/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 04:30:23,136 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 04:30:23,140 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 04:30:23,184 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 04:30:23,184 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 04:30:23,197 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 04:30:23,200 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 04:30:23,201 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 04:30:23,204 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 04:30:23,205 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 04:30:23,206 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 04:30:23,210 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 04:30:23,210 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 04:30:23,213 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 04:30:23,214 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 04:30:23,218 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 04:30:23,219 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 04:30:23,222 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 04:30:23,224 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 04:30:23,229 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 04:30:23,232 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 04:30:23,233 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 04:30:23,235 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 04:30:23,236 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 04:30:23,241 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-19 04:30:23,241 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-19 04:30:23,242 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-19 04:30:23,245 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-19 04:30:23,245 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-19 04:30:23,247 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-19 04:30:23,247 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-19 04:30:23,248 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-19 04:30:23,249 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-19 04:30:23,249 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-19 04:30:23,251 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-19 04:30:23,251 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-19 04:30:23,251 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-19 04:30:23,252 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-19 04:30:23,252 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 04:30:23,253 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 04:30:23,254 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 04:30:23,255 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 [2020-08-19 04:30:23,302 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 04:30:23,302 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 04:30:23,304 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 04:30:23,305 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 04:30:23,305 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 04:30:23,305 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 04:30:23,306 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 04:30:23,306 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 04:30:23,306 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 04:30:23,306 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 04:30:23,307 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 04:30:23,308 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 04:30:23,308 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 04:30:23,308 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 04:30:23,309 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 04:30:23,309 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 04:30:23,309 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 04:30:23,309 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 04:30:23,309 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 04:30:23,310 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 04:30:23,310 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 04:30:23,310 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 04:30:23,310 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 04:30:23,311 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 04:30:23,311 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 04:30:23,311 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 04:30:23,311 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 04:30:23,311 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 04:30:23,312 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 04:30:23,312 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2; [2020-08-19 04:30:23,592 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 04:30:23,604 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 04:30:23,608 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 04:30:23,609 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 04:30:23,610 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 04:30:23,610 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-19 04:30:23,691 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1b9fe58d1/5eca4eab88fa4651abf5c7fa981bde3c/FLAG9359eb850 [2020-08-19 04:30:24,230 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 04:30:24,231 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-19 04:30:24,237 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1b9fe58d1/5eca4eab88fa4651abf5c7fa981bde3c/FLAG9359eb850 [2020-08-19 04:30:24,636 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1b9fe58d1/5eca4eab88fa4651abf5c7fa981bde3c [2020-08-19 04:30:24,646 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 04:30:24,648 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 04:30:24,649 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 04:30:24,649 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 04:30:24,653 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 04:30:24,654 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 04:30:24" (1/1) ... [2020-08-19 04:30:24,656 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@302e0b1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:24, skipping insertion in model container [2020-08-19 04:30:24,657 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 04:30:24" (1/1) ... [2020-08-19 04:30:24,664 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 04:30:24,677 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 04:30:24,850 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 04:30:24,944 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 04:30:24,964 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 04:30:25,097 INFO L208 MainTranslator]: Completed translation [2020-08-19 04:30:25,097 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:25 WrapperNode [2020-08-19 04:30:25,098 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 04:30:25,098 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 04:30:25,099 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 04:30:25,099 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 04:30:25,110 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:25" (1/1) ... [2020-08-19 04:30:25,110 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:25" (1/1) ... [2020-08-19 04:30:25,118 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:25" (1/1) ... [2020-08-19 04:30:25,118 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:25" (1/1) ... [2020-08-19 04:30:25,126 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:25" (1/1) ... [2020-08-19 04:30:25,131 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:25" (1/1) ... [2020-08-19 04:30:25,132 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:25" (1/1) ... [2020-08-19 04:30:25,135 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 04:30:25,135 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 04:30:25,135 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 04:30:25,136 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 04:30:25,136 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:25" (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 [2020-08-19 04:30:25,202 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 04:30:25,203 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 04:30:25,203 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 04:30:25,203 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 04:30:25,203 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 04:30:25,203 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-19 04:30:25,203 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-19 04:30:25,204 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 04:30:25,204 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 04:30:25,204 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-19 04:30:25,204 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 04:30:25,204 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 04:30:25,483 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 04:30:25,483 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 04:30:25,487 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 04:30:25 BoogieIcfgContainer [2020-08-19 04:30:25,488 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 04:30:25,489 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 04:30:25,489 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 04:30:25,492 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 04:30:25,493 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 04:30:24" (1/3) ... [2020-08-19 04:30:25,493 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6edcc434 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 04:30:25, skipping insertion in model container [2020-08-19 04:30:25,494 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:25" (2/3) ... [2020-08-19 04:30:25,494 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6edcc434 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 04:30:25, skipping insertion in model container [2020-08-19 04:30:25,494 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 04:30:25" (3/3) ... [2020-08-19 04:30:25,496 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-19 04:30:25,509 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 04:30:25,517 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 04:30:25,533 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 04:30:25,558 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 04:30:25,559 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 04:30:25,559 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 04:30:25,559 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 04:30:25,560 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 04:30:25,560 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 04:30:25,560 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 04:30:25,560 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 04:30:25,586 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-19 04:30:25,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-19 04:30:25,593 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:25,594 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:25,594 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:25,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:25,601 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-19 04:30:25,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:25,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1075079026] [2020-08-19 04:30:25,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:25,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:25,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:25,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:25,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:25,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1075079026] [2020-08-19 04:30:25,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:30:25,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 04:30:25,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555051151] [2020-08-19 04:30:25,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 04:30:25,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:25,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 04:30:25,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 04:30:25,883 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-19 04:30:25,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:25,988 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-19 04:30:25,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 04:30:25,990 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-19 04:30:25,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:26,000 INFO L225 Difference]: With dead ends: 42 [2020-08-19 04:30:26,000 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 04:30:26,004 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 [2020-08-19 04:30:26,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 04:30:26,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-19 04:30:26,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 04:30:26,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-19 04:30:26,047 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-19 04:30:26,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:26,048 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-19 04:30:26,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 04:30:26,048 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-19 04:30:26,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-19 04:30:26,049 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:26,049 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:26,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 04:30:26,050 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:26,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:26,050 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-19 04:30:26,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:26,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [757257861] [2020-08-19 04:30:26,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:26,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:26,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:26,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:26,137 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:26,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [757257861] [2020-08-19 04:30:26,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:30:26,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 04:30:26,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591258823] [2020-08-19 04:30:26,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 04:30:26,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:26,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 04:30:26,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 04:30:26,141 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-19 04:30:26,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:26,250 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-19 04:30:26,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 04:30:26,250 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-19 04:30:26,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:26,252 INFO L225 Difference]: With dead ends: 36 [2020-08-19 04:30:26,252 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 04:30:26,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 04:30:26,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 04:30:26,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-19 04:30:26,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 04:30:26,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-19 04:30:26,261 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-19 04:30:26,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:26,261 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-19 04:30:26,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 04:30:26,262 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-19 04:30:26,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 04:30:26,262 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:26,262 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:26,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 04:30:26,263 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:26,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:26,263 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-19 04:30:26,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:26,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775637412] [2020-08-19 04:30:26,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:26,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:26,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:26,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:26,374 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:26,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775637412] [2020-08-19 04:30:26,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:30:26,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 04:30:26,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413663022] [2020-08-19 04:30:26,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 04:30:26,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:26,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 04:30:26,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 04:30:26,377 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-19 04:30:26,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:26,482 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-19 04:30:26,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 04:30:26,483 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-19 04:30:26,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:26,484 INFO L225 Difference]: With dead ends: 40 [2020-08-19 04:30:26,484 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 04:30:26,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 04:30:26,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 04:30:26,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-19 04:30:26,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 04:30:26,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-19 04:30:26,492 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-19 04:30:26,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:26,492 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-19 04:30:26,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 04:30:26,493 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-19 04:30:26,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 04:30:26,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:26,494 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:26,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 04:30:26,494 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:26,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:26,495 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-19 04:30:26,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:26,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [269515159] [2020-08-19 04:30:26,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:26,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:26,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:26,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:26,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:26,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [269515159] [2020-08-19 04:30:26,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:30:26,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 04:30:26,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633576858] [2020-08-19 04:30:26,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 04:30:26,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:26,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 04:30:26,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 04:30:26,599 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-19 04:30:26,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:26,697 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-19 04:30:26,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 04:30:26,698 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-19 04:30:26,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:26,699 INFO L225 Difference]: With dead ends: 31 [2020-08-19 04:30:26,699 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 04:30:26,701 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 04:30:26,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 04:30:26,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-19 04:30:26,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 04:30:26,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-19 04:30:26,712 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-19 04:30:26,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:26,713 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-19 04:30:26,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 04:30:26,713 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-19 04:30:26,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 04:30:26,715 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:26,715 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:26,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 04:30:26,716 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:26,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:26,716 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-19 04:30:26,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:26,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [922757555] [2020-08-19 04:30:26,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:26,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:26,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:26,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:26,905 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:26,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [922757555] [2020-08-19 04:30:26,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:26,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 04:30:26,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074249320] [2020-08-19 04:30:26,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 04:30:26,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:26,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 04:30:26,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 04:30:26,909 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-19 04:30:27,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:27,006 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-19 04:30:27,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 04:30:27,007 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-19 04:30:27,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:27,008 INFO L225 Difference]: With dead ends: 34 [2020-08-19 04:30:27,008 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 04:30:27,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-19 04:30:27,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 04:30:27,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-19 04:30:27,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 04:30:27,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-19 04:30:27,015 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-19 04:30:27,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:27,016 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-19 04:30:27,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 04:30:27,016 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-19 04:30:27,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 04:30:27,017 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:27,017 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:27,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 04:30:27,018 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:27,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:27,018 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-19 04:30:27,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:27,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [269495203] [2020-08-19 04:30:27,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:27,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:27,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:27,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:27,147 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:27,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [269495203] [2020-08-19 04:30:27,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:27,148 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 04:30:27,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467176850] [2020-08-19 04:30:27,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 04:30:27,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:27,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 04:30:27,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 04:30:27,149 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-19 04:30:27,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:27,235 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-19 04:30:27,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 04:30:27,236 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-19 04:30:27,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:27,237 INFO L225 Difference]: With dead ends: 38 [2020-08-19 04:30:27,237 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 04:30:27,238 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-19 04:30:27,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 04:30:27,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-19 04:30:27,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-19 04:30:27,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-19 04:30:27,243 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-19 04:30:27,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:27,243 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-19 04:30:27,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 04:30:27,244 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-19 04:30:27,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-19 04:30:27,244 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:27,245 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:27,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 04:30:27,245 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:27,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:27,245 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-19 04:30:27,246 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:27,246 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [553764185] [2020-08-19 04:30:27,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:27,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:27,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:27,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:27,403 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:27,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [553764185] [2020-08-19 04:30:27,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:27,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 04:30:27,404 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281304152] [2020-08-19 04:30:27,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 04:30:27,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:27,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 04:30:27,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-19 04:30:27,406 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-19 04:30:27,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:27,500 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-19 04:30:27,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 04:30:27,501 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-19 04:30:27,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:27,502 INFO L225 Difference]: With dead ends: 42 [2020-08-19 04:30:27,502 INFO L226 Difference]: Without dead ends: 27 [2020-08-19 04:30:27,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-19 04:30:27,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-19 04:30:27,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-19 04:30:27,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 04:30:27,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-19 04:30:27,508 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-19 04:30:27,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:27,509 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-19 04:30:27,509 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 04:30:27,509 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-19 04:30:27,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-19 04:30:27,510 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:27,510 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:27,510 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 04:30:27,510 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:27,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:27,511 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-19 04:30:27,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:27,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1221096141] [2020-08-19 04:30:27,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:27,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:27,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:27,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:27,626 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:27,626 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1221096141] [2020-08-19 04:30:27,626 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:27,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 04:30:27,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90924327] [2020-08-19 04:30:27,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 04:30:27,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:27,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 04:30:27,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-19 04:30:27,628 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-19 04:30:27,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:27,733 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-19 04:30:27,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 04:30:27,733 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-19 04:30:27,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:27,734 INFO L225 Difference]: With dead ends: 46 [2020-08-19 04:30:27,734 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 04:30:27,735 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-19 04:30:27,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 04:30:27,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-19 04:30:27,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 04:30:27,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-19 04:30:27,740 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-19 04:30:27,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:27,740 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-19 04:30:27,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 04:30:27,741 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-19 04:30:27,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 04:30:27,742 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:27,742 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:27,742 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 04:30:27,742 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:27,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:27,743 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-19 04:30:27,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:27,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1669159360] [2020-08-19 04:30:27,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:27,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:27,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:27,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:27,874 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:27,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1669159360] [2020-08-19 04:30:27,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:27,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 04:30:27,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298220077] [2020-08-19 04:30:27,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 04:30:27,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:27,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 04:30:27,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-19 04:30:27,876 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-19 04:30:28,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:28,029 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-19 04:30:28,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 04:30:28,029 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-19 04:30:28,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:28,030 INFO L225 Difference]: With dead ends: 50 [2020-08-19 04:30:28,030 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 04:30:28,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-19 04:30:28,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 04:30:28,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-19 04:30:28,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 04:30:28,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-19 04:30:28,037 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-19 04:30:28,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:28,037 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-19 04:30:28,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 04:30:28,037 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-19 04:30:28,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 04:30:28,038 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:28,038 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:28,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 04:30:28,039 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:28,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:28,039 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-19 04:30:28,039 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:28,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1243781449] [2020-08-19 04:30:28,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:28,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:28,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:28,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:28,197 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:28,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1243781449] [2020-08-19 04:30:28,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:28,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 04:30:28,198 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888625057] [2020-08-19 04:30:28,198 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 04:30:28,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:28,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 04:30:28,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-19 04:30:28,200 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-19 04:30:28,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:28,418 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-19 04:30:28,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 04:30:28,419 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-19 04:30:28,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:28,420 INFO L225 Difference]: With dead ends: 54 [2020-08-19 04:30:28,420 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 04:30:28,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-19 04:30:28,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 04:30:28,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-19 04:30:28,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-19 04:30:28,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-19 04:30:28,427 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-19 04:30:28,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:28,429 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-19 04:30:28,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 04:30:28,429 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-19 04:30:28,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-19 04:30:28,432 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:28,432 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:28,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 04:30:28,432 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:28,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:28,433 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-19 04:30:28,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:28,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1058348219] [2020-08-19 04:30:28,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:28,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:28,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:28,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:28,671 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:28,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1058348219] [2020-08-19 04:30:28,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:28,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 04:30:28,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270094431] [2020-08-19 04:30:28,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 04:30:28,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:28,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 04:30:28,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-19 04:30:28,675 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-19 04:30:28,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:28,875 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-19 04:30:28,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 04:30:28,877 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-19 04:30:28,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:28,878 INFO L225 Difference]: With dead ends: 58 [2020-08-19 04:30:28,878 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 04:30:28,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-08-19 04:30:28,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 04:30:28,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-19 04:30:28,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 04:30:28,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-19 04:30:28,890 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-19 04:30:28,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:28,890 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-19 04:30:28,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 04:30:28,892 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-19 04:30:28,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 04:30:28,894 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:28,894 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:28,894 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 04:30:28,895 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:28,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:28,895 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-19 04:30:28,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:28,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1527294267] [2020-08-19 04:30:28,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:28,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:29,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:29,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:29,123 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:29,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1527294267] [2020-08-19 04:30:29,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:29,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 04:30:29,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121058848] [2020-08-19 04:30:29,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 04:30:29,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:29,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 04:30:29,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-19 04:30:29,126 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-19 04:30:29,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:29,351 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-19 04:30:29,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 04:30:29,352 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-19 04:30:29,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:29,352 INFO L225 Difference]: With dead ends: 62 [2020-08-19 04:30:29,353 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 04:30:29,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-19 04:30:29,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 04:30:29,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-19 04:30:29,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 04:30:29,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-19 04:30:29,359 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-19 04:30:29,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:29,359 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-19 04:30:29,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 04:30:29,360 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-19 04:30:29,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 04:30:29,360 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:29,360 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:29,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 04:30:29,361 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:29,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:29,361 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-19 04:30:29,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:29,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1535910091] [2020-08-19 04:30:29,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:29,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:29,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:29,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:29,584 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:29,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1535910091] [2020-08-19 04:30:29,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:29,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 04:30:29,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835909448] [2020-08-19 04:30:29,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 04:30:29,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:29,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 04:30:29,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-19 04:30:29,587 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-19 04:30:29,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:29,889 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-19 04:30:29,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 04:30:29,889 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-19 04:30:29,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:29,890 INFO L225 Difference]: With dead ends: 66 [2020-08-19 04:30:29,890 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 04:30:29,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-19 04:30:29,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 04:30:29,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-19 04:30:29,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 04:30:29,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-19 04:30:29,897 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-19 04:30:29,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:29,898 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-19 04:30:29,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 04:30:29,898 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-19 04:30:29,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 04:30:29,898 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:29,899 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:29,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 04:30:29,899 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:29,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:29,899 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-19 04:30:29,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:29,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1989260155] [2020-08-19 04:30:29,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:29,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:30,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:30,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:30,115 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:30,116 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1989260155] [2020-08-19 04:30:30,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:30,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 04:30:30,117 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153982285] [2020-08-19 04:30:30,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 04:30:30,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:30,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 04:30:30,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-19 04:30:30,119 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-19 04:30:30,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:30,447 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-19 04:30:30,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 04:30:30,448 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-19 04:30:30,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:30,449 INFO L225 Difference]: With dead ends: 70 [2020-08-19 04:30:30,449 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 04:30:30,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-19 04:30:30,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 04:30:30,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-19 04:30:30,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 04:30:30,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-19 04:30:30,457 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-19 04:30:30,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:30,457 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-19 04:30:30,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 04:30:30,457 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-19 04:30:30,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 04:30:30,458 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:30,458 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:30,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 04:30:30,459 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:30,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:30,459 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-19 04:30:30,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:30,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1174797119] [2020-08-19 04:30:30,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:30,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:30,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:30,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:30,740 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:30,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1174797119] [2020-08-19 04:30:30,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:30,741 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 04:30:30,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076486445] [2020-08-19 04:30:30,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 04:30:30,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:30,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 04:30:30,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-19 04:30:30,743 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-19 04:30:31,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:31,122 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-19 04:30:31,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 04:30:31,123 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-19 04:30:31,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:31,124 INFO L225 Difference]: With dead ends: 74 [2020-08-19 04:30:31,124 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 04:30:31,125 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-19 04:30:31,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 04:30:31,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-19 04:30:31,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 04:30:31,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-19 04:30:31,131 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-19 04:30:31,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:31,132 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-19 04:30:31,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 04:30:31,132 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-19 04:30:31,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 04:30:31,133 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:31,133 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:31,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 04:30:31,134 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:31,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:31,134 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-19 04:30:31,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:31,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1357334746] [2020-08-19 04:30:31,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:31,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:31,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:31,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:31,432 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:31,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1357334746] [2020-08-19 04:30:31,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:31,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 04:30:31,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493248672] [2020-08-19 04:30:31,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 04:30:31,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:31,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 04:30:31,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-19 04:30:31,434 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-19 04:30:31,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:31,864 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-19 04:30:31,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 04:30:31,865 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-19 04:30:31,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:31,865 INFO L225 Difference]: With dead ends: 78 [2020-08-19 04:30:31,865 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 04:30:31,866 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-08-19 04:30:31,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 04:30:31,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-19 04:30:31,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 04:30:31,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-19 04:30:31,872 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-19 04:30:31,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:31,873 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-19 04:30:31,873 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 04:30:31,873 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-19 04:30:31,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 04:30:31,873 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:31,874 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:31,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 04:30:31,874 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:31,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:31,874 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-19 04:30:31,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:31,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1491600720] [2020-08-19 04:30:31,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:31,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:32,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:32,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:32,197 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:32,197 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1491600720] [2020-08-19 04:30:32,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:32,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 04:30:32,198 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567807563] [2020-08-19 04:30:32,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 04:30:32,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:32,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 04:30:32,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-19 04:30:32,200 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-19 04:30:32,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:32,638 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-19 04:30:32,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 04:30:32,638 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-19 04:30:32,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:32,639 INFO L225 Difference]: With dead ends: 82 [2020-08-19 04:30:32,639 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 04:30:32,640 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-19 04:30:32,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 04:30:32,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-19 04:30:32,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 04:30:32,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-19 04:30:32,645 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-19 04:30:32,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:32,646 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-19 04:30:32,646 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 04:30:32,646 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-19 04:30:32,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 04:30:32,647 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:32,647 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:32,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 04:30:32,647 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:32,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:32,648 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-19 04:30:32,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:32,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [835975404] [2020-08-19 04:30:32,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:32,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:32,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:32,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:32,995 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:32,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [835975404] [2020-08-19 04:30:32,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:32,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 04:30:32,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842141289] [2020-08-19 04:30:32,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 04:30:32,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:32,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 04:30:32,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-19 04:30:32,997 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-19 04:30:33,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:33,513 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-19 04:30:33,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 04:30:33,514 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-19 04:30:33,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:33,515 INFO L225 Difference]: With dead ends: 86 [2020-08-19 04:30:33,515 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 04:30:33,516 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-19 04:30:33,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 04:30:33,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-19 04:30:33,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 04:30:33,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-19 04:30:33,529 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-19 04:30:33,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:33,529 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-19 04:30:33,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 04:30:33,530 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-19 04:30:33,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 04:30:33,530 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:33,533 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:33,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 04:30:33,533 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:33,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:33,533 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-19 04:30:33,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:33,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167164349] [2020-08-19 04:30:33,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:33,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:33,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:33,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:33,894 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:33,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167164349] [2020-08-19 04:30:33,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:33,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 04:30:33,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771094162] [2020-08-19 04:30:33,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 04:30:33,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:33,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 04:30:33,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-19 04:30:33,896 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-19 04:30:34,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:34,464 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-19 04:30:34,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 04:30:34,465 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-19 04:30:34,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:34,466 INFO L225 Difference]: With dead ends: 90 [2020-08-19 04:30:34,466 INFO L226 Difference]: Without dead ends: 51 [2020-08-19 04:30:34,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-19 04:30:34,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-19 04:30:34,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-19 04:30:34,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 04:30:34,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-19 04:30:34,476 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-19 04:30:34,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:34,477 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-19 04:30:34,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 04:30:34,478 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-19 04:30:34,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 04:30:34,478 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:34,478 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:34,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 04:30:34,479 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:34,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:34,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-19 04:30:34,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:34,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812710992] [2020-08-19 04:30:34,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:34,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:34,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:34,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:34,865 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:34,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812710992] [2020-08-19 04:30:34,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:34,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 04:30:34,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762914896] [2020-08-19 04:30:34,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 04:30:34,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:34,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 04:30:34,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-19 04:30:34,867 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-19 04:30:35,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:35,518 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-19 04:30:35,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 04:30:35,519 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-19 04:30:35,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:35,520 INFO L225 Difference]: With dead ends: 94 [2020-08-19 04:30:35,520 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 04:30:35,521 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-19 04:30:35,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 04:30:35,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-19 04:30:35,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-19 04:30:35,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-19 04:30:35,527 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-19 04:30:35,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:35,527 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-19 04:30:35,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 04:30:35,527 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-19 04:30:35,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-19 04:30:35,528 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:35,528 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:35,528 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 04:30:35,529 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:35,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:35,529 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-19 04:30:35,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:35,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1971233961] [2020-08-19 04:30:35,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:35,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:35,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:35,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:35,932 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:35,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1971233961] [2020-08-19 04:30:35,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:35,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 04:30:35,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313036687] [2020-08-19 04:30:35,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 04:30:35,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:35,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 04:30:35,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-19 04:30:35,934 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-19 04:30:36,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:36,509 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-19 04:30:36,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 04:30:36,510 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-19 04:30:36,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:36,511 INFO L225 Difference]: With dead ends: 98 [2020-08-19 04:30:36,511 INFO L226 Difference]: Without dead ends: 55 [2020-08-19 04:30:36,511 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-08-19 04:30:36,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-19 04:30:36,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-19 04:30:36,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-19 04:30:36,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-19 04:30:36,517 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-19 04:30:36,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:36,517 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-19 04:30:36,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 04:30:36,518 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-19 04:30:36,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-19 04:30:36,518 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:36,518 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:36,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 04:30:36,518 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:36,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:36,519 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-19 04:30:36,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:36,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [942807701] [2020-08-19 04:30:36,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:36,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:36,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:36,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:36,973 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:36,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [942807701] [2020-08-19 04:30:36,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:36,974 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 04:30:36,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375870137] [2020-08-19 04:30:36,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 04:30:36,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:36,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 04:30:36,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-19 04:30:36,976 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-19 04:30:37,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:37,671 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-19 04:30:37,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 04:30:37,675 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-19 04:30:37,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:37,676 INFO L225 Difference]: With dead ends: 102 [2020-08-19 04:30:37,676 INFO L226 Difference]: Without dead ends: 57 [2020-08-19 04:30:37,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-19 04:30:37,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-19 04:30:37,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-19 04:30:37,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-19 04:30:37,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-19 04:30:37,683 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-19 04:30:37,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:37,683 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-19 04:30:37,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 04:30:37,683 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-19 04:30:37,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-19 04:30:37,684 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:37,684 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:37,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 04:30:37,684 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:37,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:37,685 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-19 04:30:37,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:37,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [774919319] [2020-08-19 04:30:37,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:37,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:38,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:38,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:38,120 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:38,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [774919319] [2020-08-19 04:30:38,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:38,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 04:30:38,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18598241] [2020-08-19 04:30:38,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 04:30:38,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:38,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 04:30:38,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-19 04:30:38,127 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-19 04:30:38,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:38,917 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-19 04:30:38,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 04:30:38,917 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-19 04:30:38,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:38,918 INFO L225 Difference]: With dead ends: 106 [2020-08-19 04:30:38,918 INFO L226 Difference]: Without dead ends: 59 [2020-08-19 04:30:38,919 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-19 04:30:38,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-19 04:30:38,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-19 04:30:38,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-19 04:30:38,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-19 04:30:38,924 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-19 04:30:38,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:38,925 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-19 04:30:38,925 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 04:30:38,925 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-19 04:30:38,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-19 04:30:38,926 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:38,926 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:38,926 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 04:30:38,926 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:38,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:38,926 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-19 04:30:38,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:38,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1502822893] [2020-08-19 04:30:38,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:38,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:39,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:39,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:39,442 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:39,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1502822893] [2020-08-19 04:30:39,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:39,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 04:30:39,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242948664] [2020-08-19 04:30:39,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 04:30:39,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:39,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 04:30:39,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-19 04:30:39,444 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-19 04:30:40,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:40,253 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-19 04:30:40,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 04:30:40,254 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-19 04:30:40,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:40,255 INFO L225 Difference]: With dead ends: 110 [2020-08-19 04:30:40,255 INFO L226 Difference]: Without dead ends: 61 [2020-08-19 04:30:40,255 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2020-08-19 04:30:40,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-19 04:30:40,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-19 04:30:40,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-19 04:30:40,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-19 04:30:40,260 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-19 04:30:40,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:40,261 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-19 04:30:40,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 04:30:40,261 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-19 04:30:40,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-19 04:30:40,262 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:40,262 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:40,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 04:30:40,262 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:40,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:40,262 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-19 04:30:40,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:40,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [790894253] [2020-08-19 04:30:40,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:40,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:40,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:40,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:40,792 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:40,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [790894253] [2020-08-19 04:30:40,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:40,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 04:30:40,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589235946] [2020-08-19 04:30:40,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 04:30:40,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:40,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 04:30:40,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-19 04:30:40,794 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-19 04:30:41,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:41,598 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-19 04:30:41,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 04:30:41,598 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-19 04:30:41,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:41,599 INFO L225 Difference]: With dead ends: 114 [2020-08-19 04:30:41,599 INFO L226 Difference]: Without dead ends: 63 [2020-08-19 04:30:41,600 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-08-19 04:30:41,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-19 04:30:41,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-19 04:30:41,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-19 04:30:41,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-19 04:30:41,605 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-19 04:30:41,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:41,605 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-19 04:30:41,605 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 04:30:41,605 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-19 04:30:41,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-19 04:30:41,605 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:41,606 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:41,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 04:30:41,606 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:41,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:41,606 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-19 04:30:41,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:41,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2092860370] [2020-08-19 04:30:41,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:41,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:42,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:42,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:42,205 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:42,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2092860370] [2020-08-19 04:30:42,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:42,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 04:30:42,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130779491] [2020-08-19 04:30:42,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 04:30:42,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:42,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 04:30:42,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-19 04:30:42,207 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-19 04:30:43,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:43,136 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-19 04:30:43,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 04:30:43,137 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-19 04:30:43,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:43,137 INFO L225 Difference]: With dead ends: 118 [2020-08-19 04:30:43,137 INFO L226 Difference]: Without dead ends: 65 [2020-08-19 04:30:43,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2020-08-19 04:30:43,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-19 04:30:43,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-19 04:30:43,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-19 04:30:43,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-19 04:30:43,144 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-19 04:30:43,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:43,144 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-19 04:30:43,144 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 04:30:43,144 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-19 04:30:43,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-19 04:30:43,145 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:43,145 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:43,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 04:30:43,145 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:43,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:43,146 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-19 04:30:43,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:43,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1164772195] [2020-08-19 04:30:43,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:43,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:43,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:43,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:43,716 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:43,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1164772195] [2020-08-19 04:30:43,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:43,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 04:30:43,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385976609] [2020-08-19 04:30:43,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 04:30:43,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:43,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 04:30:43,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-19 04:30:43,718 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-19 04:30:44,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:44,810 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-19 04:30:44,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 04:30:44,811 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-19 04:30:44,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:44,812 INFO L225 Difference]: With dead ends: 122 [2020-08-19 04:30:44,812 INFO L226 Difference]: Without dead ends: 67 [2020-08-19 04:30:44,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-08-19 04:30:44,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-19 04:30:44,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-19 04:30:44,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-19 04:30:44,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-19 04:30:44,818 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-19 04:30:44,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:44,819 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-19 04:30:44,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 04:30:44,819 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-19 04:30:44,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-19 04:30:44,820 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:44,820 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:44,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 04:30:44,820 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:44,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:44,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-19 04:30:44,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:44,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [953946546] [2020-08-19 04:30:44,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:44,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:45,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:45,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:45,525 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:45,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [953946546] [2020-08-19 04:30:45,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:45,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 04:30:45,526 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794042202] [2020-08-19 04:30:45,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 04:30:45,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:45,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 04:30:45,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-19 04:30:45,527 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-19 04:30:46,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:46,706 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-19 04:30:46,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 04:30:46,710 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-19 04:30:46,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:46,711 INFO L225 Difference]: With dead ends: 126 [2020-08-19 04:30:46,711 INFO L226 Difference]: Without dead ends: 69 [2020-08-19 04:30:46,712 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-19 04:30:46,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-19 04:30:46,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-19 04:30:46,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-19 04:30:46,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-19 04:30:46,717 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-19 04:30:46,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:46,718 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-19 04:30:46,718 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 04:30:46,718 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-19 04:30:46,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-19 04:30:46,718 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:46,719 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:46,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 04:30:46,719 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:46,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:46,719 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-19 04:30:46,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:46,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1886253269] [2020-08-19 04:30:46,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:46,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:47,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:47,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:47,448 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:47,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1886253269] [2020-08-19 04:30:47,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:47,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 04:30:47,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773780707] [2020-08-19 04:30:47,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 04:30:47,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:47,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 04:30:47,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-19 04:30:47,450 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-19 04:30:48,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:48,681 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-19 04:30:48,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 04:30:48,681 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-19 04:30:48,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:48,682 INFO L225 Difference]: With dead ends: 130 [2020-08-19 04:30:48,682 INFO L226 Difference]: Without dead ends: 71 [2020-08-19 04:30:48,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-19 04:30:48,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-19 04:30:48,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-19 04:30:48,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-19 04:30:48,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-19 04:30:48,689 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-19 04:30:48,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:48,689 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-19 04:30:48,689 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 04:30:48,689 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-19 04:30:48,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-19 04:30:48,690 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:48,690 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:48,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 04:30:48,690 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:48,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:48,691 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-19 04:30:48,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:48,691 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2020756307] [2020-08-19 04:30:48,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:48,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:49,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:49,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:49,671 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:49,671 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2020756307] [2020-08-19 04:30:49,671 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:49,671 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 04:30:49,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517297658] [2020-08-19 04:30:49,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 04:30:49,672 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:49,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 04:30:49,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-19 04:30:49,673 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-19 04:30:50,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:50,993 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-19 04:30:50,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 04:30:50,994 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-19 04:30:50,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:50,995 INFO L225 Difference]: With dead ends: 134 [2020-08-19 04:30:50,996 INFO L226 Difference]: Without dead ends: 73 [2020-08-19 04:30:50,996 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-19 04:30:50,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-19 04:30:51,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-19 04:30:51,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-19 04:30:51,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-19 04:30:51,002 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-19 04:30:51,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:51,002 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-19 04:30:51,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 04:30:51,002 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-19 04:30:51,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-19 04:30:51,003 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:51,003 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:51,003 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 04:30:51,004 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:51,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:51,004 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-19 04:30:51,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:51,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [188909638] [2020-08-19 04:30:51,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:51,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:51,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:51,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:51,847 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:51,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [188909638] [2020-08-19 04:30:51,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:51,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 04:30:51,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580995705] [2020-08-19 04:30:51,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 04:30:51,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:51,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 04:30:51,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-19 04:30:51,850 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-19 04:30:53,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:53,288 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-19 04:30:53,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 04:30:53,290 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-19 04:30:53,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:53,291 INFO L225 Difference]: With dead ends: 138 [2020-08-19 04:30:53,291 INFO L226 Difference]: Without dead ends: 75 [2020-08-19 04:30:53,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-19 04:30:53,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-19 04:30:53,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-19 04:30:53,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-19 04:30:53,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-19 04:30:53,298 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-19 04:30:53,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:53,298 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-19 04:30:53,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 04:30:53,298 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-19 04:30:53,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-19 04:30:53,299 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:53,299 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:53,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 04:30:53,299 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:53,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:53,300 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-19 04:30:53,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:53,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [837722482] [2020-08-19 04:30:53,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:53,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:54,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:54,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:54,287 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:54,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [837722482] [2020-08-19 04:30:54,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:54,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 04:30:54,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493883929] [2020-08-19 04:30:54,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 04:30:54,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:54,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 04:30:54,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-19 04:30:54,290 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-19 04:30:56,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:56,033 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-19 04:30:56,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 04:30:56,035 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-19 04:30:56,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:56,036 INFO L225 Difference]: With dead ends: 142 [2020-08-19 04:30:56,036 INFO L226 Difference]: Without dead ends: 77 [2020-08-19 04:30:56,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 04:30:56,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-19 04:30:56,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-19 04:30:56,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-19 04:30:56,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-19 04:30:56,042 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-19 04:30:56,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:56,042 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-19 04:30:56,042 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 04:30:56,043 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-19 04:30:56,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-19 04:30:56,043 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:56,043 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:56,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 04:30:56,044 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:56,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:56,044 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-19 04:30:56,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:56,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1735890510] [2020-08-19 04:30:56,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:56,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:57,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:57,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:57,093 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:57,093 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1735890510] [2020-08-19 04:30:57,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:57,094 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 04:30:57,094 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312502882] [2020-08-19 04:30:57,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 04:30:57,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:57,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 04:30:57,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 04:30:57,095 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-19 04:30:58,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:58,696 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-19 04:30:58,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 04:30:58,697 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-19 04:30:58,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:58,698 INFO L225 Difference]: With dead ends: 146 [2020-08-19 04:30:58,699 INFO L226 Difference]: Without dead ends: 79 [2020-08-19 04:30:58,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 04:30:58,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-19 04:30:58,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-19 04:30:58,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-19 04:30:58,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-19 04:30:58,704 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-19 04:30:58,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:58,705 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-19 04:30:58,705 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 04:30:58,705 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-19 04:30:58,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-19 04:30:58,706 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:58,706 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:58,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 04:30:58,706 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:58,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:58,707 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-19 04:30:58,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:58,707 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1423086429] [2020-08-19 04:30:58,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:58,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:59,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:59,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:59,713 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:59,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1423086429] [2020-08-19 04:30:59,713 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:59,713 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 04:30:59,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978987423] [2020-08-19 04:30:59,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 04:30:59,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:59,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 04:30:59,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 04:30:59,715 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-19 04:31:01,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:01,476 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-19 04:31:01,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 04:31:01,477 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-19 04:31:01,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:01,477 INFO L225 Difference]: With dead ends: 150 [2020-08-19 04:31:01,477 INFO L226 Difference]: Without dead ends: 81 [2020-08-19 04:31:01,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 04:31:01,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-19 04:31:01,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-19 04:31:01,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-19 04:31:01,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-19 04:31:01,485 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-19 04:31:01,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:01,485 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-19 04:31:01,485 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 04:31:01,485 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-19 04:31:01,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-19 04:31:01,486 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:01,486 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:01,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 04:31:01,487 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:01,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:01,487 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-19 04:31:01,487 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:01,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92258787] [2020-08-19 04:31:01,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:01,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:02,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:02,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:02,474 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:02,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92258787] [2020-08-19 04:31:02,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:02,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 04:31:02,476 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942513909] [2020-08-19 04:31:02,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 04:31:02,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:02,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 04:31:02,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 04:31:02,478 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-19 04:31:04,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:04,308 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-19 04:31:04,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 04:31:04,309 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-19 04:31:04,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:04,310 INFO L225 Difference]: With dead ends: 154 [2020-08-19 04:31:04,310 INFO L226 Difference]: Without dead ends: 83 [2020-08-19 04:31:04,311 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 04:31:04,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-19 04:31:04,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-19 04:31:04,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-19 04:31:04,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-19 04:31:04,316 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-19 04:31:04,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:04,317 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-19 04:31:04,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 04:31:04,317 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-19 04:31:04,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-19 04:31:04,318 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:04,318 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:04,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 04:31:04,318 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:04,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:04,319 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-19 04:31:04,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:04,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1014587545] [2020-08-19 04:31:04,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:04,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:05,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:05,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:05,493 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:05,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1014587545] [2020-08-19 04:31:05,493 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:05,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 04:31:05,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705283595] [2020-08-19 04:31:05,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 04:31:05,495 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:05,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 04:31:05,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 04:31:05,496 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-19 04:31:07,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:07,444 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-19 04:31:07,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 04:31:07,445 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-19 04:31:07,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:07,446 INFO L225 Difference]: With dead ends: 158 [2020-08-19 04:31:07,446 INFO L226 Difference]: Without dead ends: 85 [2020-08-19 04:31:07,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 04:31:07,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-19 04:31:07,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-19 04:31:07,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-19 04:31:07,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-19 04:31:07,452 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-19 04:31:07,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:07,453 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-19 04:31:07,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 04:31:07,453 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-19 04:31:07,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-19 04:31:07,454 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:07,454 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:07,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 04:31:07,454 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:07,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:07,454 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-19 04:31:07,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:07,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1181853881] [2020-08-19 04:31:07,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:07,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:08,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:08,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:08,644 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:08,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1181853881] [2020-08-19 04:31:08,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:08,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 04:31:08,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307195377] [2020-08-19 04:31:08,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 04:31:08,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:08,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 04:31:08,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 04:31:08,646 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-19 04:31:10,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:10,611 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-19 04:31:10,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 04:31:10,612 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-19 04:31:10,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:10,612 INFO L225 Difference]: With dead ends: 162 [2020-08-19 04:31:10,613 INFO L226 Difference]: Without dead ends: 87 [2020-08-19 04:31:10,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 04:31:10,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-19 04:31:10,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-19 04:31:10,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-19 04:31:10,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-19 04:31:10,618 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-19 04:31:10,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:10,619 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-19 04:31:10,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 04:31:10,619 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-19 04:31:10,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-19 04:31:10,620 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:10,620 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:10,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 04:31:10,620 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:10,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:10,620 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-19 04:31:10,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:10,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1791416399] [2020-08-19 04:31:10,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:10,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:11,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:11,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:11,878 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:11,879 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1791416399] [2020-08-19 04:31:11,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:11,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 04:31:11,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035648993] [2020-08-19 04:31:11,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 04:31:11,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:11,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 04:31:11,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 04:31:11,881 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-19 04:31:14,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:14,023 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-19 04:31:14,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 04:31:14,025 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-19 04:31:14,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:14,026 INFO L225 Difference]: With dead ends: 166 [2020-08-19 04:31:14,026 INFO L226 Difference]: Without dead ends: 89 [2020-08-19 04:31:14,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 04:31:14,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-19 04:31:14,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-19 04:31:14,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-19 04:31:14,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-19 04:31:14,033 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-19 04:31:14,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:14,033 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-19 04:31:14,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 04:31:14,034 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-19 04:31:14,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-19 04:31:14,034 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:14,034 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:14,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 04:31:14,035 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:14,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:14,035 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-19 04:31:14,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:14,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1612690026] [2020-08-19 04:31:14,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:14,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:15,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:15,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:15,375 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:15,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1612690026] [2020-08-19 04:31:15,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:15,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 04:31:15,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717305995] [2020-08-19 04:31:15,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 04:31:15,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:15,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 04:31:15,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 04:31:15,377 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-19 04:31:17,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:17,627 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-19 04:31:17,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 04:31:17,628 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-19 04:31:17,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:17,629 INFO L225 Difference]: With dead ends: 170 [2020-08-19 04:31:17,629 INFO L226 Difference]: Without dead ends: 91 [2020-08-19 04:31:17,631 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 04:31:17,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-19 04:31:17,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-19 04:31:17,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-19 04:31:17,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-19 04:31:17,637 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-19 04:31:17,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:17,638 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-19 04:31:17,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 04:31:17,638 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-19 04:31:17,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-19 04:31:17,639 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:17,639 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:17,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 04:31:17,639 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:17,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:17,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-19 04:31:17,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:17,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [383436750] [2020-08-19 04:31:17,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:17,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:19,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:19,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:19,051 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:19,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [383436750] [2020-08-19 04:31:19,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:19,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 04:31:19,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540207141] [2020-08-19 04:31:19,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 04:31:19,052 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:19,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 04:31:19,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 04:31:19,053 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-19 04:31:21,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:21,446 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-19 04:31:21,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 04:31:21,449 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-19 04:31:21,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:21,450 INFO L225 Difference]: With dead ends: 174 [2020-08-19 04:31:21,450 INFO L226 Difference]: Without dead ends: 93 [2020-08-19 04:31:21,451 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 04:31:21,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-19 04:31:21,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-19 04:31:21,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-19 04:31:21,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-19 04:31:21,457 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-19 04:31:21,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:21,457 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-19 04:31:21,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 04:31:21,457 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-19 04:31:21,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-19 04:31:21,458 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:21,458 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:21,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 04:31:21,458 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:21,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:21,459 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-19 04:31:21,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:21,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1362138704] [2020-08-19 04:31:21,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:21,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:22,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:22,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:22,939 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:22,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1362138704] [2020-08-19 04:31:22,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:22,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 04:31:22,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676572629] [2020-08-19 04:31:22,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 04:31:22,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:22,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 04:31:22,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 04:31:22,942 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states.