/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 19:04:30,768 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 19:04:30,771 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 19:04:30,812 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 19:04:30,813 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 19:04:30,822 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 19:04:30,824 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 19:04:30,828 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 19:04:30,830 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 19:04:30,833 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 19:04:30,834 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 19:04:30,835 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 19:04:30,836 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 19:04:30,838 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 19:04:30,841 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 19:04:30,842 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 19:04:30,844 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 19:04:30,845 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 19:04:30,846 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 19:04:30,854 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 19:04:30,856 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 19:04:30,857 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 19:04:30,858 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 19:04:30,859 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 19:04:30,871 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 19:04:30,871 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 19:04:30,872 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 19:04:30,872 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 19:04:30,878 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 19:04:30,879 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 19:04:30,879 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 19:04:30,882 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 19:04:30,885 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 19:04:30,886 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 19:04:30,887 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 19:04:30,887 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 19:04:30,887 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 19:04:30,888 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 19:04:30,890 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 19:04:30,891 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 19:04:30,891 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 19:04:30,892 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 19:04:30,931 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 19:04:30,932 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 19:04:30,934 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 19:04:30,934 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 19:04:30,934 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 19:04:30,935 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 19:04:30,935 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 19:04:30,935 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 19:04:30,935 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 19:04:30,936 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 19:04:30,937 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 19:04:30,937 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 19:04:30,937 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 19:04:30,938 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 19:04:30,938 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 19:04:30,938 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 19:04:30,938 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 19:04:30,938 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 19:04:30,939 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 19:04:30,939 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 19:04:30,939 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 19:04:30,939 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:04:30,940 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 19:04:30,940 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 19:04:30,940 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 19:04:30,940 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 19:04:30,940 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 19:04:30,941 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 19:04:30,941 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 19:04:30,941 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-21 19:04:31,216 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 19:04:31,227 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 19:04:31,232 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 19:04:31,234 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 19:04:31,235 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 19:04:31,236 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-21 19:04:31,289 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f456f39eb/6b0eccd88d294daabeaf185c0ef75928/FLAGac8d542bf [2020-08-21 19:04:31,753 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 19:04:31,754 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-21 19:04:31,761 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f456f39eb/6b0eccd88d294daabeaf185c0ef75928/FLAGac8d542bf [2020-08-21 19:04:32,123 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f456f39eb/6b0eccd88d294daabeaf185c0ef75928 [2020-08-21 19:04:32,134 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 19:04:32,136 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 19:04:32,138 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 19:04:32,138 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 19:04:32,142 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 19:04:32,143 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:04:32" (1/1) ... [2020-08-21 19:04:32,147 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6317371b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:32, skipping insertion in model container [2020-08-21 19:04:32,147 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:04:32" (1/1) ... [2020-08-21 19:04:32,155 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 19:04:32,176 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 19:04:32,396 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:04:32,401 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 19:04:32,421 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:04:32,442 INFO L208 MainTranslator]: Completed translation [2020-08-21 19:04:32,447 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:32 WrapperNode [2020-08-21 19:04:32,447 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 19:04:32,448 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 19:04:32,448 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 19:04:32,448 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 19:04:32,568 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:32" (1/1) ... [2020-08-21 19:04:32,569 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:32" (1/1) ... [2020-08-21 19:04:32,579 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:32" (1/1) ... [2020-08-21 19:04:32,579 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:32" (1/1) ... [2020-08-21 19:04:32,585 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:32" (1/1) ... [2020-08-21 19:04:32,589 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:32" (1/1) ... [2020-08-21 19:04:32,590 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:32" (1/1) ... [2020-08-21 19:04:32,592 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 19:04:32,592 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 19:04:32,593 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 19:04:32,593 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 19:04:32,594 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:32" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:04:32,659 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 19:04:32,659 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 19:04:32,659 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 19:04:32,659 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 19:04:32,660 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 19:04:32,660 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 19:04:32,660 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 19:04:32,660 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 19:04:32,660 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 19:04:32,660 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 19:04:32,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 19:04:32,661 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 19:04:32,661 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 19:04:32,906 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 19:04:32,917 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 19:04:32,928 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:04:32 BoogieIcfgContainer [2020-08-21 19:04:32,928 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 19:04:32,929 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 19:04:32,929 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 19:04:32,937 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 19:04:32,938 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:04:32" (1/3) ... [2020-08-21 19:04:32,939 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74fcc17 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:04:32, skipping insertion in model container [2020-08-21 19:04:32,939 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:32" (2/3) ... [2020-08-21 19:04:32,939 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74fcc17 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:04:32, skipping insertion in model container [2020-08-21 19:04:32,940 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:04:32" (3/3) ... [2020-08-21 19:04:32,942 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-08-21 19:04:32,969 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 19:04:32,979 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 19:04:32,994 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 19:04:33,020 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 19:04:33,020 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 19:04:33,020 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 19:04:33,020 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 19:04:33,020 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 19:04:33,020 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 19:04:33,021 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 19:04:33,021 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 19:04:33,040 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-21 19:04:33,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 19:04:33,047 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:33,048 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:33,049 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:33,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:33,055 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-08-21 19:04:33,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:33,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [440591563] [2020-08-21 19:04:33,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:33,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:33,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:33,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:33,237 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:33,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [440591563] [2020-08-21 19:04:33,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:04:33,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 19:04:33,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625288893] [2020-08-21 19:04:33,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 19:04:33,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:33,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 19:04:33,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:04:33,257 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-08-21 19:04:33,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:33,331 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-08-21 19:04:33,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 19:04:33,334 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-08-21 19:04:33,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:33,342 INFO L225 Difference]: With dead ends: 34 [2020-08-21 19:04:33,342 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 19:04:33,345 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:04:33,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 19:04:33,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 19:04:33,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 19:04:33,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 19:04:33,378 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 19:04:33,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:33,379 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 19:04:33,379 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 19:04:33,379 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 19:04:33,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 19:04:33,380 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:33,380 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:33,380 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 19:04:33,381 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:33,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:33,381 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-08-21 19:04:33,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:33,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1107183558] [2020-08-21 19:04:33,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:33,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:33,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:33,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:33,465 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:33,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1107183558] [2020-08-21 19:04:33,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:04:33,466 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 19:04:33,467 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391428834] [2020-08-21 19:04:33,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:04:33,468 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:33,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:04:33,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:04:33,469 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2020-08-21 19:04:33,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:33,511 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 19:04:33,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:04:33,512 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-21 19:04:33,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:33,513 INFO L225 Difference]: With dead ends: 22 [2020-08-21 19:04:33,514 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 19:04:33,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:04:33,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 19:04:33,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-21 19:04:33,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 19:04:33,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 19:04:33,520 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-21 19:04:33,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:33,521 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 19:04:33,521 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 19:04:33,521 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 19:04:33,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 19:04:33,522 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:33,522 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:33,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 19:04:33,523 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:33,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:33,523 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-08-21 19:04:33,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:33,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1700950200] [2020-08-21 19:04:33,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:33,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:33,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:33,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:33,596 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:33,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1700950200] [2020-08-21 19:04:33,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:33,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 19:04:33,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016993974] [2020-08-21 19:04:33,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:04:33,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:33,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:04:33,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:04:33,600 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-21 19:04:33,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:33,647 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 19:04:33,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:04:33,648 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-21 19:04:33,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:33,649 INFO L225 Difference]: With dead ends: 24 [2020-08-21 19:04:33,649 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 19:04:33,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:04:33,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 19:04:33,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-21 19:04:33,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 19:04:33,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 19:04:33,656 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-21 19:04:33,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:33,657 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 19:04:33,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:04:33,657 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 19:04:33,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 19:04:33,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:33,658 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:33,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 19:04:33,659 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:33,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:33,659 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2020-08-21 19:04:33,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:33,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [354739835] [2020-08-21 19:04:33,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:33,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:33,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:33,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:33,752 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:33,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [354739835] [2020-08-21 19:04:33,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:33,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 19:04:33,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324829555] [2020-08-21 19:04:33,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:04:33,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:33,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:04:33,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:04:33,755 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-21 19:04:33,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:33,811 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 19:04:33,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 19:04:33,811 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-21 19:04:33,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:33,812 INFO L225 Difference]: With dead ends: 26 [2020-08-21 19:04:33,812 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 19:04:33,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:04:33,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 19:04:33,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-21 19:04:33,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 19:04:33,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 19:04:33,819 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-21 19:04:33,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:33,819 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 19:04:33,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:04:33,820 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 19:04:33,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 19:04:33,820 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:33,821 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:33,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 19:04:33,821 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:33,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:33,822 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2020-08-21 19:04:33,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:33,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557128552] [2020-08-21 19:04:33,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:33,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:33,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:33,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:33,900 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:33,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557128552] [2020-08-21 19:04:33,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:33,902 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 19:04:33,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959643193] [2020-08-21 19:04:33,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 19:04:33,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:33,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 19:04:33,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:04:33,904 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-21 19:04:33,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:33,972 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 19:04:33,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:04:33,973 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-21 19:04:33,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:33,974 INFO L225 Difference]: With dead ends: 28 [2020-08-21 19:04:33,974 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 19:04:33,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:04:33,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 19:04:33,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 19:04:33,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 19:04:33,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 19:04:33,981 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-21 19:04:33,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:33,981 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 19:04:33,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 19:04:33,982 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 19:04:33,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 19:04:33,983 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:33,983 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:33,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 19:04:33,983 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:33,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:33,984 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2020-08-21 19:04:33,984 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:33,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2093774142] [2020-08-21 19:04:33,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:34,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:34,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:34,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:34,091 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:34,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2093774142] [2020-08-21 19:04:34,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:34,092 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 19:04:34,092 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502675572] [2020-08-21 19:04:34,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 19:04:34,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:34,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 19:04:34,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:04:34,094 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-21 19:04:34,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:34,153 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 19:04:34,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 19:04:34,153 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-21 19:04:34,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:34,154 INFO L225 Difference]: With dead ends: 30 [2020-08-21 19:04:34,154 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 19:04:34,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:04:34,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 19:04:34,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 19:04:34,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 19:04:34,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 19:04:34,161 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-21 19:04:34,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:34,161 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 19:04:34,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 19:04:34,161 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 19:04:34,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 19:04:34,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:34,162 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:34,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 19:04:34,163 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:34,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:34,163 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2020-08-21 19:04:34,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:34,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1507410960] [2020-08-21 19:04:34,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:34,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:34,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:34,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:34,248 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:34,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1507410960] [2020-08-21 19:04:34,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:34,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 19:04:34,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846313333] [2020-08-21 19:04:34,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 19:04:34,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:34,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 19:04:34,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:04:34,251 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-21 19:04:34,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:34,310 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 19:04:34,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 19:04:34,310 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-21 19:04:34,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:34,311 INFO L225 Difference]: With dead ends: 32 [2020-08-21 19:04:34,312 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 19:04:34,312 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:04:34,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 19:04:34,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 19:04:34,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 19:04:34,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 19:04:34,318 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-21 19:04:34,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:34,318 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 19:04:34,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 19:04:34,319 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 19:04:34,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 19:04:34,319 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:34,320 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:34,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 19:04:34,320 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:34,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:34,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2020-08-21 19:04:34,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:34,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1773093085] [2020-08-21 19:04:34,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:34,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:34,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:34,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:34,418 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:34,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1773093085] [2020-08-21 19:04:34,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:34,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 19:04:34,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334098833] [2020-08-21 19:04:34,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 19:04:34,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:34,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 19:04:34,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:04:34,420 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-21 19:04:34,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:34,490 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 19:04:34,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 19:04:34,491 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-21 19:04:34,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:34,491 INFO L225 Difference]: With dead ends: 34 [2020-08-21 19:04:34,492 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 19:04:34,492 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:04:34,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 19:04:34,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 19:04:34,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 19:04:34,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 19:04:34,498 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-21 19:04:34,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:34,498 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 19:04:34,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 19:04:34,498 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 19:04:34,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 19:04:34,499 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:34,499 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:34,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 19:04:34,500 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:34,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:34,500 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2020-08-21 19:04:34,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:34,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [902934611] [2020-08-21 19:04:34,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:34,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:34,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:34,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:34,600 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:34,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [902934611] [2020-08-21 19:04:34,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:34,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 19:04:34,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429754484] [2020-08-21 19:04:34,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 19:04:34,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:34,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 19:04:34,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:04:34,603 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 11 states. [2020-08-21 19:04:34,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:34,677 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 19:04:34,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 19:04:34,678 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2020-08-21 19:04:34,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:34,678 INFO L225 Difference]: With dead ends: 36 [2020-08-21 19:04:34,679 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 19:04:34,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:04:34,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 19:04:34,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 19:04:34,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 19:04:34,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 19:04:34,685 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-21 19:04:34,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:34,685 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 19:04:34,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 19:04:34,685 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 19:04:34,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 19:04:34,686 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:34,687 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:34,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 19:04:34,687 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:34,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:34,687 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2020-08-21 19:04:34,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:34,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [303328502] [2020-08-21 19:04:34,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:34,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:34,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:34,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:34,819 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:34,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [303328502] [2020-08-21 19:04:34,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:34,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 19:04:34,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810701031] [2020-08-21 19:04:34,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 19:04:34,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:34,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 19:04:34,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:04:34,822 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 12 states. [2020-08-21 19:04:34,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:34,905 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 19:04:34,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 19:04:34,906 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-08-21 19:04:34,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:34,907 INFO L225 Difference]: With dead ends: 38 [2020-08-21 19:04:34,907 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 19:04:34,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:04:34,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 19:04:34,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 19:04:34,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 19:04:34,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 19:04:34,914 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-08-21 19:04:34,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:34,914 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 19:04:34,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 19:04:34,915 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 19:04:34,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 19:04:34,915 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:34,916 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:34,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 19:04:34,916 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:34,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:34,917 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2020-08-21 19:04:34,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:34,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1720913966] [2020-08-21 19:04:34,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:34,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:35,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:35,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:35,073 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:35,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1720913966] [2020-08-21 19:04:35,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:35,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 19:04:35,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177156012] [2020-08-21 19:04:35,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 19:04:35,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:35,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 19:04:35,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:04:35,077 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 13 states. [2020-08-21 19:04:35,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:35,162 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 19:04:35,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 19:04:35,163 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-08-21 19:04:35,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:35,164 INFO L225 Difference]: With dead ends: 40 [2020-08-21 19:04:35,164 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 19:04:35,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:04:35,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 19:04:35,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 19:04:35,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 19:04:35,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 19:04:35,173 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-08-21 19:04:35,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:35,173 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 19:04:35,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 19:04:35,174 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 19:04:35,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 19:04:35,178 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:35,178 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:35,179 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 19:04:35,179 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:35,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:35,179 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2020-08-21 19:04:35,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:35,180 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1684296270] [2020-08-21 19:04:35,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:35,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:35,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:35,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:35,367 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:35,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1684296270] [2020-08-21 19:04:35,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:35,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 19:04:35,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067440526] [2020-08-21 19:04:35,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 19:04:35,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:35,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 19:04:35,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 19:04:35,370 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-08-21 19:04:35,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:35,444 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 19:04:35,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 19:04:35,445 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-08-21 19:04:35,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:35,445 INFO L225 Difference]: With dead ends: 42 [2020-08-21 19:04:35,446 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 19:04:35,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 19:04:35,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 19:04:35,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 19:04:35,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 19:04:35,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 19:04:35,454 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-08-21 19:04:35,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:35,454 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 19:04:35,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 19:04:35,454 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 19:04:35,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 19:04:35,455 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:35,455 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:35,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 19:04:35,456 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:35,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:35,456 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2020-08-21 19:04:35,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:35,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1128940318] [2020-08-21 19:04:35,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:35,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:35,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:35,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:35,602 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:35,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1128940318] [2020-08-21 19:04:35,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:35,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 19:04:35,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176295264] [2020-08-21 19:04:35,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 19:04:35,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:35,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 19:04:35,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:04:35,605 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 15 states. [2020-08-21 19:04:35,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:35,677 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 19:04:35,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 19:04:35,678 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2020-08-21 19:04:35,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:35,679 INFO L225 Difference]: With dead ends: 44 [2020-08-21 19:04:35,679 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 19:04:35,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:04:35,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 19:04:35,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 19:04:35,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 19:04:35,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 19:04:35,687 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-08-21 19:04:35,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:35,687 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 19:04:35,687 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 19:04:35,687 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 19:04:35,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 19:04:35,689 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:35,689 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:35,689 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 19:04:35,689 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:35,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:35,690 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2020-08-21 19:04:35,690 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:35,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1477010646] [2020-08-21 19:04:35,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:35,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:35,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:35,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:35,907 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:35,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1477010646] [2020-08-21 19:04:35,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:35,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 19:04:35,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415607630] [2020-08-21 19:04:35,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 19:04:35,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:35,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 19:04:35,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:04:35,911 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 16 states. [2020-08-21 19:04:35,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:35,982 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 19:04:35,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 19:04:35,982 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-08-21 19:04:35,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:35,983 INFO L225 Difference]: With dead ends: 46 [2020-08-21 19:04:35,983 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 19:04:35,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:04:35,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 19:04:35,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 19:04:35,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 19:04:35,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 19:04:35,997 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-08-21 19:04:35,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:35,997 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 19:04:35,997 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 19:04:35,997 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 19:04:35,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 19:04:35,999 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:35,999 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:35,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 19:04:35,999 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:35,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:35,999 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2020-08-21 19:04:36,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:36,000 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877153292] [2020-08-21 19:04:36,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:36,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:36,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:36,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:36,212 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:36,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877153292] [2020-08-21 19:04:36,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:36,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 19:04:36,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829168220] [2020-08-21 19:04:36,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 19:04:36,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:36,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 19:04:36,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:04:36,215 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 17 states. [2020-08-21 19:04:36,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:36,331 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 19:04:36,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 19:04:36,332 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-08-21 19:04:36,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:36,333 INFO L225 Difference]: With dead ends: 48 [2020-08-21 19:04:36,333 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 19:04:36,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:04:36,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 19:04:36,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 19:04:36,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 19:04:36,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 19:04:36,344 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-08-21 19:04:36,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:36,345 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 19:04:36,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 19:04:36,345 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 19:04:36,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 19:04:36,346 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:36,346 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:36,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 19:04:36,346 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:36,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:36,347 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2020-08-21 19:04:36,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:36,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1748716543] [2020-08-21 19:04:36,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:36,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:36,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:36,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:36,528 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:36,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1748716543] [2020-08-21 19:04:36,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:36,531 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 19:04:36,531 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409480961] [2020-08-21 19:04:36,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 19:04:36,532 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:36,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 19:04:36,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 19:04:36,532 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 18 states. [2020-08-21 19:04:36,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:36,634 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 19:04:36,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 19:04:36,635 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-21 19:04:36,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:36,635 INFO L225 Difference]: With dead ends: 50 [2020-08-21 19:04:36,635 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 19:04:36,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 19:04:36,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 19:04:36,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 19:04:36,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 19:04:36,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 19:04:36,646 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-08-21 19:04:36,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:36,646 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 19:04:36,646 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 19:04:36,646 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 19:04:36,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 19:04:36,647 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:36,647 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:36,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 19:04:36,647 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:36,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:36,648 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2020-08-21 19:04:36,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:36,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [498272199] [2020-08-21 19:04:36,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:36,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:36,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:36,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:36,887 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:36,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [498272199] [2020-08-21 19:04:36,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:36,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 19:04:36,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640884452] [2020-08-21 19:04:36,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 19:04:36,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:36,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 19:04:36,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:04:36,889 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 19 states. [2020-08-21 19:04:37,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:37,018 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 19:04:37,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 19:04:37,019 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2020-08-21 19:04:37,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:37,019 INFO L225 Difference]: With dead ends: 52 [2020-08-21 19:04:37,020 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 19:04:37,020 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:04:37,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 19:04:37,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 19:04:37,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 19:04:37,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 19:04:37,025 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-08-21 19:04:37,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:37,025 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 19:04:37,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 19:04:37,025 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 19:04:37,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 19:04:37,026 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:37,026 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:37,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 19:04:37,027 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:37,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:37,027 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2020-08-21 19:04:37,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:37,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1598810160] [2020-08-21 19:04:37,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:37,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:37,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:37,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:37,262 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:37,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1598810160] [2020-08-21 19:04:37,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:37,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 19:04:37,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662638041] [2020-08-21 19:04:37,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 19:04:37,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:37,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 19:04:37,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 19:04:37,264 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 20 states. [2020-08-21 19:04:37,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:37,390 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 19:04:37,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 19:04:37,390 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2020-08-21 19:04:37,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:37,392 INFO L225 Difference]: With dead ends: 54 [2020-08-21 19:04:37,392 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 19:04:37,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 19:04:37,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 19:04:37,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-21 19:04:37,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 19:04:37,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 19:04:37,399 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-08-21 19:04:37,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:37,399 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 19:04:37,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 19:04:37,399 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 19:04:37,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 19:04:37,400 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:37,400 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:37,400 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 19:04:37,401 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:37,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:37,401 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2020-08-21 19:04:37,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:37,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1428997072] [2020-08-21 19:04:37,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:37,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:37,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:37,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:37,646 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:37,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1428997072] [2020-08-21 19:04:37,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:37,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 19:04:37,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884647470] [2020-08-21 19:04:37,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 19:04:37,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:37,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 19:04:37,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:04:37,648 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 21 states. [2020-08-21 19:04:37,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:37,761 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 19:04:37,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 19:04:37,768 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2020-08-21 19:04:37,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:37,769 INFO L225 Difference]: With dead ends: 56 [2020-08-21 19:04:37,769 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 19:04:37,770 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:04:37,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 19:04:37,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-21 19:04:37,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 19:04:37,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 19:04:37,774 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-08-21 19:04:37,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:37,774 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 19:04:37,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 19:04:37,775 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 19:04:37,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 19:04:37,775 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:37,775 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:37,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 19:04:37,776 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:37,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:37,776 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2020-08-21 19:04:37,776 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:37,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2023831000] [2020-08-21 19:04:37,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:37,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:38,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:38,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:38,059 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:38,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2023831000] [2020-08-21 19:04:38,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:38,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 19:04:38,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806424996] [2020-08-21 19:04:38,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 19:04:38,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:38,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 19:04:38,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 19:04:38,062 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 22 states. [2020-08-21 19:04:38,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:38,135 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 19:04:38,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 19:04:38,136 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2020-08-21 19:04:38,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:38,137 INFO L225 Difference]: With dead ends: 58 [2020-08-21 19:04:38,137 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 19:04:38,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 19:04:38,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 19:04:38,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 19:04:38,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 19:04:38,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 19:04:38,142 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-08-21 19:04:38,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:38,142 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 19:04:38,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 19:04:38,142 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 19:04:38,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 19:04:38,143 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:38,143 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:38,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 19:04:38,144 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:38,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:38,144 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2020-08-21 19:04:38,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:38,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [481044445] [2020-08-21 19:04:38,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:38,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:38,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:38,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:38,454 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:38,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [481044445] [2020-08-21 19:04:38,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:38,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 19:04:38,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227190265] [2020-08-21 19:04:38,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 19:04:38,457 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:38,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 19:04:38,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:04:38,458 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 23 states. [2020-08-21 19:04:38,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:38,598 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 19:04:38,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 19:04:38,599 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2020-08-21 19:04:38,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:38,600 INFO L225 Difference]: With dead ends: 60 [2020-08-21 19:04:38,600 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 19:04:38,601 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:04:38,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 19:04:38,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 19:04:38,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 19:04:38,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 19:04:38,611 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-08-21 19:04:38,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:38,611 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 19:04:38,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 19:04:38,612 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 19:04:38,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 19:04:38,613 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:38,613 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:38,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 19:04:38,613 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:38,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:38,614 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2020-08-21 19:04:38,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:38,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [786563781] [2020-08-21 19:04:38,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:38,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:38,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:38,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:38,963 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:38,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [786563781] [2020-08-21 19:04:38,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:38,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 19:04:38,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384244850] [2020-08-21 19:04:38,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 19:04:38,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:38,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 19:04:38,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-21 19:04:38,966 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 24 states. [2020-08-21 19:04:39,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:39,055 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 19:04:39,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 19:04:39,058 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 52 [2020-08-21 19:04:39,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:39,059 INFO L225 Difference]: With dead ends: 62 [2020-08-21 19:04:39,059 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 19:04:39,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-21 19:04:39,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 19:04:39,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 19:04:39,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 19:04:39,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 19:04:39,069 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-08-21 19:04:39,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:39,070 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 19:04:39,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 19:04:39,070 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 19:04:39,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 19:04:39,071 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:39,071 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:39,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 19:04:39,072 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:39,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:39,073 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2020-08-21 19:04:39,073 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:39,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1790044311] [2020-08-21 19:04:39,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:39,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:39,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:39,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:39,439 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:39,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1790044311] [2020-08-21 19:04:39,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:39,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 19:04:39,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745294508] [2020-08-21 19:04:39,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 19:04:39,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:39,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 19:04:39,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-21 19:04:39,447 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 25 states. [2020-08-21 19:04:39,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:39,554 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-21 19:04:39,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 19:04:39,555 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2020-08-21 19:04:39,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:39,556 INFO L225 Difference]: With dead ends: 64 [2020-08-21 19:04:39,556 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 19:04:39,556 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-21 19:04:39,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 19:04:39,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 19:04:39,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 19:04:39,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 19:04:39,566 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-08-21 19:04:39,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:39,566 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 19:04:39,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 19:04:39,566 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 19:04:39,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 19:04:39,570 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:39,570 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:39,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 19:04:39,571 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:39,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:39,571 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2020-08-21 19:04:39,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:39,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267822641] [2020-08-21 19:04:39,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:39,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:39,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:39,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:39,949 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:39,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267822641] [2020-08-21 19:04:39,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:39,950 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 19:04:39,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080202233] [2020-08-21 19:04:39,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 19:04:39,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:39,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 19:04:39,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-21 19:04:39,952 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 26 states. [2020-08-21 19:04:40,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:40,092 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-08-21 19:04:40,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 19:04:40,093 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 56 [2020-08-21 19:04:40,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:40,093 INFO L225 Difference]: With dead ends: 66 [2020-08-21 19:04:40,094 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 19:04:40,094 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-21 19:04:40,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 19:04:40,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 19:04:40,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 19:04:40,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-21 19:04:40,099 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-08-21 19:04:40,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:40,099 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-21 19:04:40,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 19:04:40,100 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-21 19:04:40,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 19:04:40,100 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:40,101 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:40,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 19:04:40,104 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:40,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:40,104 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2020-08-21 19:04:40,105 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:40,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1144585225] [2020-08-21 19:04:40,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:40,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:40,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:40,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:40,536 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:40,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1144585225] [2020-08-21 19:04:40,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:40,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 19:04:40,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477412931] [2020-08-21 19:04:40,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 19:04:40,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:40,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 19:04:40,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-21 19:04:40,538 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 27 states. [2020-08-21 19:04:40,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:40,689 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-08-21 19:04:40,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 19:04:40,689 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 58 [2020-08-21 19:04:40,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:40,690 INFO L225 Difference]: With dead ends: 68 [2020-08-21 19:04:40,690 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 19:04:40,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-21 19:04:40,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 19:04:40,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 19:04:40,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 19:04:40,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-08-21 19:04:40,694 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-08-21 19:04:40,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:40,695 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-08-21 19:04:40,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 19:04:40,695 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-08-21 19:04:40,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 19:04:40,696 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:40,696 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:40,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 19:04:40,696 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:40,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:40,697 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2020-08-21 19:04:40,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:40,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1893883404] [2020-08-21 19:04:40,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:40,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:41,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:41,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:41,141 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:41,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1893883404] [2020-08-21 19:04:41,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:41,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 19:04:41,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386524091] [2020-08-21 19:04:41,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 19:04:41,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:41,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 19:04:41,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-21 19:04:41,144 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 28 states. [2020-08-21 19:04:41,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:41,317 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-08-21 19:04:41,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 19:04:41,317 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 60 [2020-08-21 19:04:41,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:41,318 INFO L225 Difference]: With dead ends: 70 [2020-08-21 19:04:41,318 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 19:04:41,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-21 19:04:41,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 19:04:41,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 19:04:41,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 19:04:41,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-08-21 19:04:41,323 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-08-21 19:04:41,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:41,324 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-08-21 19:04:41,324 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 19:04:41,324 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-08-21 19:04:41,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 19:04:41,325 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:41,325 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:41,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 19:04:41,325 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:41,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:41,327 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2020-08-21 19:04:41,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:41,327 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [11325773] [2020-08-21 19:04:41,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:41,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:41,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:41,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:41,816 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:41,816 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [11325773] [2020-08-21 19:04:41,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:41,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 19:04:41,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267776609] [2020-08-21 19:04:41,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 19:04:41,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:41,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 19:04:41,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-21 19:04:41,819 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 29 states. [2020-08-21 19:04:42,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:42,013 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-08-21 19:04:42,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 19:04:42,014 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2020-08-21 19:04:42,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:42,014 INFO L225 Difference]: With dead ends: 72 [2020-08-21 19:04:42,015 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 19:04:42,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-21 19:04:42,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 19:04:42,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 19:04:42,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 19:04:42,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-08-21 19:04:42,019 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-08-21 19:04:42,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:42,020 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-08-21 19:04:42,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 19:04:42,020 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-08-21 19:04:42,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 19:04:42,020 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:42,021 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:42,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 19:04:42,021 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:42,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:42,021 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2020-08-21 19:04:42,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:42,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [133284911] [2020-08-21 19:04:42,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:42,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:42,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:42,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:42,537 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:42,537 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [133284911] [2020-08-21 19:04:42,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:42,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 19:04:42,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782760688] [2020-08-21 19:04:42,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 19:04:42,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:42,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 19:04:42,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-21 19:04:42,538 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 30 states. [2020-08-21 19:04:42,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:42,710 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-08-21 19:04:42,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 19:04:42,711 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 64 [2020-08-21 19:04:42,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:42,712 INFO L225 Difference]: With dead ends: 74 [2020-08-21 19:04:42,712 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 19:04:42,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-21 19:04:42,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 19:04:42,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 19:04:42,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 19:04:42,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-08-21 19:04:42,720 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-08-21 19:04:42,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:42,720 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-08-21 19:04:42,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 19:04:42,720 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-08-21 19:04:42,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 19:04:42,721 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:42,721 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:42,721 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 19:04:42,722 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:42,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:42,722 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2020-08-21 19:04:42,722 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:42,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [594475710] [2020-08-21 19:04:42,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:42,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:43,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:43,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:43,244 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:43,245 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [594475710] [2020-08-21 19:04:43,245 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:43,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 19:04:43,246 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961932418] [2020-08-21 19:04:43,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 19:04:43,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:43,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 19:04:43,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-21 19:04:43,248 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 31 states. [2020-08-21 19:04:43,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:43,468 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-08-21 19:04:43,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 19:04:43,468 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 66 [2020-08-21 19:04:43,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:43,469 INFO L225 Difference]: With dead ends: 76 [2020-08-21 19:04:43,469 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 19:04:43,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-21 19:04:43,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 19:04:43,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 19:04:43,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 19:04:43,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-08-21 19:04:43,479 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-08-21 19:04:43,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:43,479 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-08-21 19:04:43,479 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 19:04:43,480 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-08-21 19:04:43,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 19:04:43,481 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:43,481 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:43,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 19:04:43,482 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:43,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:43,482 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2020-08-21 19:04:43,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:43,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1383160566] [2020-08-21 19:04:43,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:43,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:44,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:44,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:44,215 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:44,215 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1383160566] [2020-08-21 19:04:44,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:44,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 19:04:44,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184285543] [2020-08-21 19:04:44,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 19:04:44,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:44,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 19:04:44,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-21 19:04:44,218 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 32 states. [2020-08-21 19:04:44,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:44,444 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-08-21 19:04:44,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 19:04:44,445 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2020-08-21 19:04:44,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:44,446 INFO L225 Difference]: With dead ends: 78 [2020-08-21 19:04:44,446 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 19:04:44,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-21 19:04:44,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 19:04:44,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 19:04:44,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 19:04:44,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-08-21 19:04:44,454 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-08-21 19:04:44,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:44,455 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-08-21 19:04:44,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 19:04:44,455 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-08-21 19:04:44,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 19:04:44,456 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:44,456 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:44,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 19:04:44,456 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:44,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:44,457 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2020-08-21 19:04:44,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:44,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104726678] [2020-08-21 19:04:44,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:44,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:45,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:45,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:45,038 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:45,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104726678] [2020-08-21 19:04:45,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:45,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 19:04:45,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38779431] [2020-08-21 19:04:45,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 19:04:45,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:45,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 19:04:45,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 19:04:45,041 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 33 states. [2020-08-21 19:04:45,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:45,232 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-08-21 19:04:45,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 19:04:45,233 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 70 [2020-08-21 19:04:45,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:45,233 INFO L225 Difference]: With dead ends: 80 [2020-08-21 19:04:45,234 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 19:04:45,234 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 19:04:45,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 19:04:45,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 19:04:45,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 19:04:45,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-08-21 19:04:45,238 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-08-21 19:04:45,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:45,238 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-08-21 19:04:45,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 19:04:45,238 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-08-21 19:04:45,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 19:04:45,239 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:45,239 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:45,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 19:04:45,240 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:45,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:45,240 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2020-08-21 19:04:45,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:45,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772073145] [2020-08-21 19:04:45,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:45,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:45,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:45,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:45,969 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:45,969 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772073145] [2020-08-21 19:04:45,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:45,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 19:04:45,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146969258] [2020-08-21 19:04:45,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 19:04:45,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:45,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 19:04:45,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 19:04:45,973 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 34 states. [2020-08-21 19:04:46,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:46,194 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-08-21 19:04:46,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 19:04:46,195 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2020-08-21 19:04:46,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:46,196 INFO L225 Difference]: With dead ends: 82 [2020-08-21 19:04:46,196 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 19:04:46,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 19:04:46,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 19:04:46,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 19:04:46,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 19:04:46,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-08-21 19:04:46,202 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-08-21 19:04:46,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:46,202 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-08-21 19:04:46,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 19:04:46,203 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-08-21 19:04:46,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 19:04:46,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:46,204 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:46,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 19:04:46,204 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:46,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:46,204 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2020-08-21 19:04:46,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:46,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [567435660] [2020-08-21 19:04:46,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:46,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:46,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:46,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:46,893 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:46,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [567435660] [2020-08-21 19:04:46,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:46,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 19:04:46,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898689962] [2020-08-21 19:04:46,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 19:04:46,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:46,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 19:04:46,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 19:04:46,896 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 35 states. [2020-08-21 19:04:47,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:47,104 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-08-21 19:04:47,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 19:04:47,105 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-08-21 19:04:47,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:47,106 INFO L225 Difference]: With dead ends: 84 [2020-08-21 19:04:47,106 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 19:04:47,107 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 19:04:47,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 19:04:47,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 19:04:47,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 19:04:47,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-08-21 19:04:47,112 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-08-21 19:04:47,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:47,112 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-08-21 19:04:47,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 19:04:47,112 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-08-21 19:04:47,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 19:04:47,113 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:47,113 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:47,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 19:04:47,113 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:47,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:47,114 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2020-08-21 19:04:47,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:47,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1697429679] [2020-08-21 19:04:47,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:47,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:47,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:47,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:47,762 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:47,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1697429679] [2020-08-21 19:04:47,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:47,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 19:04:47,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653499740] [2020-08-21 19:04:47,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 19:04:47,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:47,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 19:04:47,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 19:04:47,765 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 36 states. [2020-08-21 19:04:47,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:47,940 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2020-08-21 19:04:47,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 19:04:47,940 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 76 [2020-08-21 19:04:47,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:47,941 INFO L225 Difference]: With dead ends: 86 [2020-08-21 19:04:47,941 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 19:04:47,942 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 19:04:47,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 19:04:47,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 19:04:47,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 19:04:47,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-08-21 19:04:47,949 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-08-21 19:04:47,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:47,949 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-08-21 19:04:47,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 19:04:47,950 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-08-21 19:04:47,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 19:04:47,951 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:47,951 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:47,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 19:04:47,952 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:47,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:47,952 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2020-08-21 19:04:47,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:47,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [750588442] [2020-08-21 19:04:47,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:47,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:48,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:48,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:48,686 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:48,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [750588442] [2020-08-21 19:04:48,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:48,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 19:04:48,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635355630] [2020-08-21 19:04:48,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 19:04:48,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:48,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 19:04:48,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 19:04:48,689 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 37 states. [2020-08-21 19:04:48,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:48,922 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2020-08-21 19:04:48,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 19:04:48,923 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 78 [2020-08-21 19:04:48,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:48,924 INFO L225 Difference]: With dead ends: 88 [2020-08-21 19:04:48,924 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 19:04:48,925 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 19:04:48,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 19:04:48,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 19:04:48,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 19:04:48,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2020-08-21 19:04:48,929 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2020-08-21 19:04:48,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:48,929 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2020-08-21 19:04:48,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 19:04:48,929 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2020-08-21 19:04:48,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 19:04:48,930 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:48,930 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:48,930 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 19:04:48,931 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:48,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:48,931 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2020-08-21 19:04:48,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:48,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [578304297] [2020-08-21 19:04:48,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:48,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:49,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:49,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:49,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:49,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [578304297] [2020-08-21 19:04:49,684 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:49,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 19:04:49,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620262322] [2020-08-21 19:04:49,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 19:04:49,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:49,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 19:04:49,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 19:04:49,686 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 38 states. [2020-08-21 19:04:49,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:49,876 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2020-08-21 19:04:49,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 19:04:49,877 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 80 [2020-08-21 19:04:49,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:49,878 INFO L225 Difference]: With dead ends: 90 [2020-08-21 19:04:49,878 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 19:04:49,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 19:04:49,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 19:04:49,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 19:04:49,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 19:04:49,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2020-08-21 19:04:49,883 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2020-08-21 19:04:49,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:49,884 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2020-08-21 19:04:49,884 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 19:04:49,884 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2020-08-21 19:04:49,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 19:04:49,885 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:49,885 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:49,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 19:04:49,885 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:49,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:49,886 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2020-08-21 19:04:49,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:49,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [538380017] [2020-08-21 19:04:49,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:49,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:50,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:50,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:50,673 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:50,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [538380017] [2020-08-21 19:04:50,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:50,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 19:04:50,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519865575] [2020-08-21 19:04:50,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 19:04:50,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:50,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 19:04:50,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 19:04:50,675 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 39 states. [2020-08-21 19:04:50,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:50,837 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2020-08-21 19:04:50,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 19:04:50,838 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2020-08-21 19:04:50,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:50,839 INFO L225 Difference]: With dead ends: 92 [2020-08-21 19:04:50,839 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 19:04:50,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 19:04:50,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 19:04:50,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 19:04:50,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 19:04:50,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2020-08-21 19:04:50,844 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2020-08-21 19:04:50,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:50,844 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2020-08-21 19:04:50,844 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 19:04:50,844 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2020-08-21 19:04:50,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 19:04:50,845 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:50,845 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:50,845 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 19:04:50,845 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:50,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:50,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1557780453, now seen corresponding path program 36 times [2020-08-21 19:04:50,846 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:50,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [139371635] [2020-08-21 19:04:50,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:50,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:51,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:51,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:51,711 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:51,712 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [139371635] [2020-08-21 19:04:51,712 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:51,712 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 19:04:51,712 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566559316] [2020-08-21 19:04:51,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 19:04:51,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:51,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 19:04:51,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 19:04:51,715 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 40 states. [2020-08-21 19:04:51,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:51,979 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2020-08-21 19:04:51,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 19:04:51,980 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 84 [2020-08-21 19:04:51,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:51,981 INFO L225 Difference]: With dead ends: 94 [2020-08-21 19:04:51,981 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 19:04:51,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 19:04:51,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 19:04:51,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 19:04:51,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 19:04:51,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2020-08-21 19:04:51,985 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2020-08-21 19:04:51,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:51,986 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2020-08-21 19:04:51,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 19:04:51,986 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2020-08-21 19:04:51,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 19:04:51,986 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:51,987 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:51,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 19:04:51,987 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:51,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:51,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1537674631, now seen corresponding path program 37 times [2020-08-21 19:04:51,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:51,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [566704943] [2020-08-21 19:04:51,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:52,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:52,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:52,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:52,854 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:52,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [566704943] [2020-08-21 19:04:52,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:52,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 19:04:52,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278476600] [2020-08-21 19:04:52,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 19:04:52,855 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:52,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 19:04:52,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 19:04:52,856 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 41 states. [2020-08-21 19:04:53,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:53,086 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2020-08-21 19:04:53,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 19:04:53,087 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-08-21 19:04:53,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:53,088 INFO L225 Difference]: With dead ends: 96 [2020-08-21 19:04:53,088 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 19:04:53,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 19:04:53,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 19:04:53,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 19:04:53,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 19:04:53,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2020-08-21 19:04:53,093 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2020-08-21 19:04:53,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:53,094 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2020-08-21 19:04:53,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 19:04:53,094 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2020-08-21 19:04:53,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 19:04:53,095 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:53,095 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:53,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 19:04:53,095 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:53,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:53,095 INFO L82 PathProgramCache]: Analyzing trace with hash -604151127, now seen corresponding path program 38 times [2020-08-21 19:04:53,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:53,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [29693274] [2020-08-21 19:04:53,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:53,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:54,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:54,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:54,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:54,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [29693274] [2020-08-21 19:04:54,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:54,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 19:04:54,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177873866] [2020-08-21 19:04:54,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 19:04:54,029 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:54,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 19:04:54,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 19:04:54,030 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 42 states. [2020-08-21 19:04:54,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:54,284 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2020-08-21 19:04:54,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 19:04:54,285 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 88 [2020-08-21 19:04:54,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:54,286 INFO L225 Difference]: With dead ends: 98 [2020-08-21 19:04:54,286 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 19:04:54,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 19:04:54,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 19:04:54,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 19:04:54,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 19:04:54,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2020-08-21 19:04:54,292 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2020-08-21 19:04:54,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:54,292 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2020-08-21 19:04:54,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 19:04:54,292 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2020-08-21 19:04:54,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 19:04:54,293 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:54,293 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:54,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 19:04:54,293 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:54,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:54,294 INFO L82 PathProgramCache]: Analyzing trace with hash -1609369781, now seen corresponding path program 39 times [2020-08-21 19:04:54,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:54,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1909264637] [2020-08-21 19:04:54,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:54,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:55,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:55,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:55,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:55,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1909264637] [2020-08-21 19:04:55,233 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:55,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 19:04:55,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368834774] [2020-08-21 19:04:55,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 19:04:55,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:55,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 19:04:55,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 19:04:55,235 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 43 states. [2020-08-21 19:04:55,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:55,507 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2020-08-21 19:04:55,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 19:04:55,507 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 90 [2020-08-21 19:04:55,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:55,508 INFO L225 Difference]: With dead ends: 100 [2020-08-21 19:04:55,509 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 19:04:55,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 19:04:55,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 19:04:55,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 19:04:55,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 19:04:55,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2020-08-21 19:04:55,514 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2020-08-21 19:04:55,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:55,514 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2020-08-21 19:04:55,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 19:04:55,514 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2020-08-21 19:04:55,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 19:04:55,515 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:55,515 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:55,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 19:04:55,516 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:55,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:55,516 INFO L82 PathProgramCache]: Analyzing trace with hash -1256854675, now seen corresponding path program 40 times [2020-08-21 19:04:55,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:55,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [519621522] [2020-08-21 19:04:55,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:55,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:56,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:56,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:56,552 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:56,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [519621522] [2020-08-21 19:04:56,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:56,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 19:04:56,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237925865] [2020-08-21 19:04:56,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 19:04:56,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:56,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 19:04:56,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 19:04:56,554 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 44 states. [2020-08-21 19:04:56,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:56,749 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2020-08-21 19:04:56,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 19:04:56,749 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 92 [2020-08-21 19:04:56,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:56,751 INFO L225 Difference]: With dead ends: 102 [2020-08-21 19:04:56,751 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 19:04:56,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 19:04:56,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 19:04:56,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 19:04:56,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 19:04:56,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2020-08-21 19:04:56,756 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2020-08-21 19:04:56,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:56,757 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2020-08-21 19:04:56,757 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 19:04:56,757 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2020-08-21 19:04:56,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 19:04:56,758 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:56,758 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:56,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 19:04:56,758 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:56,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:56,759 INFO L82 PathProgramCache]: Analyzing trace with hash -1792254193, now seen corresponding path program 41 times [2020-08-21 19:04:56,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:56,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1570896612] [2020-08-21 19:04:56,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:56,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:57,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:57,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:57,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:57,810 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1570896612] [2020-08-21 19:04:57,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:57,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 19:04:57,811 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596700385] [2020-08-21 19:04:57,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 19:04:57,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:57,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 19:04:57,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 19:04:57,813 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 45 states. [2020-08-21 19:04:58,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:58,107 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2020-08-21 19:04:58,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 19:04:58,108 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 94 [2020-08-21 19:04:58,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:58,109 INFO L225 Difference]: With dead ends: 104 [2020-08-21 19:04:58,110 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 19:04:58,111 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 19:04:58,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 19:04:58,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 19:04:58,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 19:04:58,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2020-08-21 19:04:58,115 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2020-08-21 19:04:58,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:58,116 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2020-08-21 19:04:58,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 19:04:58,116 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2020-08-21 19:04:58,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 19:04:58,117 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:58,117 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:58,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 19:04:58,117 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:58,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:58,118 INFO L82 PathProgramCache]: Analyzing trace with hash -915115471, now seen corresponding path program 42 times [2020-08-21 19:04:58,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:58,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [808974068] [2020-08-21 19:04:58,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:58,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:59,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:59,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:59,157 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:59,157 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [808974068] [2020-08-21 19:04:59,158 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:59,158 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 19:04:59,158 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938422892] [2020-08-21 19:04:59,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 19:04:59,158 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:59,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 19:04:59,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 19:04:59,161 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 46 states. [2020-08-21 19:04:59,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:59,328 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2020-08-21 19:04:59,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 19:04:59,329 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 96 [2020-08-21 19:04:59,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:59,330 INFO L225 Difference]: With dead ends: 106 [2020-08-21 19:04:59,331 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 19:04:59,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 19:04:59,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 19:04:59,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 19:04:59,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 19:04:59,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2020-08-21 19:04:59,335 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2020-08-21 19:04:59,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:59,336 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2020-08-21 19:04:59,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 19:04:59,336 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2020-08-21 19:04:59,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 19:04:59,336 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:59,337 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:59,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 19:04:59,337 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:59,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:59,337 INFO L82 PathProgramCache]: Analyzing trace with hash 201606355, now seen corresponding path program 43 times [2020-08-21 19:04:59,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:59,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527371174] [2020-08-21 19:04:59,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:59,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:00,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:00,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:00,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:00,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [527371174] [2020-08-21 19:05:00,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:00,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 19:05:00,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572970504] [2020-08-21 19:05:00,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 19:05:00,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:00,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 19:05:00,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 19:05:00,465 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 47 states. [2020-08-21 19:05:00,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:00,767 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2020-08-21 19:05:00,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 19:05:00,768 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 98 [2020-08-21 19:05:00,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:00,769 INFO L225 Difference]: With dead ends: 108 [2020-08-21 19:05:00,769 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 19:05:00,770 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 19:05:00,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 19:05:00,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 19:05:00,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 19:05:00,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2020-08-21 19:05:00,774 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2020-08-21 19:05:00,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:00,774 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2020-08-21 19:05:00,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 19:05:00,775 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2020-08-21 19:05:00,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 19:05:00,775 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:00,775 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:00,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 19:05:00,775 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:00,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:00,776 INFO L82 PathProgramCache]: Analyzing trace with hash -370542859, now seen corresponding path program 44 times [2020-08-21 19:05:00,776 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:00,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053822725] [2020-08-21 19:05:00,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:00,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:01,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:01,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:02,004 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:02,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053822725] [2020-08-21 19:05:02,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:02,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 19:05:02,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281578131] [2020-08-21 19:05:02,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 19:05:02,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:02,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 19:05:02,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 19:05:02,006 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 48 states. [2020-08-21 19:05:02,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:02,239 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2020-08-21 19:05:02,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 19:05:02,239 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 100 [2020-08-21 19:05:02,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:02,241 INFO L225 Difference]: With dead ends: 110 [2020-08-21 19:05:02,241 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 19:05:02,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 19:05:02,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 19:05:02,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 19:05:02,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 19:05:02,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-08-21 19:05:02,246 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2020-08-21 19:05:02,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:02,246 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-08-21 19:05:02,246 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 19:05:02,247 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-08-21 19:05:02,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 19:05:02,247 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:02,247 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:02,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 19:05:02,248 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:02,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:02,248 INFO L82 PathProgramCache]: Analyzing trace with hash -450123625, now seen corresponding path program 45 times [2020-08-21 19:05:02,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:02,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [9037794] [2020-08-21 19:05:02,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:02,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:03,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:03,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:03,562 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:03,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [9037794] [2020-08-21 19:05:03,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:03,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 19:05:03,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278403475] [2020-08-21 19:05:03,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 19:05:03,563 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:03,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 19:05:03,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 19:05:03,564 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 49 states. [2020-08-21 19:05:03,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:03,775 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2020-08-21 19:05:03,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 19:05:03,775 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 102 [2020-08-21 19:05:03,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:03,776 INFO L225 Difference]: With dead ends: 112 [2020-08-21 19:05:03,777 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 19:05:03,777 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 19:05:03,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 19:05:03,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 19:05:03,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 19:05:03,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-08-21 19:05:03,781 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2020-08-21 19:05:03,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:03,782 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-08-21 19:05:03,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 19:05:03,782 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-08-21 19:05:03,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-21 19:05:03,783 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:03,783 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:03,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 19:05:03,783 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:03,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:03,783 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 46 times [2020-08-21 19:05:03,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:03,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [987663176] [2020-08-21 19:05:03,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:03,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:05,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:05,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:05,107 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:05,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [987663176] [2020-08-21 19:05:05,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:05,108 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 19:05:05,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307773594] [2020-08-21 19:05:05,108 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 19:05:05,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:05,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 19:05:05,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 19:05:05,109 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 50 states. [2020-08-21 19:05:05,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:05,321 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2020-08-21 19:05:05,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-21 19:05:05,321 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2020-08-21 19:05:05,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:05,323 INFO L225 Difference]: With dead ends: 114 [2020-08-21 19:05:05,323 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 19:05:05,324 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 19:05:05,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 19:05:05,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 19:05:05,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 19:05:05,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-08-21 19:05:05,328 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2020-08-21 19:05:05,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:05,328 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-08-21 19:05:05,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-21 19:05:05,328 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-08-21 19:05:05,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-21 19:05:05,329 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:05,329 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:05,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-21 19:05:05,330 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:05,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:05,330 INFO L82 PathProgramCache]: Analyzing trace with hash 1353943643, now seen corresponding path program 47 times [2020-08-21 19:05:05,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:05,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [979537565] [2020-08-21 19:05:05,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:05,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:06,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:06,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:06,747 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:06,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [979537565] [2020-08-21 19:05:06,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:06,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-21 19:05:06,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167617909] [2020-08-21 19:05:06,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-21 19:05:06,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:06,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-21 19:05:06,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 19:05:06,748 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 51 states. [2020-08-21 19:05:06,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:06,968 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2020-08-21 19:05:06,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-21 19:05:06,968 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 106 [2020-08-21 19:05:06,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:06,969 INFO L225 Difference]: With dead ends: 116 [2020-08-21 19:05:06,970 INFO L226 Difference]: Without dead ends: 110 [2020-08-21 19:05:06,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 19:05:06,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-21 19:05:06,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-21 19:05:06,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-21 19:05:06,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2020-08-21 19:05:06,977 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2020-08-21 19:05:06,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:06,978 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2020-08-21 19:05:06,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-21 19:05:06,978 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2020-08-21 19:05:06,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-21 19:05:06,979 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:06,979 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:06,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-21 19:05:06,979 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:06,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:06,979 INFO L82 PathProgramCache]: Analyzing trace with hash -1075971459, now seen corresponding path program 48 times [2020-08-21 19:05:06,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:06,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1812096537] [2020-08-21 19:05:06,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:07,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:08,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:08,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:08,423 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:08,423 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1812096537] [2020-08-21 19:05:08,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:08,424 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-08-21 19:05:08,424 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378986762] [2020-08-21 19:05:08,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-08-21 19:05:08,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:08,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-08-21 19:05:08,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-21 19:05:08,425 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 52 states. [2020-08-21 19:05:08,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:08,635 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2020-08-21 19:05:08,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-08-21 19:05:08,636 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 108 [2020-08-21 19:05:08,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:08,637 INFO L225 Difference]: With dead ends: 118 [2020-08-21 19:05:08,637 INFO L226 Difference]: Without dead ends: 112 [2020-08-21 19:05:08,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-21 19:05:08,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-21 19:05:08,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-21 19:05:08,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-21 19:05:08,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2020-08-21 19:05:08,648 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2020-08-21 19:05:08,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:08,649 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2020-08-21 19:05:08,649 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-08-21 19:05:08,649 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2020-08-21 19:05:08,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-21 19:05:08,649 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:08,650 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:08,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-21 19:05:08,650 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:08,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:08,650 INFO L82 PathProgramCache]: Analyzing trace with hash 237824543, now seen corresponding path program 49 times [2020-08-21 19:05:08,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:08,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1302864919] [2020-08-21 19:05:08,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:08,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:10,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:10,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:10,229 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:10,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1302864919] [2020-08-21 19:05:10,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:10,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-21 19:05:10,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621124353] [2020-08-21 19:05:10,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-21 19:05:10,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:10,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-21 19:05:10,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-21 19:05:10,231 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 53 states. [2020-08-21 19:05:10,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:10,504 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2020-08-21 19:05:10,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-08-21 19:05:10,504 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 110 [2020-08-21 19:05:10,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:10,506 INFO L225 Difference]: With dead ends: 120 [2020-08-21 19:05:10,506 INFO L226 Difference]: Without dead ends: 114 [2020-08-21 19:05:10,507 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-21 19:05:10,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-21 19:05:10,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-08-21 19:05:10,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-21 19:05:10,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2020-08-21 19:05:10,511 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2020-08-21 19:05:10,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:10,512 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2020-08-21 19:05:10,512 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-21 19:05:10,513 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2020-08-21 19:05:10,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-21 19:05:10,514 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:10,514 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:10,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-21 19:05:10,514 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:10,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:10,515 INFO L82 PathProgramCache]: Analyzing trace with hash 75397441, now seen corresponding path program 50 times [2020-08-21 19:05:10,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:10,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [838570] [2020-08-21 19:05:10,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:10,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:12,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:12,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:12,091 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:12,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [838570] [2020-08-21 19:05:12,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:12,092 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-08-21 19:05:12,092 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427630150] [2020-08-21 19:05:12,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-08-21 19:05:12,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:12,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-08-21 19:05:12,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-21 19:05:12,093 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 54 states. [2020-08-21 19:05:12,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:12,425 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2020-08-21 19:05:12,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-08-21 19:05:12,426 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 112 [2020-08-21 19:05:12,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:12,427 INFO L225 Difference]: With dead ends: 122 [2020-08-21 19:05:12,427 INFO L226 Difference]: Without dead ends: 116 [2020-08-21 19:05:12,428 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-21 19:05:12,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-08-21 19:05:12,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-08-21 19:05:12,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-21 19:05:12,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2020-08-21 19:05:12,433 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2020-08-21 19:05:12,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:12,433 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2020-08-21 19:05:12,433 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-08-21 19:05:12,433 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2020-08-21 19:05:12,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-21 19:05:12,434 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:12,434 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:12,434 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-21 19:05:12,435 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:12,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:12,435 INFO L82 PathProgramCache]: Analyzing trace with hash -1398224925, now seen corresponding path program 51 times [2020-08-21 19:05:12,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:12,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1953100492] [2020-08-21 19:05:12,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:12,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:14,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:14,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:14,145 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:14,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1953100492] [2020-08-21 19:05:14,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:14,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-21 19:05:14,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032486103] [2020-08-21 19:05:14,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-21 19:05:14,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:14,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-21 19:05:14,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-21 19:05:14,147 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 55 states. [2020-08-21 19:05:14,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:14,497 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2020-08-21 19:05:14,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-08-21 19:05:14,497 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 114 [2020-08-21 19:05:14,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:14,499 INFO L225 Difference]: With dead ends: 124 [2020-08-21 19:05:14,499 INFO L226 Difference]: Without dead ends: 118 [2020-08-21 19:05:14,500 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-21 19:05:14,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-21 19:05:14,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2020-08-21 19:05:14,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-08-21 19:05:14,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2020-08-21 19:05:14,504 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2020-08-21 19:05:14,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:14,505 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2020-08-21 19:05:14,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-21 19:05:14,505 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2020-08-21 19:05:14,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-21 19:05:14,506 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:14,506 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:14,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-21 19:05:14,506 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:14,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:14,507 INFO L82 PathProgramCache]: Analyzing trace with hash -210110971, now seen corresponding path program 52 times [2020-08-21 19:05:14,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:14,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1711423028] [2020-08-21 19:05:14,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:14,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:16,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:16,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:16,244 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:16,244 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1711423028] [2020-08-21 19:05:16,244 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:16,244 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-08-21 19:05:16,245 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975035877] [2020-08-21 19:05:16,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-08-21 19:05:16,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:16,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-08-21 19:05:16,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-21 19:05:16,246 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 56 states. [2020-08-21 19:05:16,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:16,615 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2020-08-21 19:05:16,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-08-21 19:05:16,616 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2020-08-21 19:05:16,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:16,617 INFO L225 Difference]: With dead ends: 126 [2020-08-21 19:05:16,618 INFO L226 Difference]: Without dead ends: 120 [2020-08-21 19:05:16,618 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-21 19:05:16,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-08-21 19:05:16,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2020-08-21 19:05:16,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-21 19:05:16,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2020-08-21 19:05:16,622 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2020-08-21 19:05:16,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:16,622 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2020-08-21 19:05:16,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-08-21 19:05:16,622 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2020-08-21 19:05:16,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-21 19:05:16,623 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:16,623 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:16,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-21 19:05:16,624 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:16,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:16,624 INFO L82 PathProgramCache]: Analyzing trace with hash -893901913, now seen corresponding path program 53 times [2020-08-21 19:05:16,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:16,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1936968419] [2020-08-21 19:05:16,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:16,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:18,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:18,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:18,465 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:18,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1936968419] [2020-08-21 19:05:18,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:18,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-21 19:05:18,466 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931249874] [2020-08-21 19:05:18,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-21 19:05:18,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:18,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-21 19:05:18,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-21 19:05:18,467 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 57 states. [2020-08-21 19:05:18,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:18,752 INFO L93 Difference]: Finished difference Result 128 states and 128 transitions. [2020-08-21 19:05:18,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-08-21 19:05:18,753 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 118 [2020-08-21 19:05:18,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:18,754 INFO L225 Difference]: With dead ends: 128 [2020-08-21 19:05:18,754 INFO L226 Difference]: Without dead ends: 122 [2020-08-21 19:05:18,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-21 19:05:18,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-21 19:05:18,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2020-08-21 19:05:18,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-21 19:05:18,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2020-08-21 19:05:18,760 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 118 [2020-08-21 19:05:18,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:18,760 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2020-08-21 19:05:18,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-21 19:05:18,761 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2020-08-21 19:05:18,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-21 19:05:18,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:18,762 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:18,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-21 19:05:18,762 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:18,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:18,762 INFO L82 PathProgramCache]: Analyzing trace with hash -887000887, now seen corresponding path program 54 times [2020-08-21 19:05:18,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:18,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1112886417] [2020-08-21 19:05:18,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:18,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:20,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:20,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:20,505 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:20,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1112886417] [2020-08-21 19:05:20,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:20,506 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-08-21 19:05:20,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218333069] [2020-08-21 19:05:20,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-08-21 19:05:20,506 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:20,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-08-21 19:05:20,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-21 19:05:20,507 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 58 states. [2020-08-21 19:05:20,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:20,841 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2020-08-21 19:05:20,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-08-21 19:05:20,842 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 120 [2020-08-21 19:05:20,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:20,843 INFO L225 Difference]: With dead ends: 130 [2020-08-21 19:05:20,844 INFO L226 Difference]: Without dead ends: 124 [2020-08-21 19:05:20,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-21 19:05:20,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-21 19:05:20,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2020-08-21 19:05:20,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-08-21 19:05:20,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-08-21 19:05:20,849 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 120 [2020-08-21 19:05:20,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:20,850 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-08-21 19:05:20,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-08-21 19:05:20,850 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-08-21 19:05:20,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-21 19:05:20,850 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:20,851 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:20,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-21 19:05:20,851 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:20,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:20,851 INFO L82 PathProgramCache]: Analyzing trace with hash 1449917803, now seen corresponding path program 55 times [2020-08-21 19:05:20,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:20,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1281207783] [2020-08-21 19:05:20,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:20,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:22,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:22,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:22,696 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:22,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1281207783] [2020-08-21 19:05:22,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:22,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-08-21 19:05:22,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192648278] [2020-08-21 19:05:22,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-08-21 19:05:22,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:22,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-08-21 19:05:22,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-21 19:05:22,698 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 59 states. [2020-08-21 19:05:22,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:22,947 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2020-08-21 19:05:22,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-08-21 19:05:22,948 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 122 [2020-08-21 19:05:22,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:22,949 INFO L225 Difference]: With dead ends: 132 [2020-08-21 19:05:22,949 INFO L226 Difference]: Without dead ends: 126 [2020-08-21 19:05:22,950 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-21 19:05:22,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-21 19:05:22,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-08-21 19:05:22,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-21 19:05:22,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2020-08-21 19:05:22,954 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 122 [2020-08-21 19:05:22,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:22,954 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2020-08-21 19:05:22,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-08-21 19:05:22,955 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2020-08-21 19:05:22,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-21 19:05:22,955 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:22,955 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:22,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-21 19:05:22,958 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:22,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:22,958 INFO L82 PathProgramCache]: Analyzing trace with hash 960883085, now seen corresponding path program 56 times [2020-08-21 19:05:22,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:22,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1439823382] [2020-08-21 19:05:22,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:22,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:24,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:24,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:24,920 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:24,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1439823382] [2020-08-21 19:05:24,921 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:24,921 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-08-21 19:05:24,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424405276] [2020-08-21 19:05:24,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-08-21 19:05:24,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:24,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-08-21 19:05:24,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-21 19:05:24,922 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 60 states. [2020-08-21 19:05:25,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:25,310 INFO L93 Difference]: Finished difference Result 134 states and 134 transitions. [2020-08-21 19:05:25,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-08-21 19:05:25,310 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 124 [2020-08-21 19:05:25,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:25,312 INFO L225 Difference]: With dead ends: 134 [2020-08-21 19:05:25,312 INFO L226 Difference]: Without dead ends: 128 [2020-08-21 19:05:25,312 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-21 19:05:25,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-08-21 19:05:25,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2020-08-21 19:05:25,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-21 19:05:25,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2020-08-21 19:05:25,316 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 124 [2020-08-21 19:05:25,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:25,316 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2020-08-21 19:05:25,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-08-21 19:05:25,316 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2020-08-21 19:05:25,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-21 19:05:25,317 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:25,317 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:25,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-21 19:05:25,317 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:25,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:25,318 INFO L82 PathProgramCache]: Analyzing trace with hash -850045649, now seen corresponding path program 57 times [2020-08-21 19:05:25,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:25,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [457321846] [2020-08-21 19:05:25,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:25,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat