/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 18:49:07,797 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 18:49:07,800 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 18:49:07,839 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 18:49:07,839 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 18:49:07,849 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 18:49:07,851 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 18:49:07,855 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 18:49:07,857 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 18:49:07,861 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 18:49:07,862 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 18:49:07,862 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 18:49:07,863 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 18:49:07,866 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 18:49:07,868 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 18:49:07,870 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 18:49:07,871 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 18:49:07,873 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 18:49:07,875 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 18:49:07,883 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 18:49:07,885 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 18:49:07,886 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 18:49:07,887 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 18:49:07,888 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 18:49:07,901 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 18:49:07,901 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 18:49:07,901 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 18:49:07,903 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 18:49:07,903 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 18:49:07,904 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 18:49:07,904 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 18:49:07,906 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 18:49:07,907 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 18:49:07,907 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 18:49:07,908 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 18:49:07,909 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 18:49:07,909 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 18:49:07,910 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 18:49:07,910 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 18:49:07,911 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 18:49:07,912 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 18:49:07,913 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 18:49:07,953 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 18:49:07,953 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 18:49:07,955 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 18:49:07,956 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 18:49:07,956 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 18:49:07,956 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 18:49:07,957 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 18:49:07,957 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 18:49:07,957 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 18:49:07,957 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 18:49:07,958 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 18:49:07,958 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 18:49:07,959 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 18:49:07,959 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 18:49:07,959 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 18:49:07,959 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 18:49:07,960 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 18:49:07,960 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 18:49:07,960 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 18:49:07,960 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 18:49:07,960 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 18:49:07,961 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 18:49:07,961 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 18:49:07,961 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 18:49:07,961 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 18:49:07,961 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 18:49:07,962 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 18:49:07,962 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 18:49:07,962 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 18:49:07,962 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=LOWLEXORDER; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=LOWLEXORDER; [2020-08-18 18:49:08,281 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 18:49:08,298 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 18:49:08,304 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 18:49:08,306 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 18:49:08,307 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 18:49:08,307 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-18 18:49:08,371 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/09c06d7d7/df44a14d7eca4b40b8592ccd3a527397/FLAG2e0cbe120 [2020-08-18 18:49:08,772 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 18:49:08,776 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-18 18:49:08,781 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/09c06d7d7/df44a14d7eca4b40b8592ccd3a527397/FLAG2e0cbe120 [2020-08-18 18:49:09,147 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/09c06d7d7/df44a14d7eca4b40b8592ccd3a527397 [2020-08-18 18:49:09,157 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 18:49:09,158 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 18:49:09,159 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 18:49:09,159 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 18:49:09,163 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 18:49:09,164 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:49:09" (1/1) ... [2020-08-18 18:49:09,167 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5fc1a58f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:09, skipping insertion in model container [2020-08-18 18:49:09,167 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:49:09" (1/1) ... [2020-08-18 18:49:09,175 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 18:49:09,192 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 18:49:09,356 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:49:09,361 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 18:49:09,377 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:49:09,389 INFO L208 MainTranslator]: Completed translation [2020-08-18 18:49:09,389 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:09 WrapperNode [2020-08-18 18:49:09,390 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 18:49:09,390 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 18:49:09,390 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 18:49:09,391 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 18:49:09,402 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:09" (1/1) ... [2020-08-18 18:49:09,403 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:09" (1/1) ... [2020-08-18 18:49:09,407 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:09" (1/1) ... [2020-08-18 18:49:09,407 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:09" (1/1) ... [2020-08-18 18:49:09,497 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:09" (1/1) ... [2020-08-18 18:49:09,504 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:09" (1/1) ... [2020-08-18 18:49:09,505 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:09" (1/1) ... [2020-08-18 18:49:09,507 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 18:49:09,507 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 18:49:09,507 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 18:49:09,507 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 18:49:09,508 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:09" (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 [2020-08-18 18:49:09,568 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 18:49:09,569 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 18:49:09,569 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 18:49:09,571 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 18:49:09,571 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 18:49:09,571 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 18:49:09,572 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 18:49:09,572 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 18:49:09,572 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 18:49:09,762 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 18:49:09,762 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 18:49:09,766 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:49:09 BoogieIcfgContainer [2020-08-18 18:49:09,766 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 18:49:09,767 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 18:49:09,767 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 18:49:09,770 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 18:49:09,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 06:49:09" (1/3) ... [2020-08-18 18:49:09,771 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26b81537 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:49:09, skipping insertion in model container [2020-08-18 18:49:09,771 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:09" (2/3) ... [2020-08-18 18:49:09,772 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26b81537 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:49:09, skipping insertion in model container [2020-08-18 18:49:09,772 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:49:09" (3/3) ... [2020-08-18 18:49:09,773 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-18 18:49:09,782 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 18:49:09,792 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 18:49:09,806 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 18:49:09,829 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 18:49:09,829 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 18:49:09,829 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 18:49:09,829 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 18:49:09,830 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 18:49:09,830 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 18:49:09,830 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 18:49:09,830 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 18:49:09,849 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 18:49:09,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 18:49:09,857 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:09,858 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:09,859 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:09,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:09,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 18:49:09,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:09,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673558422] [2020-08-18 18:49:09,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:09,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:10,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:10,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:10,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:10,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673558422] [2020-08-18 18:49:10,077 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:49:10,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 18:49:10,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881222080] [2020-08-18 18:49:10,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 18:49:10,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:10,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 18:49:10,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 18:49:10,105 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 18:49:10,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:10,154 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 18:49:10,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 18:49:10,157 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 18:49:10,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:10,170 INFO L225 Difference]: With dead ends: 29 [2020-08-18 18:49:10,171 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 18:49:10,176 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 18:49:10,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 18:49:10,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 18:49:10,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 18:49:10,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 18:49:10,248 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 18:49:10,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:10,252 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 18:49:10,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 18:49:10,253 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 18:49:10,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 18:49:10,253 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:10,255 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:10,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 18:49:10,256 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:10,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:10,256 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 18:49:10,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:10,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [803087506] [2020-08-18 18:49:10,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:10,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:10,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:10,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:10,416 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:10,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [803087506] [2020-08-18 18:49:10,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:10,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 18:49:10,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998539426] [2020-08-18 18:49:10,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 18:49:10,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:10,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 18:49:10,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 18:49:10,421 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 18:49:10,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:10,440 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 18:49:10,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 18:49:10,441 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 18:49:10,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:10,442 INFO L225 Difference]: With dead ends: 18 [2020-08-18 18:49:10,442 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 18:49:10,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 18:49:10,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 18:49:10,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 18:49:10,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 18:49:10,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 18:49:10,449 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 18:49:10,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:10,449 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 18:49:10,450 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 18:49:10,450 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 18:49:10,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 18:49:10,451 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:10,451 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:10,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 18:49:10,452 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:10,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:10,452 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 18:49:10,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:10,453 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1616902719] [2020-08-18 18:49:10,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:10,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:10,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:10,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:10,554 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:10,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1616902719] [2020-08-18 18:49:10,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:10,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 18:49:10,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582194347] [2020-08-18 18:49:10,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 18:49:10,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:10,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 18:49:10,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 18:49:10,558 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 18:49:10,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:10,583 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 18:49:10,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:49:10,583 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 18:49:10,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:10,584 INFO L225 Difference]: With dead ends: 19 [2020-08-18 18:49:10,585 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 18:49:10,585 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 18:49:10,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 18:49:10,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 18:49:10,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 18:49:10,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 18:49:10,591 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 18:49:10,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:10,592 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 18:49:10,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 18:49:10,592 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 18:49:10,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 18:49:10,593 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:10,593 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:10,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 18:49:10,593 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:10,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:10,594 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 18:49:10,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:10,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [743940489] [2020-08-18 18:49:10,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:10,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:10,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:10,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:10,709 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:10,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [743940489] [2020-08-18 18:49:10,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:10,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 18:49:10,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914059877] [2020-08-18 18:49:10,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 18:49:10,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:10,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 18:49:10,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 18:49:10,712 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 18:49:10,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:10,741 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 18:49:10,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 18:49:10,742 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 18:49:10,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:10,743 INFO L225 Difference]: With dead ends: 20 [2020-08-18 18:49:10,743 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 18:49:10,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 18:49:10,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 18:49:10,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 18:49:10,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 18:49:10,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 18:49:10,749 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 18:49:10,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:10,749 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 18:49:10,749 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 18:49:10,749 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 18:49:10,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 18:49:10,750 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:10,750 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:10,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 18:49:10,751 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:10,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:10,751 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 18:49:10,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:10,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [696231389] [2020-08-18 18:49:10,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:10,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:10,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:10,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:10,871 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:10,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [696231389] [2020-08-18 18:49:10,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:10,872 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 18:49:10,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721536756] [2020-08-18 18:49:10,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 18:49:10,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:10,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 18:49:10,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 18:49:10,874 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 18:49:10,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:10,913 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 18:49:10,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 18:49:10,914 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 18:49:10,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:10,915 INFO L225 Difference]: With dead ends: 21 [2020-08-18 18:49:10,915 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 18:49:10,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 18:49:10,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 18:49:10,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 18:49:10,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 18:49:10,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 18:49:10,922 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 18:49:10,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:10,923 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 18:49:10,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 18:49:10,923 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 18:49:10,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 18:49:10,924 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:10,924 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:10,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 18:49:10,925 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:10,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:10,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 18:49:10,926 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:10,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [636657517] [2020-08-18 18:49:10,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:10,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:11,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:11,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:11,106 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:11,106 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [636657517] [2020-08-18 18:49:11,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:11,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 18:49:11,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721541589] [2020-08-18 18:49:11,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 18:49:11,109 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:11,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 18:49:11,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 18:49:11,111 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-18 18:49:11,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:11,175 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 18:49:11,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 18:49:11,177 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-18 18:49:11,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:11,178 INFO L225 Difference]: With dead ends: 22 [2020-08-18 18:49:11,178 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 18:49:11,182 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 18:49:11,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 18:49:11,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 18:49:11,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 18:49:11,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 18:49:11,188 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 18:49:11,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:11,188 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 18:49:11,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 18:49:11,189 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 18:49:11,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 18:49:11,189 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:11,190 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:11,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 18:49:11,190 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:11,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:11,191 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 18:49:11,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:11,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1037069287] [2020-08-18 18:49:11,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:11,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:11,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:11,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:11,333 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:11,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1037069287] [2020-08-18 18:49:11,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:11,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 18:49:11,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623580871] [2020-08-18 18:49:11,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 18:49:11,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:11,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 18:49:11,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 18:49:11,336 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-18 18:49:11,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:11,396 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-18 18:49:11,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 18:49:11,398 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-18 18:49:11,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:11,399 INFO L225 Difference]: With dead ends: 23 [2020-08-18 18:49:11,399 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 18:49:11,399 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 [2020-08-18 18:49:11,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 18:49:11,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 18:49:11,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 18:49:11,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-18 18:49:11,408 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-18 18:49:11,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:11,408 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-18 18:49:11,409 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 18:49:11,409 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-18 18:49:11,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 18:49:11,410 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:11,410 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:11,411 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 18:49:11,411 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:11,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:11,411 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-18 18:49:11,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:11,413 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [770380563] [2020-08-18 18:49:11,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:11,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:11,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:11,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:11,591 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:11,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [770380563] [2020-08-18 18:49:11,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:11,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 18:49:11,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459939612] [2020-08-18 18:49:11,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 18:49:11,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:11,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 18:49:11,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 18:49:11,593 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-18 18:49:11,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:11,648 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 18:49:11,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 18:49:11,649 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-18 18:49:11,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:11,650 INFO L225 Difference]: With dead ends: 24 [2020-08-18 18:49:11,650 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 18:49:11,651 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 18:49:11,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 18:49:11,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 18:49:11,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 18:49:11,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 18:49:11,656 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-18 18:49:11,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:11,656 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 18:49:11,656 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 18:49:11,656 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 18:49:11,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 18:49:11,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:11,658 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:11,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 18:49:11,659 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:11,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:11,659 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-18 18:49:11,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:11,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [218334806] [2020-08-18 18:49:11,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:11,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:11,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:11,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:11,811 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:11,811 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [218334806] [2020-08-18 18:49:11,811 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:11,811 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 18:49:11,812 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446198888] [2020-08-18 18:49:11,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 18:49:11,812 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:11,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 18:49:11,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 18:49:11,813 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-18 18:49:11,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:11,889 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-18 18:49:11,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 18:49:11,890 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-18 18:49:11,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:11,891 INFO L225 Difference]: With dead ends: 25 [2020-08-18 18:49:11,892 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 18:49:11,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 18:49:11,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 18:49:11,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 18:49:11,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 18:49:11,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 18:49:11,898 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-18 18:49:11,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:11,898 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 18:49:11,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 18:49:11,898 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 18:49:11,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 18:49:11,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:11,899 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:11,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 18:49:11,900 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:11,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:11,900 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-18 18:49:11,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:11,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [543455382] [2020-08-18 18:49:11,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:11,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:12,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,103 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:12,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [543455382] [2020-08-18 18:49:12,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:12,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 18:49:12,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295733782] [2020-08-18 18:49:12,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 18:49:12,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:12,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 18:49:12,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 18:49:12,107 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-18 18:49:12,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:12,214 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 18:49:12,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 18:49:12,215 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-18 18:49:12,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:12,217 INFO L225 Difference]: With dead ends: 26 [2020-08-18 18:49:12,217 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 18:49:12,218 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 18:49:12,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 18:49:12,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 18:49:12,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 18:49:12,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 18:49:12,224 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-18 18:49:12,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:12,224 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 18:49:12,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 18:49:12,224 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 18:49:12,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 18:49:12,225 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:12,226 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:12,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 18:49:12,226 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:12,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:12,227 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-18 18:49:12,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:12,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1402714907] [2020-08-18 18:49:12,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:12,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:12,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,413 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:12,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1402714907] [2020-08-18 18:49:12,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:12,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 18:49:12,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970178472] [2020-08-18 18:49:12,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 18:49:12,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:12,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 18:49:12,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 18:49:12,415 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-18 18:49:12,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:12,530 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-18 18:49:12,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 18:49:12,532 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-18 18:49:12,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:12,533 INFO L225 Difference]: With dead ends: 27 [2020-08-18 18:49:12,533 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 18:49:12,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 18:49:12,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 18:49:12,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 18:49:12,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 18:49:12,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-18 18:49:12,544 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-18 18:49:12,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:12,545 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-18 18:49:12,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 18:49:12,545 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-18 18:49:12,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 18:49:12,547 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:12,547 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:12,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 18:49:12,547 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:12,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:12,548 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-18 18:49:12,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:12,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [175344718] [2020-08-18 18:49:12,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:12,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:12,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,775 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:12,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [175344718] [2020-08-18 18:49:12,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:12,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 18:49:12,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362922725] [2020-08-18 18:49:12,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 18:49:12,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:12,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 18:49:12,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 18:49:12,778 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-18 18:49:12,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:12,885 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 18:49:12,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 18:49:12,885 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-18 18:49:12,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:12,886 INFO L225 Difference]: With dead ends: 28 [2020-08-18 18:49:12,886 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 18:49:12,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 18:49:12,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 18:49:12,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 18:49:12,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 18:49:12,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 18:49:12,892 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-18 18:49:12,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:12,892 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 18:49:12,892 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 18:49:12,893 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 18:49:12,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 18:49:12,893 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:12,893 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:12,894 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 18:49:12,894 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:12,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:12,894 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-18 18:49:12,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:12,895 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563802440] [2020-08-18 18:49:12,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:12,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:13,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:13,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:13,110 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:13,111 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563802440] [2020-08-18 18:49:13,111 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:13,111 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 18:49:13,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380281026] [2020-08-18 18:49:13,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 18:49:13,112 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:13,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 18:49:13,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 18:49:13,113 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-18 18:49:13,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:13,247 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 18:49:13,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 18:49:13,249 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-18 18:49:13,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:13,249 INFO L225 Difference]: With dead ends: 29 [2020-08-18 18:49:13,249 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 18:49:13,250 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 [2020-08-18 18:49:13,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 18:49:13,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 18:49:13,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 18:49:13,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-18 18:49:13,254 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-18 18:49:13,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:13,255 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-18 18:49:13,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 18:49:13,255 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-18 18:49:13,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 18:49:13,255 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:13,256 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:13,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 18:49:13,256 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:13,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:13,256 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-18 18:49:13,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:13,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1051979626] [2020-08-18 18:49:13,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:13,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:13,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:13,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:13,514 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:13,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1051979626] [2020-08-18 18:49:13,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:13,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 18:49:13,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214858791] [2020-08-18 18:49:13,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 18:49:13,516 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:13,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 18:49:13,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 18:49:13,517 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-18 18:49:13,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:13,657 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 18:49:13,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 18:49:13,658 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-18 18:49:13,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:13,658 INFO L225 Difference]: With dead ends: 30 [2020-08-18 18:49:13,659 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 18:49:13,659 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 18:49:13,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 18:49:13,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 18:49:13,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 18:49:13,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 18:49:13,664 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-18 18:49:13,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:13,664 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 18:49:13,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 18:49:13,665 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 18:49:13,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 18:49:13,665 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:13,665 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:13,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 18:49:13,666 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:13,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:13,666 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-18 18:49:13,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:13,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1535608012] [2020-08-18 18:49:13,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:13,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:13,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:13,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:13,911 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:13,912 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1535608012] [2020-08-18 18:49:13,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:13,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 18:49:13,913 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302458686] [2020-08-18 18:49:13,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 18:49:13,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:13,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 18:49:13,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 18:49:13,914 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-18 18:49:14,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:14,066 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-18 18:49:14,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 18:49:14,066 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-18 18:49:14,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:14,067 INFO L225 Difference]: With dead ends: 31 [2020-08-18 18:49:14,067 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 18:49:14,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 18:49:14,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 18:49:14,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 18:49:14,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 18:49:14,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 18:49:14,072 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-18 18:49:14,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:14,073 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 18:49:14,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 18:49:14,073 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 18:49:14,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 18:49:14,074 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:14,074 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:14,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 18:49:14,075 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:14,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:14,075 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-18 18:49:14,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:14,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [74474017] [2020-08-18 18:49:14,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:14,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:14,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:14,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:14,362 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:14,362 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [74474017] [2020-08-18 18:49:14,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:14,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 18:49:14,363 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749496602] [2020-08-18 18:49:14,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 18:49:14,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:14,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 18:49:14,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 18:49:14,364 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-18 18:49:14,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:14,531 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 18:49:14,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 18:49:14,532 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-18 18:49:14,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:14,532 INFO L225 Difference]: With dead ends: 32 [2020-08-18 18:49:14,533 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 18:49:14,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 18:49:14,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 18:49:14,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 18:49:14,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 18:49:14,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 18:49:14,538 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-18 18:49:14,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:14,538 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 18:49:14,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 18:49:14,538 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 18:49:14,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 18:49:14,539 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:14,539 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:14,539 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 18:49:14,540 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:14,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:14,540 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-18 18:49:14,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:14,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260252323] [2020-08-18 18:49:14,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:14,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:14,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:14,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:14,881 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:14,881 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260252323] [2020-08-18 18:49:14,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:14,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 18:49:14,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438321791] [2020-08-18 18:49:14,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 18:49:14,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:14,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 18:49:14,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 18:49:14,883 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-18 18:49:15,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:15,085 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-18 18:49:15,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 18:49:15,086 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-18 18:49:15,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:15,087 INFO L225 Difference]: With dead ends: 33 [2020-08-18 18:49:15,087 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 18:49:15,088 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 18:49:15,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 18:49:15,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 18:49:15,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 18:49:15,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-18 18:49:15,093 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-18 18:49:15,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:15,093 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-18 18:49:15,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 18:49:15,093 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-18 18:49:15,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 18:49:15,094 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:15,094 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:15,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 18:49:15,095 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:15,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:15,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-18 18:49:15,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:15,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260551050] [2020-08-18 18:49:15,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:15,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:15,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:15,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:15,440 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:15,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260551050] [2020-08-18 18:49:15,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:15,441 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 18:49:15,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45489559] [2020-08-18 18:49:15,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 18:49:15,442 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:15,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 18:49:15,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 18:49:15,443 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-18 18:49:15,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:15,658 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 18:49:15,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 18:49:15,659 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-18 18:49:15,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:15,660 INFO L225 Difference]: With dead ends: 34 [2020-08-18 18:49:15,660 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 18:49:15,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 18:49:15,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 18:49:15,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 18:49:15,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 18:49:15,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 18:49:15,665 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-18 18:49:15,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:15,665 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 18:49:15,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 18:49:15,666 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 18:49:15,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 18:49:15,666 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:15,666 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:15,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 18:49:15,667 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:15,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:15,667 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-18 18:49:15,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:15,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [725613149] [2020-08-18 18:49:15,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:15,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:16,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:16,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:16,046 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:16,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [725613149] [2020-08-18 18:49:16,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:16,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 18:49:16,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104689359] [2020-08-18 18:49:16,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 18:49:16,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:16,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 18:49:16,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 18:49:16,049 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-18 18:49:16,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:16,284 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 18:49:16,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 18:49:16,285 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-18 18:49:16,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:16,285 INFO L225 Difference]: With dead ends: 35 [2020-08-18 18:49:16,285 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 18:49:16,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 18:49:16,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 18:49:16,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 18:49:16,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 18:49:16,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-18 18:49:16,290 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-18 18:49:16,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:16,290 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-18 18:49:16,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 18:49:16,291 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-18 18:49:16,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 18:49:16,291 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:16,292 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:16,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 18:49:16,292 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:16,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:16,292 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-18 18:49:16,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:16,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574134656] [2020-08-18 18:49:16,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:16,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:16,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:16,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:16,680 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:16,680 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574134656] [2020-08-18 18:49:16,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:16,681 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 18:49:16,681 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755684290] [2020-08-18 18:49:16,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 18:49:16,681 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:16,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 18:49:16,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 18:49:16,682 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-18 18:49:16,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:16,962 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 18:49:16,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 18:49:16,963 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-18 18:49:16,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:16,963 INFO L225 Difference]: With dead ends: 36 [2020-08-18 18:49:16,964 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 18:49:16,964 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 18:49:16,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 18:49:16,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 18:49:16,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 18:49:16,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 18:49:16,969 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-18 18:49:16,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:16,969 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 18:49:16,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 18:49:16,969 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 18:49:16,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 18:49:16,970 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:16,970 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:16,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 18:49:16,971 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:16,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:16,971 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-18 18:49:16,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:16,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [968413698] [2020-08-18 18:49:16,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:16,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:17,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:17,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:17,350 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:17,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [968413698] [2020-08-18 18:49:17,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:17,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 18:49:17,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838581183] [2020-08-18 18:49:17,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 18:49:17,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:17,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 18:49:17,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 18:49:17,354 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-18 18:49:17,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:17,673 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-18 18:49:17,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 18:49:17,674 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-18 18:49:17,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:17,674 INFO L225 Difference]: With dead ends: 37 [2020-08-18 18:49:17,675 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 18:49:17,676 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 [2020-08-18 18:49:17,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 18:49:17,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 18:49:17,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 18:49:17,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 18:49:17,680 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-18 18:49:17,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:17,680 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 18:49:17,680 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 18:49:17,680 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 18:49:17,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 18:49:17,681 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:17,681 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:17,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 18:49:17,682 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:17,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:17,682 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-18 18:49:17,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:17,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [967793948] [2020-08-18 18:49:17,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:17,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:18,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:18,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:18,148 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:18,148 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [967793948] [2020-08-18 18:49:18,148 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:18,149 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 18:49:18,149 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644419153] [2020-08-18 18:49:18,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 18:49:18,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:18,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 18:49:18,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 18:49:18,150 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-18 18:49:18,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:18,480 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 18:49:18,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 18:49:18,483 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-18 18:49:18,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:18,484 INFO L225 Difference]: With dead ends: 38 [2020-08-18 18:49:18,484 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 18:49:18,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 18:49:18,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 18:49:18,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 18:49:18,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 18:49:18,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 18:49:18,489 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-18 18:49:18,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:18,490 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 18:49:18,490 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 18:49:18,490 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 18:49:18,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 18:49:18,491 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:18,491 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:18,491 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 18:49:18,491 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:18,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:18,492 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-18 18:49:18,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:18,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1657317348] [2020-08-18 18:49:18,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:18,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:18,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:18,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:18,946 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:18,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1657317348] [2020-08-18 18:49:18,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:18,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 18:49:18,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572088916] [2020-08-18 18:49:18,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 18:49:18,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:18,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 18:49:18,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 18:49:18,948 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-18 18:49:19,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:19,279 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-18 18:49:19,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 18:49:19,280 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-18 18:49:19,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:19,280 INFO L225 Difference]: With dead ends: 39 [2020-08-18 18:49:19,280 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 18:49:19,281 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 18:49:19,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 18:49:19,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 18:49:19,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 18:49:19,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-18 18:49:19,293 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-18 18:49:19,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:19,294 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-18 18:49:19,294 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 18:49:19,294 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-18 18:49:19,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 18:49:19,295 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:19,295 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:19,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 18:49:19,296 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:19,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:19,299 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-18 18:49:19,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:19,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [224586716] [2020-08-18 18:49:19,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:19,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:19,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:19,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:19,802 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:19,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [224586716] [2020-08-18 18:49:19,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:19,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 18:49:19,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414040715] [2020-08-18 18:49:19,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 18:49:19,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:19,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 18:49:19,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 18:49:19,804 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-18 18:49:20,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:20,238 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 18:49:20,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 18:49:20,239 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-18 18:49:20,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:20,240 INFO L225 Difference]: With dead ends: 40 [2020-08-18 18:49:20,240 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 18:49:20,241 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 18:49:20,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 18:49:20,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 18:49:20,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 18:49:20,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 18:49:20,245 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-18 18:49:20,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:20,246 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 18:49:20,246 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 18:49:20,246 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 18:49:20,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 18:49:20,247 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:20,247 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:20,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 18:49:20,247 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:20,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:20,248 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-18 18:49:20,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:20,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [467482447] [2020-08-18 18:49:20,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:20,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:20,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:20,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:20,828 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:20,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [467482447] [2020-08-18 18:49:20,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:20,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 18:49:20,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063741849] [2020-08-18 18:49:20,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 18:49:20,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:20,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 18:49:20,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 18:49:20,831 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-18 18:49:21,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:21,218 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 18:49:21,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 18:49:21,218 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-18 18:49:21,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:21,219 INFO L225 Difference]: With dead ends: 41 [2020-08-18 18:49:21,219 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 18:49:21,220 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 18:49:21,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 18:49:21,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 18:49:21,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 18:49:21,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-18 18:49:21,224 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-18 18:49:21,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:21,224 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-18 18:49:21,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 18:49:21,224 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-18 18:49:21,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 18:49:21,225 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:21,225 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:21,225 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 18:49:21,225 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:21,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:21,226 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-18 18:49:21,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:21,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1186789498] [2020-08-18 18:49:21,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:21,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:21,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:21,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:21,779 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:21,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1186789498] [2020-08-18 18:49:21,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:21,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 18:49:21,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210517005] [2020-08-18 18:49:21,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 18:49:21,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:21,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 18:49:21,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 18:49:21,781 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-18 18:49:22,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:22,214 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 18:49:22,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 18:49:22,214 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-18 18:49:22,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:22,215 INFO L225 Difference]: With dead ends: 42 [2020-08-18 18:49:22,215 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 18:49:22,216 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 18:49:22,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 18:49:22,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 18:49:22,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 18:49:22,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 18:49:22,226 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-18 18:49:22,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:22,226 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 18:49:22,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 18:49:22,226 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 18:49:22,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 18:49:22,227 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:22,227 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:22,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 18:49:22,228 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:22,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:22,228 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-18 18:49:22,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:22,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1550314460] [2020-08-18 18:49:22,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:22,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:22,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:22,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:22,895 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:22,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1550314460] [2020-08-18 18:49:22,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:22,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 18:49:22,903 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393611139] [2020-08-18 18:49:22,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 18:49:22,904 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:22,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 18:49:22,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 18:49:22,904 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-18 18:49:23,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:23,347 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-18 18:49:23,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 18:49:23,348 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-18 18:49:23,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:23,349 INFO L225 Difference]: With dead ends: 43 [2020-08-18 18:49:23,349 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 18:49:23,349 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 18:49:23,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 18:49:23,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 18:49:23,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 18:49:23,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 18:49:23,362 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-18 18:49:23,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:23,362 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 18:49:23,362 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 18:49:23,363 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 18:49:23,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 18:49:23,364 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:23,364 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:23,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 18:49:23,365 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:23,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:23,365 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-18 18:49:23,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:23,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [765050989] [2020-08-18 18:49:23,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:23,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:24,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:24,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:24,073 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:24,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [765050989] [2020-08-18 18:49:24,074 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:24,074 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 18:49:24,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686107848] [2020-08-18 18:49:24,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 18:49:24,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:24,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 18:49:24,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 18:49:24,078 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-18 18:49:24,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:24,544 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 18:49:24,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 18:49:24,545 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-18 18:49:24,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:24,546 INFO L225 Difference]: With dead ends: 44 [2020-08-18 18:49:24,546 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 18:49:24,547 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 18:49:24,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 18:49:24,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 18:49:24,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 18:49:24,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 18:49:24,551 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-18 18:49:24,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:24,551 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 18:49:24,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 18:49:24,552 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 18:49:24,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 18:49:24,552 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:24,552 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:24,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 18:49:24,553 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:24,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:24,553 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-18 18:49:24,553 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:24,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [760670800] [2020-08-18 18:49:24,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:24,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:25,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:25,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:25,232 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:25,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [760670800] [2020-08-18 18:49:25,233 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:25,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 18:49:25,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040356713] [2020-08-18 18:49:25,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 18:49:25,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:25,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 18:49:25,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 18:49:25,234 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-18 18:49:25,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:25,776 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-18 18:49:25,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 18:49:25,777 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-18 18:49:25,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:25,778 INFO L225 Difference]: With dead ends: 45 [2020-08-18 18:49:25,778 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 18:49:25,779 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 18:49:25,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 18:49:25,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 18:49:25,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 18:49:25,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-18 18:49:25,784 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-18 18:49:25,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:25,784 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-18 18:49:25,784 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 18:49:25,785 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-18 18:49:25,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 18:49:25,785 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:25,785 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:25,785 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 18:49:25,785 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:25,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:25,786 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-18 18:49:25,786 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:25,786 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [744710692] [2020-08-18 18:49:25,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:25,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:26,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:26,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:26,543 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:26,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [744710692] [2020-08-18 18:49:26,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:26,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 18:49:26,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660662573] [2020-08-18 18:49:26,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 18:49:26,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:26,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 18:49:26,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 18:49:26,545 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-18 18:49:27,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:27,125 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 18:49:27,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 18:49:27,126 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-18 18:49:27,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:27,127 INFO L225 Difference]: With dead ends: 46 [2020-08-18 18:49:27,127 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 18:49:27,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 18:49:27,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 18:49:27,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 18:49:27,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 18:49:27,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 18:49:27,132 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-18 18:49:27,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:27,133 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 18:49:27,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 18:49:27,133 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 18:49:27,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 18:49:27,133 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:27,133 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:27,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 18:49:27,134 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:27,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:27,134 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-18 18:49:27,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:27,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1739852019] [2020-08-18 18:49:27,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:27,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:27,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:27,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:27,887 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:27,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1739852019] [2020-08-18 18:49:27,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:27,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 18:49:27,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580080489] [2020-08-18 18:49:27,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 18:49:27,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:27,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 18:49:27,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 18:49:27,889 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-18 18:49:28,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:28,507 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 18:49:28,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 18:49:28,510 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-18 18:49:28,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:28,511 INFO L225 Difference]: With dead ends: 47 [2020-08-18 18:49:28,511 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 18:49:28,512 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 18:49:28,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 18:49:28,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 18:49:28,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 18:49:28,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-18 18:49:28,516 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-18 18:49:28,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:28,516 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-18 18:49:28,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 18:49:28,516 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-18 18:49:28,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 18:49:28,517 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:28,517 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:28,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 18:49:28,517 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:28,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:28,517 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-18 18:49:28,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:28,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [187966069] [2020-08-18 18:49:28,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:28,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:29,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:29,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:29,359 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:29,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [187966069] [2020-08-18 18:49:29,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:29,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 18:49:29,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189523997] [2020-08-18 18:49:29,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 18:49:29,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:29,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 18:49:29,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 18:49:29,361 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-18 18:49:30,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:30,042 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 18:49:30,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 18:49:30,043 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-18 18:49:30,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:30,044 INFO L225 Difference]: With dead ends: 48 [2020-08-18 18:49:30,044 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 18:49:30,045 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 18:49:30,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 18:49:30,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 18:49:30,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 18:49:30,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 18:49:30,050 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-18 18:49:30,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:30,050 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 18:49:30,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 18:49:30,050 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 18:49:30,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 18:49:30,051 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:30,051 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:30,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 18:49:30,051 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:30,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:30,052 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-18 18:49:30,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:30,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1700476656] [2020-08-18 18:49:30,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:30,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:31,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:31,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:31,096 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:31,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1700476656] [2020-08-18 18:49:31,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:31,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 18:49:31,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138865445] [2020-08-18 18:49:31,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 18:49:31,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:31,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 18:49:31,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 18:49:31,098 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-18 18:49:31,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:31,803 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-18 18:49:31,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 18:49:31,804 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-18 18:49:31,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:31,804 INFO L225 Difference]: With dead ends: 49 [2020-08-18 18:49:31,804 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 18:49:31,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 18:49:31,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 18:49:31,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 18:49:31,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 18:49:31,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 18:49:31,809 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-18 18:49:31,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:31,810 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 18:49:31,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 18:49:31,810 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 18:49:31,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 18:49:31,810 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:31,810 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:31,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 18:49:31,811 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:31,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:31,811 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-18 18:49:31,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:31,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1496677124] [2020-08-18 18:49:31,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:31,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:32,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:32,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:32,764 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:32,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1496677124] [2020-08-18 18:49:32,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:32,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 18:49:32,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477456372] [2020-08-18 18:49:32,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 18:49:32,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:32,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 18:49:32,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 18:49:32,766 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-18 18:49:33,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:33,502 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 18:49:33,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 18:49:33,502 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-18 18:49:33,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:33,503 INFO L225 Difference]: With dead ends: 50 [2020-08-18 18:49:33,503 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 18:49:33,505 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 18:49:33,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 18:49:33,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 18:49:33,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 18:49:33,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 18:49:33,509 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-18 18:49:33,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:33,510 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 18:49:33,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 18:49:33,510 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 18:49:33,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 18:49:33,510 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:33,511 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:33,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 18:49:33,511 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:33,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:33,511 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-18 18:49:33,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:33,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [78157615] [2020-08-18 18:49:33,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:33,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:34,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:34,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:34,529 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:34,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [78157615] [2020-08-18 18:49:34,530 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:34,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 18:49:34,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391652550] [2020-08-18 18:49:34,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 18:49:34,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:34,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 18:49:34,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 18:49:34,531 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-18 18:49:35,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:35,352 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-18 18:49:35,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 18:49:35,352 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-18 18:49:35,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:35,353 INFO L225 Difference]: With dead ends: 51 [2020-08-18 18:49:35,353 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 18:49:35,354 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 [2020-08-18 18:49:35,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 18:49:35,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 18:49:35,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 18:49:35,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-18 18:49:35,358 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-18 18:49:35,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:35,359 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-18 18:49:35,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 18:49:35,359 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-18 18:49:35,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 18:49:35,359 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:35,359 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:35,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 18:49:35,360 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:35,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:35,360 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-18 18:49:35,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:35,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [217500784] [2020-08-18 18:49:35,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:35,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:36,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,349 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:36,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [217500784] [2020-08-18 18:49:36,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:36,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 18:49:36,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76581431] [2020-08-18 18:49:36,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 18:49:36,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:36,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 18:49:36,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 18:49:36,351 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-18 18:49:37,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:37,204 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 18:49:37,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 18:49:37,204 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-18 18:49:37,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:37,206 INFO L225 Difference]: With dead ends: 52 [2020-08-18 18:49:37,206 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 18:49:37,206 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 [2020-08-18 18:49:37,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 18:49:37,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 18:49:37,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 18:49:37,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 18:49:37,210 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-18 18:49:37,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:37,210 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 18:49:37,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 18:49:37,210 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 18:49:37,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 18:49:37,211 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:37,211 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:37,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 18:49:37,211 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:37,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:37,212 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-18 18:49:37,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:37,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [761224419] [2020-08-18 18:49:37,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:37,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:38,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:38,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:38,279 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:38,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [761224419] [2020-08-18 18:49:38,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:38,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 18:49:38,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476126145] [2020-08-18 18:49:38,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 18:49:38,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:38,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 18:49:38,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 18:49:38,281 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-18 18:49:39,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:39,185 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 18:49:39,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 18:49:39,186 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-18 18:49:39,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:39,186 INFO L225 Difference]: With dead ends: 53 [2020-08-18 18:49:39,186 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 18:49:39,187 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 18:49:39,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 18:49:39,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 18:49:39,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 18:49:39,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-18 18:49:39,191 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-18 18:49:39,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:39,191 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-18 18:49:39,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 18:49:39,191 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-18 18:49:39,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 18:49:39,192 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:39,192 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:39,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 18:49:39,192 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:39,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:39,192 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-18 18:49:39,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:39,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574719610] [2020-08-18 18:49:39,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:39,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:40,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:40,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:40,319 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:40,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574719610] [2020-08-18 18:49:40,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:40,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 18:49:40,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729135517] [2020-08-18 18:49:40,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 18:49:40,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:40,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 18:49:40,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 18:49:40,321 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-18 18:49:41,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:41,287 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 18:49:41,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 18:49:41,288 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-18 18:49:41,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:41,289 INFO L225 Difference]: With dead ends: 54 [2020-08-18 18:49:41,289 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 18:49:41,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 18:49:41,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 18:49:41,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 18:49:41,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 18:49:41,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 18:49:41,294 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-18 18:49:41,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:41,295 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 18:49:41,295 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 18:49:41,295 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 18:49:41,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 18:49:41,295 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:41,295 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:41,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 18:49:41,295 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:41,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:41,296 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-18 18:49:41,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:41,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1296009802] [2020-08-18 18:49:41,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:41,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:42,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:42,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:42,462 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:42,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1296009802] [2020-08-18 18:49:42,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:42,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 18:49:42,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147259277] [2020-08-18 18:49:42,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 18:49:42,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:42,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 18:49:42,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 18:49:42,464 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-18 18:49:43,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:43,480 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-18 18:49:43,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 18:49:43,480 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-18 18:49:43,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:43,481 INFO L225 Difference]: With dead ends: 55 [2020-08-18 18:49:43,481 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 18:49:43,482 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 [2020-08-18 18:49:43,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 18:49:43,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-18 18:49:43,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 18:49:43,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-18 18:49:43,486 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-18 18:49:43,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:43,487 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-18 18:49:43,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 18:49:43,487 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-18 18:49:43,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 18:49:43,487 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:43,487 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:43,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 18:49:43,488 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:43,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:43,488 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-18 18:49:43,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:43,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1143992916] [2020-08-18 18:49:43,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:43,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:44,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:44,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:44,989 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:44,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1143992916] [2020-08-18 18:49:44,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:44,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 18:49:44,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92163238] [2020-08-18 18:49:44,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 18:49:44,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:44,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 18:49:44,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 18:49:44,993 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-18 18:49:46,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:46,029 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 18:49:46,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 18:49:46,030 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-18 18:49:46,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:46,031 INFO L225 Difference]: With dead ends: 56 [2020-08-18 18:49:46,031 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 18:49:46,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 18:49:46,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 18:49:46,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-18 18:49:46,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 18:49:46,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 18:49:46,036 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-18 18:49:46,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:46,036 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 18:49:46,036 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 18:49:46,036 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 18:49:46,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 18:49:46,037 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:46,037 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:46,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 18:49:46,037 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:46,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:46,038 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-18 18:49:46,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:46,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1004409456] [2020-08-18 18:49:46,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:46,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:47,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:47,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:47,239 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:47,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1004409456] [2020-08-18 18:49:47,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:47,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 18:49:47,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635662504] [2020-08-18 18:49:47,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 18:49:47,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:47,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 18:49:47,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 18:49:47,242 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-18 18:49:48,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:48,271 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-18 18:49:48,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 18:49:48,274 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-18 18:49:48,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:48,274 INFO L225 Difference]: With dead ends: 57 [2020-08-18 18:49:48,274 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 18:49:48,275 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 18:49:48,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 18:49:48,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 18:49:48,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 18:49:48,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-18 18:49:48,280 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-18 18:49:48,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:48,280 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-18 18:49:48,280 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 18:49:48,280 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-18 18:49:48,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 18:49:48,281 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:48,281 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:48,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 18:49:48,281 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:48,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:48,282 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-18 18:49:48,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:48,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2141198124] [2020-08-18 18:49:48,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:48,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:49,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:49,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:49,674 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:49,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2141198124] [2020-08-18 18:49:49,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:49,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 18:49:49,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799124827] [2020-08-18 18:49:49,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 18:49:49,675 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:49,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 18:49:49,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 18:49:49,676 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-18 18:49:50,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:50,873 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 18:49:50,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 18:49:50,874 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-18 18:49:50,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:50,875 INFO L225 Difference]: With dead ends: 58 [2020-08-18 18:49:50,875 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 18:49:50,876 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 18:49:50,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 18:49:50,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-18 18:49:50,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 18:49:50,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 18:49:50,880 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-18 18:49:50,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:50,880 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 18:49:50,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 18:49:50,880 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 18:49:50,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 18:49:50,881 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:50,881 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:50,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 18:49:50,881 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:50,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:50,882 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-18 18:49:50,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:50,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1529478755] [2020-08-18 18:49:50,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:50,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:52,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:52,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:52,303 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:52,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1529478755] [2020-08-18 18:49:52,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:52,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 18:49:52,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116833023] [2020-08-18 18:49:52,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 18:49:52,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:52,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 18:49:52,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 18:49:52,305 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-18 18:49:53,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:53,565 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-18 18:49:53,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 18:49:53,568 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-18 18:49:53,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:53,568 INFO L225 Difference]: With dead ends: 59 [2020-08-18 18:49:53,568 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 18:49:53,569 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 [2020-08-18 18:49:53,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 18:49:53,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-18 18:49:53,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 18:49:53,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-18 18:49:53,573 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-18 18:49:53,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:53,574 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-18 18:49:53,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 18:49:53,574 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-18 18:49:53,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 18:49:53,574 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:53,575 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:53,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 18:49:53,575 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:53,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:53,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-18 18:49:53,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:53,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1180141603] [2020-08-18 18:49:53,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:53,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:55,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:55,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:55,066 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:55,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1180141603] [2020-08-18 18:49:55,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:55,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 18:49:55,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736816403] [2020-08-18 18:49:55,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 18:49:55,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:55,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 18:49:55,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 18:49:55,069 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-18 18:49:56,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:56,370 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 18:49:56,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 18:49:56,371 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-18 18:49:56,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:56,371 INFO L225 Difference]: With dead ends: 60 [2020-08-18 18:49:56,371 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 18:49:56,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 18:49:56,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 18:49:56,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 18:49:56,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 18:49:56,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 18:49:56,375 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-18 18:49:56,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:56,375 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 18:49:56,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 18:49:56,376 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 18:49:56,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 18:49:56,376 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:56,376 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:56,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 18:49:56,377 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:56,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:56,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-18 18:49:56,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:56,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [158507781] [2020-08-18 18:49:56,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:56,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:57,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:57,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:57,888 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:57,888 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [158507781] [2020-08-18 18:49:57,889 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:57,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 18:49:57,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258133789] [2020-08-18 18:49:57,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 18:49:57,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:57,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 18:49:57,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 18:49:57,890 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-18 18:49:59,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:59,257 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-18 18:49:59,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 18:49:59,257 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-18 18:49:59,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:59,258 INFO L225 Difference]: With dead ends: 61 [2020-08-18 18:49:59,258 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 18:49:59,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 18:49:59,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 18:49:59,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-18 18:49:59,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 18:49:59,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-18 18:49:59,264 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-18 18:49:59,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:59,264 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-18 18:49:59,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 18:49:59,264 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-18 18:49:59,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 18:49:59,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:59,265 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:59,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 18:49:59,266 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:59,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:59,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-18 18:49:59,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:59,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [506814086] [2020-08-18 18:49:59,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:59,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:00,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:50:00,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:00,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:50:00,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [506814086] [2020-08-18 18:50:00,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:50:00,911 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 18:50:00,911 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795144155] [2020-08-18 18:50:00,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 18:50:00,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:50:00,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 18:50:00,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 18:50:00,912 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-18 18:50:02,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:50:02,334 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 18:50:02,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 18:50:02,335 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-18 18:50:02,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:50:02,336 INFO L225 Difference]: With dead ends: 62 [2020-08-18 18:50:02,336 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 18:50:02,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 18:50:02,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 18:50:02,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 18:50:02,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 18:50:02,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 18:50:02,341 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-18 18:50:02,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:50:02,341 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 18:50:02,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 18:50:02,341 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 18:50:02,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 18:50:02,341 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:50:02,341 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:50:02,342 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 18:50:02,342 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:50:02,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:50:02,342 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-18 18:50:02,342 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:50:02,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490445789] [2020-08-18 18:50:02,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:50:02,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:04,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:50:04,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:04,057 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:50:04,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490445789] [2020-08-18 18:50:04,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:50:04,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 18:50:04,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428161451] [2020-08-18 18:50:04,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 18:50:04,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:50:04,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 18:50:04,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 18:50:04,062 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-18 18:50:05,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:50:05,634 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-18 18:50:05,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 18:50:05,635 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-18 18:50:05,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:50:05,636 INFO L225 Difference]: With dead ends: 63 [2020-08-18 18:50:05,636 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 18:50:05,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 18:50:05,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 18:50:05,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 18:50:05,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 18:50:05,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-18 18:50:05,640 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-18 18:50:05,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:50:05,640 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-18 18:50:05,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 18:50:05,641 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-18 18:50:05,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 18:50:05,641 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:50:05,641 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:50:05,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 18:50:05,642 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:50:05,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:50:05,642 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-18 18:50:05,642 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:50:05,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [537668911] [2020-08-18 18:50:05,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:50:05,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:07,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:50:07,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:07,435 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:50:07,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [537668911] [2020-08-18 18:50:07,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:50:07,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 18:50:07,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802820251] [2020-08-18 18:50:07,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 18:50:07,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:50:07,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 18:50:07,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 18:50:07,443 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states.