:47:15,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:15,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [713375572] [2020-08-22 04:47:15,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:15,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:15,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:15,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:15,301 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:15,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [713375572] [2020-08-22 04:47:15,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:15,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 04:47:15,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292311560] [2020-08-22 04:47:15,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 04:47:15,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:15,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 04:47:15,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-22 04:47:15,303 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-22 04:47:15,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:15,522 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-22 04:47:15,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 04:47:15,524 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-22 04:47:15,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:15,525 INFO L225 Difference]: With dead ends: 33 [2020-08-22 04:47:15,525 INFO L226 Difference]: Without dead ends: 28 [2020-08-22 04:47:15,527 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-22 04:47:15,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-22 04:47:15,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-22 04:47:15,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 04:47:15,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-22 04:47:15,534 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-22 04:47:15,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:15,534 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-22 04:47:15,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 04:47:15,534 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-22 04:47:15,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 04:47:15,538 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:15,538 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:15,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-22 04:47:15,538 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:15,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:15,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-22 04:47:15,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:15,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [967804173] [2020-08-22 04:47:15,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:15,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:15,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:15,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:15,859 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:15,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [967804173] [2020-08-22 04:47:15,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:15,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 04:47:15,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563137927] [2020-08-22 04:47:15,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 04:47:15,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:15,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 04:47:15,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-22 04:47:15,861 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-22 04:47:16,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:16,088 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-22 04:47:16,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 04:47:16,089 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-22 04:47:16,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:16,090 INFO L225 Difference]: With dead ends: 34 [2020-08-22 04:47:16,090 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 04:47:16,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-22 04:47:16,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 04:47:16,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-22 04:47:16,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-22 04:47:16,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-22 04:47:16,096 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-22 04:47:16,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:16,096 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-22 04:47:16,096 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 04:47:16,097 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-22 04:47:16,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 04:47:16,097 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:16,097 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:16,098 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-22 04:47:16,098 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:16,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:16,098 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-22 04:47:16,098 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:16,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741879471] [2020-08-22 04:47:16,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:16,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:16,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:16,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:16,463 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:16,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741879471] [2020-08-22 04:47:16,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:16,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 04:47:16,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331051941] [2020-08-22 04:47:16,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 04:47:16,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:16,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 04:47:16,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-22 04:47:16,466 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-22 04:47:16,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:16,710 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-22 04:47:16,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 04:47:16,710 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-22 04:47:16,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:16,711 INFO L225 Difference]: With dead ends: 35 [2020-08-22 04:47:16,711 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 04:47:16,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-22 04:47:16,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 04:47:16,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-22 04:47:16,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 04:47:16,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-22 04:47:16,723 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-22 04:47:16,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:16,724 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-22 04:47:16,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 04:47:16,724 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-22 04:47:16,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 04:47:16,725 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:16,725 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:16,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-22 04:47:16,725 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:16,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:16,726 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-22 04:47:16,730 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:16,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1288801308] [2020-08-22 04:47:16,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:16,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:17,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:17,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:17,094 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:17,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1288801308] [2020-08-22 04:47:17,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:17,094 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 04:47:17,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456094554] [2020-08-22 04:47:17,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 04:47:17,095 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:17,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 04:47:17,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-22 04:47:17,096 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-22 04:47:17,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:17,365 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-22 04:47:17,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 04:47:17,366 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-22 04:47:17,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:17,367 INFO L225 Difference]: With dead ends: 36 [2020-08-22 04:47:17,367 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 04:47:17,367 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-22 04:47:17,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 04:47:17,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-22 04:47:17,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-22 04:47:17,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-22 04:47:17,372 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-22 04:47:17,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:17,373 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-22 04:47:17,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 04:47:17,373 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-22 04:47:17,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-22 04:47:17,374 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:17,374 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:17,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-22 04:47:17,374 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:17,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:17,375 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-22 04:47:17,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:17,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [67014483] [2020-08-22 04:47:17,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:17,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:17,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:17,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:17,804 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:17,805 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [67014483] [2020-08-22 04:47:17,805 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:17,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 04:47:17,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846328131] [2020-08-22 04:47:17,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 04:47:17,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:17,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 04:47:17,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-22 04:47:17,806 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-22 04:47:18,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:18,139 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-22 04:47:18,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 04:47:18,139 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-22 04:47:18,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:18,140 INFO L225 Difference]: With dead ends: 37 [2020-08-22 04:47:18,140 INFO L226 Difference]: Without dead ends: 32 [2020-08-22 04:47:18,140 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-22 04:47:18,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-22 04:47:18,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-22 04:47:18,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 04:47:18,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-22 04:47:18,145 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-22 04:47:18,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:18,145 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-22 04:47:18,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 04:47:18,145 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-22 04:47:18,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 04:47:18,146 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:18,146 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:18,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-22 04:47:18,146 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:18,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:18,147 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-22 04:47:18,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:18,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1711699973] [2020-08-22 04:47:18,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:18,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:18,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:18,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:18,601 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:18,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1711699973] [2020-08-22 04:47:18,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:18,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-22 04:47:18,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232838765] [2020-08-22 04:47:18,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 04:47:18,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:18,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 04:47:18,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-22 04:47:18,603 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-22 04:47:18,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:18,919 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-22 04:47:18,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-22 04:47:18,921 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-22 04:47:18,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:18,921 INFO L225 Difference]: With dead ends: 38 [2020-08-22 04:47:18,921 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 04:47:18,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-22 04:47:18,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 04:47:18,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-22 04:47:18,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-22 04:47:18,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-22 04:47:18,927 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-22 04:47:18,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:18,927 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-22 04:47:18,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 04:47:18,927 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-22 04:47:18,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-22 04:47:18,928 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:18,928 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:18,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 04:47:18,928 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:18,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:18,929 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-22 04:47:18,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:18,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [727215794] [2020-08-22 04:47:18,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:18,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:19,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:19,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:19,422 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:19,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [727215794] [2020-08-22 04:47:19,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:19,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 04:47:19,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282068544] [2020-08-22 04:47:19,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 04:47:19,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:19,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 04:47:19,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-22 04:47:19,430 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-22 04:47:19,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:19,728 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-22 04:47:19,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 04:47:19,729 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-22 04:47:19,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:19,729 INFO L225 Difference]: With dead ends: 39 [2020-08-22 04:47:19,730 INFO L226 Difference]: Without dead ends: 34 [2020-08-22 04:47:19,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-22 04:47:19,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-22 04:47:19,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-22 04:47:19,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 04:47:19,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-22 04:47:19,742 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-22 04:47:19,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:19,743 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-22 04:47:19,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 04:47:19,743 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-22 04:47:19,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 04:47:19,743 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:19,744 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:19,747 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-22 04:47:19,747 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:19,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:19,747 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-22 04:47:19,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:19,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [497273892] [2020-08-22 04:47:19,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:19,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:20,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:20,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:20,295 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:20,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [497273892] [2020-08-22 04:47:20,295 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:20,295 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-22 04:47:20,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788942679] [2020-08-22 04:47:20,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-22 04:47:20,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:20,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-22 04:47:20,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-22 04:47:20,297 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-22 04:47:20,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:20,627 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-22 04:47:20,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-22 04:47:20,627 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-22 04:47:20,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:20,628 INFO L225 Difference]: With dead ends: 40 [2020-08-22 04:47:20,628 INFO L226 Difference]: Without dead ends: 35 [2020-08-22 04:47:20,628 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-22 04:47:20,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-22 04:47:20,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-22 04:47:20,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 04:47:20,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-22 04:47:20,633 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-22 04:47:20,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:20,633 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-22 04:47:20,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-22 04:47:20,633 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-22 04:47:20,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 04:47:20,634 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:20,634 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:20,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-22 04:47:20,634 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:20,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:20,635 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-22 04:47:20,635 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:20,635 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1493394580] [2020-08-22 04:47:20,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:20,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:21,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:21,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:21,171 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:21,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1493394580] [2020-08-22 04:47:21,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:21,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-22 04:47:21,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282836255] [2020-08-22 04:47:21,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-22 04:47:21,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:21,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-22 04:47:21,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-22 04:47:21,174 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-22 04:47:21,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:21,566 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-22 04:47:21,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-22 04:47:21,566 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-22 04:47:21,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:21,567 INFO L225 Difference]: With dead ends: 41 [2020-08-22 04:47:21,567 INFO L226 Difference]: Without dead ends: 36 [2020-08-22 04:47:21,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-22 04:47:21,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-22 04:47:21,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-22 04:47:21,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-22 04:47:21,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-22 04:47:21,575 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-22 04:47:21,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:21,575 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-22 04:47:21,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-22 04:47:21,575 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-22 04:47:21,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-22 04:47:21,576 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:21,576 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:21,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-22 04:47:21,577 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:21,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:21,577 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-22 04:47:21,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:21,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [218976958] [2020-08-22 04:47:21,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:21,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:22,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:22,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:22,159 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:22,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [218976958] [2020-08-22 04:47:22,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:22,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-22 04:47:22,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766701262] [2020-08-22 04:47:22,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-22 04:47:22,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:22,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-22 04:47:22,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-22 04:47:22,161 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-22 04:47:22,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:22,562 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-22 04:47:22,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-22 04:47:22,562 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-22 04:47:22,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:22,563 INFO L225 Difference]: With dead ends: 42 [2020-08-22 04:47:22,563 INFO L226 Difference]: Without dead ends: 37 [2020-08-22 04:47:22,563 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-22 04:47:22,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-22 04:47:22,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-22 04:47:22,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 04:47:22,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-22 04:47:22,570 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-22 04:47:22,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:22,571 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-22 04:47:22,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-22 04:47:22,571 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-22 04:47:22,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 04:47:22,573 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:22,573 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:22,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-22 04:47:22,574 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:22,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:22,574 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-22 04:47:22,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:22,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1049812643] [2020-08-22 04:47:22,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:22,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:23,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:23,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:23,242 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:23,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1049812643] [2020-08-22 04:47:23,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:23,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 04:47:23,243 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193658030] [2020-08-22 04:47:23,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 04:47:23,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:23,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 04:47:23,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-22 04:47:23,244 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-22 04:47:23,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:23,678 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-22 04:47:23,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-22 04:47:23,679 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-22 04:47:23,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:23,679 INFO L225 Difference]: With dead ends: 43 [2020-08-22 04:47:23,680 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 04:47:23,680 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-22 04:47:23,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 04:47:23,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-22 04:47:23,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 04:47:23,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-22 04:47:23,692 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-22 04:47:23,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:23,692 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-22 04:47:23,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-22 04:47:23,692 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-22 04:47:23,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 04:47:23,694 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:23,694 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:23,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-22 04:47:23,694 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:23,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:23,695 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-22 04:47:23,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:23,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [34913884] [2020-08-22 04:47:23,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:23,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:24,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:24,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:24,337 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:24,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [34913884] [2020-08-22 04:47:24,338 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:24,338 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-22 04:47:24,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302420799] [2020-08-22 04:47:24,339 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-22 04:47:24,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:24,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-22 04:47:24,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-22 04:47:24,340 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-22 04:47:24,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:24,854 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-22 04:47:24,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-22 04:47:24,859 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-22 04:47:24,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:24,860 INFO L225 Difference]: With dead ends: 44 [2020-08-22 04:47:24,860 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 04:47:24,861 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-22 04:47:24,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 04:47:24,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-22 04:47:24,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 04:47:24,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-22 04:47:24,865 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-22 04:47:24,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:24,865 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-22 04:47:24,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-22 04:47:24,865 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-22 04:47:24,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-22 04:47:24,866 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:24,866 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:24,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-22 04:47:24,866 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:24,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:24,867 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-22 04:47:24,867 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:24,867 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2127648040] [2020-08-22 04:47:24,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:24,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:25,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:25,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:25,605 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:25,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2127648040] [2020-08-22 04:47:25,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:25,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-22 04:47:25,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065340029] [2020-08-22 04:47:25,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-22 04:47:25,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:25,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-22 04:47:25,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-22 04:47:25,607 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-22 04:47:26,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:26,153 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-22 04:47:26,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-22 04:47:26,154 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-22 04:47:26,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:26,155 INFO L225 Difference]: With dead ends: 45 [2020-08-22 04:47:26,155 INFO L226 Difference]: Without dead ends: 40 [2020-08-22 04:47:26,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-22 04:47:26,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-22 04:47:26,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-22 04:47:26,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-22 04:47:26,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-22 04:47:26,160 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-22 04:47:26,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:26,160 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-22 04:47:26,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-22 04:47:26,160 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-22 04:47:26,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-22 04:47:26,161 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:26,161 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:26,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-22 04:47:26,161 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:26,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:26,162 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-22 04:47:26,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:26,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1419270552] [2020-08-22 04:47:26,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:26,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:26,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:26,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:26,877 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:26,877 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1419270552] [2020-08-22 04:47:26,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:26,878 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-22 04:47:26,878 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523288415] [2020-08-22 04:47:26,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-22 04:47:26,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:26,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-22 04:47:26,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-22 04:47:26,879 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-22 04:47:27,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:27,457 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-22 04:47:27,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-22 04:47:27,458 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-22 04:47:27,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:27,458 INFO L225 Difference]: With dead ends: 46 [2020-08-22 04:47:27,458 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 04:47:27,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-22 04:47:27,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 04:47:27,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-22 04:47:27,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 04:47:27,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-22 04:47:27,463 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-22 04:47:27,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:27,464 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-22 04:47:27,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-22 04:47:27,464 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-22 04:47:27,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-22 04:47:27,464 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:27,465 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:27,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-22 04:47:27,465 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:27,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:27,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-22 04:47:27,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:27,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [783044697] [2020-08-22 04:47:27,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:27,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:28,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:28,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:28,285 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:28,285 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [783044697] [2020-08-22 04:47:28,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:28,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-22 04:47:28,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946100063] [2020-08-22 04:47:28,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-22 04:47:28,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:28,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-22 04:47:28,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 04:47:28,287 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-22 04:47:28,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:28,937 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-22 04:47:28,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-22 04:47:28,938 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-22 04:47:28,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:28,939 INFO L225 Difference]: With dead ends: 47 [2020-08-22 04:47:28,940 INFO L226 Difference]: Without dead ends: 42 [2020-08-22 04:47:28,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 04:47:28,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-22 04:47:28,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-22 04:47:28,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 04:47:28,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-22 04:47:28,945 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-22 04:47:28,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:28,945 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-22 04:47:28,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-22 04:47:28,945 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-22 04:47:28,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 04:47:28,946 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:28,946 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:28,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-22 04:47:28,946 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:28,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:28,947 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-22 04:47:28,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:28,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1735507230] [2020-08-22 04:47:28,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:28,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:29,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:29,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:29,801 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:29,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1735507230] [2020-08-22 04:47:29,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:29,801 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-22 04:47:29,801 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471068048] [2020-08-22 04:47:29,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-22 04:47:29,802 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:29,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-22 04:47:29,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 04:47:29,803 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-22 04:47:30,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:30,471 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-22 04:47:30,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-22 04:47:30,471 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-22 04:47:30,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:30,472 INFO L225 Difference]: With dead ends: 48 [2020-08-22 04:47:30,472 INFO L226 Difference]: Without dead ends: 43 [2020-08-22 04:47:30,473 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 04:47:30,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-22 04:47:30,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-22 04:47:30,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-22 04:47:30,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-22 04:47:30,477 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-22 04:47:30,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:30,477 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-22 04:47:30,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-22 04:47:30,478 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-22 04:47:30,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-22 04:47:30,478 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:30,478 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:30,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-22 04:47:30,479 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:30,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:30,479 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-22 04:47:30,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:30,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [470008168] [2020-08-22 04:47:30,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:30,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:31,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:31,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:31,358 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:31,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [470008168] [2020-08-22 04:47:31,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:31,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-22 04:47:31,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7743881] [2020-08-22 04:47:31,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-22 04:47:31,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:31,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-22 04:47:31,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 04:47:31,360 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-22 04:47:32,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:32,091 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-22 04:47:32,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-22 04:47:32,092 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-22 04:47:32,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:32,092 INFO L225 Difference]: With dead ends: 49 [2020-08-22 04:47:32,092 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 04:47:32,093 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 04:47:32,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 04:47:32,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-22 04:47:32,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 04:47:32,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-22 04:47:32,098 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-22 04:47:32,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:32,098 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-22 04:47:32,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-22 04:47:32,099 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-22 04:47:32,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 04:47:32,099 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:32,099 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:32,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-22 04:47:32,100 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:32,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:32,100 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-22 04:47:32,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:32,100 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1221995080] [2020-08-22 04:47:32,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:32,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:33,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:33,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:33,052 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:33,053 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1221995080] [2020-08-22 04:47:33,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:33,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-22 04:47:33,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781899463] [2020-08-22 04:47:33,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-22 04:47:33,053 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:33,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-22 04:47:33,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 04:47:33,054 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-22 04:47:33,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:33,838 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-22 04:47:33,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-22 04:47:33,839 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-22 04:47:33,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:33,839 INFO L225 Difference]: With dead ends: 50 [2020-08-22 04:47:33,839 INFO L226 Difference]: Without dead ends: 45 [2020-08-22 04:47:33,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 04:47:33,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-22 04:47:33,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-22 04:47:33,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-22 04:47:33,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-22 04:47:33,843 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-22 04:47:33,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:33,843 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-22 04:47:33,844 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-22 04:47:33,844 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-22 04:47:33,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-22 04:47:33,844 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:33,844 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:33,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-22 04:47:33,845 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:33,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:33,845 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-22 04:47:33,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:33,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [466109796] [2020-08-22 04:47:33,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:33,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:34,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:34,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:34,879 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:34,879 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [466109796] [2020-08-22 04:47:34,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:34,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-22 04:47:34,880 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237788123] [2020-08-22 04:47:34,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-22 04:47:34,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:34,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-22 04:47:34,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 04:47:34,881 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-22 04:47:35,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:35,688 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-22 04:47:35,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-22 04:47:35,689 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-22 04:47:35,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:35,689 INFO L225 Difference]: With dead ends: 51 [2020-08-22 04:47:35,690 INFO L226 Difference]: Without dead ends: 46 [2020-08-22 04:47:35,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 04:47:35,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-22 04:47:35,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-22 04:47:35,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 04:47:35,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-22 04:47:35,694 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-22 04:47:35,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:35,694 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-22 04:47:35,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-22 04:47:35,694 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-22 04:47:35,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-22 04:47:35,695 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:35,695 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:35,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-22 04:47:35,695 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:35,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:35,696 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-22 04:47:35,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:35,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [358588925] [2020-08-22 04:47:35,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:35,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:36,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:36,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:36,666 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:36,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [358588925] [2020-08-22 04:47:36,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:36,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-22 04:47:36,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697638103] [2020-08-22 04:47:36,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-22 04:47:36,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:36,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-22 04:47:36,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 04:47:36,669 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-22 04:47:37,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:37,501 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-22 04:47:37,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-22 04:47:37,502 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-22 04:47:37,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:37,503 INFO L225 Difference]: With dead ends: 52 [2020-08-22 04:47:37,503 INFO L226 Difference]: Without dead ends: 47 [2020-08-22 04:47:37,505 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 04:47:37,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-22 04:47:37,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-22 04:47:37,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-22 04:47:37,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-22 04:47:37,509 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-22 04:47:37,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:37,510 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-22 04:47:37,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-22 04:47:37,510 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-22 04:47:37,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-22 04:47:37,512 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:37,512 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:37,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-22 04:47:37,513 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:37,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:37,513 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-22 04:47:37,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:37,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [963697138] [2020-08-22 04:47:37,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:37,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:38,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:38,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:38,602 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:38,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [963697138] [2020-08-22 04:47:38,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:38,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-22 04:47:38,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279398332] [2020-08-22 04:47:38,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-22 04:47:38,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:38,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-22 04:47:38,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 04:47:38,604 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-22 04:47:39,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:39,509 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-22 04:47:39,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-22 04:47:39,512 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-22 04:47:39,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:39,512 INFO L225 Difference]: With dead ends: 53 [2020-08-22 04:47:39,512 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 04:47:39,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 04:47:39,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 04:47:39,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-22 04:47:39,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-22 04:47:39,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-22 04:47:39,518 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-22 04:47:39,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:39,518 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-22 04:47:39,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-22 04:47:39,518 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-22 04:47:39,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-22 04:47:39,519 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:39,519 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:39,519 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-22 04:47:39,519 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:39,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:39,520 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-22 04:47:39,520 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:39,520 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1254552699] [2020-08-22 04:47:39,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:39,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:40,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:40,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:40,656 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:40,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1254552699] [2020-08-22 04:47:40,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:40,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-22 04:47:40,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031107918] [2020-08-22 04:47:40,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-22 04:47:40,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:40,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-22 04:47:40,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 04:47:40,659 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-22 04:47:41,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:41,608 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-22 04:47:41,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-22 04:47:41,609 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-22 04:47:41,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:41,609 INFO L225 Difference]: With dead ends: 54 [2020-08-22 04:47:41,609 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 04:47:41,610 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 04:47:41,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 04:47:41,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-22 04:47:41,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-22 04:47:41,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-22 04:47:41,613 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-22 04:47:41,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:41,613 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-22 04:47:41,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-22 04:47:41,613 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-22 04:47:41,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-22 04:47:41,614 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:41,614 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:41,614 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-22 04:47:41,614 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:41,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:41,615 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-22 04:47:41,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:41,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [312069360] [2020-08-22 04:47:41,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:41,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:42,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:42,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:42,768 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:42,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [312069360] [2020-08-22 04:47:42,768 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:42,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-22 04:47:42,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586277959] [2020-08-22 04:47:42,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-22 04:47:42,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:42,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-22 04:47:42,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 04:47:42,772 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-22 04:47:43,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:43,787 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-22 04:47:43,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-22 04:47:43,788 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-22 04:47:43,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:43,789 INFO L225 Difference]: With dead ends: 55 [2020-08-22 04:47:43,789 INFO L226 Difference]: Without dead ends: 50 [2020-08-22 04:47:43,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 04:47:43,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-22 04:47:43,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-22 04:47:43,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-22 04:47:43,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-22 04:47:43,794 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-22 04:47:43,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:43,795 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-22 04:47:43,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-22 04:47:43,795 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-22 04:47:43,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-22 04:47:43,795 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:43,796 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:43,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-22 04:47:43,796 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:43,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:43,796 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-22 04:47:43,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:43,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1002284312] [2020-08-22 04:47:43,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:43,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:45,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:45,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:45,012 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:45,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1002284312] [2020-08-22 04:47:45,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:45,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-22 04:47:45,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945832143] [2020-08-22 04:47:45,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-22 04:47:45,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:45,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-22 04:47:45,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 04:47:45,014 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-22 04:47:46,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:46,041 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-22 04:47:46,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-22 04:47:46,043 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-22 04:47:46,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:46,044 INFO L225 Difference]: With dead ends: 56 [2020-08-22 04:47:46,044 INFO L226 Difference]: Without dead ends: 51 [2020-08-22 04:47:46,045 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 04:47:46,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-22 04:47:46,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-22 04:47:46,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-22 04:47:46,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-22 04:47:46,048 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-22 04:47:46,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:46,048 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-22 04:47:46,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-22 04:47:46,049 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-22 04:47:46,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-22 04:47:46,049 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:46,049 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:46,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-22 04:47:46,049 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:46,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:46,049 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-22 04:47:46,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:46,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [161458194] [2020-08-22 04:47:46,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:46,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:47,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:47,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:47,333 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:47,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [161458194] [2020-08-22 04:47:47,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:47,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-22 04:47:47,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406130498] [2020-08-22 04:47:47,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-22 04:47:47,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:47,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-22 04:47:47,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 04:47:47,336 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-22 04:47:48,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:48,454 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-22 04:47:48,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-22 04:47:48,456 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-22 04:47:48,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:48,457 INFO L225 Difference]: With dead ends: 57 [2020-08-22 04:47:48,457 INFO L226 Difference]: Without dead ends: 52 [2020-08-22 04:47:48,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 04:47:48,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-22 04:47:48,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-22 04:47:48,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-22 04:47:48,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-22 04:47:48,465 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-22 04:47:48,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:48,465 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-22 04:47:48,465 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-22 04:47:48,466 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-22 04:47:48,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-22 04:47:48,466 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:48,466 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:48,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-22 04:47:48,466 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:48,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:48,467 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-22 04:47:48,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:48,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1166464814] [2020-08-22 04:47:48,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:48,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:49,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:49,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:49,802 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:49,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1166464814] [2020-08-22 04:47:49,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:49,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-22 04:47:49,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111562134] [2020-08-22 04:47:49,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-22 04:47:49,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:49,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-22 04:47:49,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-22 04:47:49,804 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-22 04:47:50,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:50,918 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-22 04:47:50,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-22 04:47:50,919 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-22 04:47:50,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:50,919 INFO L225 Difference]: With dead ends: 58 [2020-08-22 04:47:50,920 INFO L226 Difference]: Without dead ends: 53 [2020-08-22 04:47:50,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-22 04:47:50,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-22 04:47:50,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-22 04:47:50,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-22 04:47:50,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-22 04:47:50,924 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-22 04:47:50,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:50,924 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-22 04:47:50,924 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-22 04:47:50,924 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-22 04:47:50,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-22 04:47:50,924 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:50,925 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:50,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-22 04:47:50,925 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:50,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:50,925 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-22 04:47:50,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:50,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [456877223] [2020-08-22 04:47:50,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:50,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:52,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:52,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:52,350 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:52,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [456877223] [2020-08-22 04:47:52,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:52,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-22 04:47:52,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062116136] [2020-08-22 04:47:52,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-22 04:47:52,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:52,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-22 04:47:52,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 04:47:52,352 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-22 04:47:53,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:53,555 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-22 04:47:53,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-22 04:47:53,557 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-22 04:47:53,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:53,558 INFO L225 Difference]: With dead ends: 59 [2020-08-22 04:47:53,558 INFO L226 Difference]: Without dead ends: 54 [2020-08-22 04:47:53,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 04:47:53,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-22 04:47:53,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-22 04:47:53,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-22 04:47:53,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-22 04:47:53,564 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-22 04:47:53,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:53,565 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-22 04:47:53,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-22 04:47:53,565 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-22 04:47:53,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-22 04:47:53,565 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:53,566 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:53,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-22 04:47:53,566 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:53,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:53,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-22 04:47:53,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:53,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2132116206] [2020-08-22 04:47:53,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:53,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:55,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:55,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:55,012 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:55,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2132116206] [2020-08-22 04:47:55,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:55,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-22 04:47:55,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760548790] [2020-08-22 04:47:55,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-22 04:47:55,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:55,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-22 04:47:55,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-22 04:47:55,014 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-22 04:47:56,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:56,229 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-22 04:47:56,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-22 04:47:56,235 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-22 04:47:56,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:56,236 INFO L225 Difference]: With dead ends: 60 [2020-08-22 04:47:56,236 INFO L226 Difference]: Without dead ends: 55 [2020-08-22 04:47:56,236 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-22 04:47:56,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-22 04:47:56,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-22 04:47:56,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-22 04:47:56,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-22 04:47:56,239 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-22 04:47:56,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:56,240 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-22 04:47:56,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-22 04:47:56,240 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-22 04:47:56,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-22 04:47:56,240 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:56,240 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:56,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-22 04:47:56,240 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:56,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:56,241 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-22 04:47:56,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:56,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463094022] [2020-08-22 04:47:56,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:56,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:57,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:57,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:57,724 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:57,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463094022] [2020-08-22 04:47:57,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:57,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-22 04:47:57,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164894265] [2020-08-22 04:47:57,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-22 04:47:57,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:57,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-22 04:47:57,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 04:47:57,725 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-22 04:47:59,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:59,043 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-22 04:47:59,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-22 04:47:59,044 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-22 04:47:59,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:59,045 INFO L225 Difference]: With dead ends: 61 [2020-08-22 04:47:59,045 INFO L226 Difference]: Without dead ends: 56 [2020-08-22 04:47:59,045 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 04:47:59,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-22 04:47:59,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-22 04:47:59,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-22 04:47:59,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-22 04:47:59,054 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-22 04:47:59,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:59,055 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-22 04:47:59,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-22 04:47:59,055 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-22 04:47:59,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-22 04:47:59,055 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:59,056 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:59,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-22 04:47:59,056 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:59,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:59,056 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-22 04:47:59,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:59,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1146459596] [2020-08-22 04:47:59,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:59,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:00,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:48:00,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:00,599 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:48:00,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1146459596] [2020-08-22 04:48:00,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:48:00,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-22 04:48:00,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895897179] [2020-08-22 04:48:00,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-22 04:48:00,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:48:00,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-22 04:48:00,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-22 04:48:00,601 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-22 04:48:01,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:48:01,911 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-22 04:48:01,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-22 04:48:01,912 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-22 04:48:01,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:48:01,912 INFO L225 Difference]: With dead ends: 62 [2020-08-22 04:48:01,913 INFO L226 Difference]: Without dead ends: 57 [2020-08-22 04:48:01,913 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-22 04:48:01,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-22 04:48:01,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-22 04:48:01,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-22 04:48:01,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-22 04:48:01,919 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-22 04:48:01,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:48:01,919 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-22 04:48:01,919 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-22 04:48:01,919 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-22 04:48:01,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-22 04:48:01,920 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:48:01,920 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:48:01,920 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-22 04:48:01,920 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:48:01,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:48:01,920 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-22 04:48:01,921 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:48:01,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2027760681] [2020-08-22 04:48:01,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:48:01,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:03,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:48:03,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:03,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:48:03,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2027760681] [2020-08-22 04:48:03,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:48:03,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-22 04:48:03,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192465225] [2020-08-22 04:48:03,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-22 04:48:03,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:48:03,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-22 04:48:03,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-22 04:48:03,511 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-22 04:48:04,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:48:04,963 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-22 04:48:04,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-22 04:48:04,964 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-22 04:48:04,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:48:04,965 INFO L225 Difference]: With dead ends: 63 [2020-08-22 04:48:04,965 INFO L226 Difference]: Without dead ends: 58 [2020-08-22 04:48:04,965 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-22 04:48:04,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-22 04:48:04,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-22 04:48:04,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-22 04:48:04,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-22 04:48:04,970 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-22 04:48:04,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:48:04,971 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-22 04:48:04,971 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-22 04:48:04,971 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-22 04:48:04,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-22 04:48:04,971 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:48:04,971 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:48:04,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-22 04:48:04,972 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:48:04,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:48:04,972 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-22 04:48:04,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:48:04,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1593912214] [2020-08-22 04:48:04,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:48:04,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:06,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:48:06,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:06,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:48:06,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1593912214] [2020-08-22 04:48:06,644 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:48:06,644 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-22 04:48:06,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757530831] [2020-08-22 04:48:06,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-22 04:48:06,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:48:06,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-22 04:48:06,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-22 04:48:06,645 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-22 04:48:08,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:48:08,082 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-22 04:48:08,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-22 04:48:08,083 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-22 04:48:08,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:48:08,084 INFO L225 Difference]: With dead ends: 64 [2020-08-22 04:48:08,084 INFO L226 Difference]: Without dead ends: 59 [2020-08-22 04:48:08,084 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-22 04:48:08,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-22 04:48:08,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-22 04:48:08,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-22 04:48:08,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-22 04:48:08,089 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-22 04:48:08,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:48:08,089 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-22 04:48:08,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-22 04:48:08,090 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-22 04:48:08,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-22 04:48:08,090 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:48:08,090 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:48:08,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-22 04:48:08,091 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:48:08,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:48:08,091 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-22 04:48:08,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:48:08,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [769279450] [2020-08-22 04:48:08,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:48:08,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:09,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:48:09,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:48:09,873 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:48:09,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [769279450] [2020-08-22 04:48:09,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:48:09,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-22 04:48:09,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533493808] [2020-08-22 04:48:09,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-22 04:48:09,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:48:09,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-22 04:48:09,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2020-08-22 04:48:09,875 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 51 states. [2020-08-22 04:48:11,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:48:11,394 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2020-08-22 04:48:11,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-22 04:48:11,395 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 58 [2020-08-22 04:48:11,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:48:11,396 INFO L225 Difference]: With dead ends: 65 [2020-08-22 04:48:11,396 INFO L226 Difference]: Without dead ends: 60 [2020-08-22 04:48:11,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2020-08-22 04:48:11,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-22 04:48:11,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-08-22 04:48:11,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-22 04:48:11,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2020-08-22 04:48:11,401 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 58 [2020-08-22 04:48:11,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:48:11,401 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2020-08-22 04:48:11,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-22 04:48:11,402 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2020-08-22 04:48:11,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-22 04:48:11,402 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:48:11,402 INFO L422 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:48:11,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-22 04:48:11,403 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:48:11,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:48:11,403 INFO L82 PathProgramCache]: Analyzing trace with hash 712317521, now seen corresponding path program 49 times [2020-08-22 04:48:11,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:48:11,403 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1388345333] [2020-08-22 04:48:11,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:48:11,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat