/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=BIGGEST -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 [2020-08-18 18:00:26,248 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 18:00:26,251 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 18:00:26,276 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 18:00:26,276 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 18:00:26,277 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 18:00:26,279 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 18:00:26,281 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 18:00:26,282 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 18:00:26,283 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 18:00:26,284 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 18:00:26,285 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 18:00:26,285 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 18:00:26,286 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 18:00:26,287 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 18:00:26,289 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 18:00:26,289 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 18:00:26,290 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 18:00:26,292 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 18:00:26,294 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 18:00:26,295 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 18:00:26,296 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 18:00:26,297 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 18:00:26,298 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 18:00:26,300 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 18:00:26,301 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 18:00:26,301 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 18:00:26,302 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 18:00:26,302 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 18:00:26,303 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 18:00:26,303 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 18:00:26,304 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 18:00:26,305 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 18:00:26,305 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 18:00:26,306 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 18:00:26,307 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 18:00:26,307 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 18:00:26,308 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 18:00:26,308 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 18:00:26,309 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 18:00:26,309 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 18:00:26,310 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 18:00:26,353 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 18:00:26,353 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 18:00:26,357 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 18:00:26,358 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 18:00:26,358 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 18:00:26,358 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 18:00:26,358 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 18:00:26,359 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 18:00:26,359 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 18:00:26,359 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 18:00:26,359 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 18:00:26,359 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 18:00:26,359 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 18:00:26,360 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 18:00:26,360 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 18:00:26,360 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 18:00:26,360 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 18:00:26,360 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 18:00:26,361 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 18:00:26,364 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 18:00:26,364 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 18:00:26,364 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 18:00:26,364 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 18:00:26,365 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 18:00:26,365 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 18:00:26,365 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 18:00:26,365 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 18:00:26,365 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 18:00:26,366 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 18:00:26,366 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=BIGGEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=BIGGEST; [2020-08-18 18:00:26,704 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 18:00:26,727 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 18:00:26,733 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 18:00:26,735 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 18:00:26,735 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 18:00:26,737 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 18:00:26,802 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9e51ca672/a8c910542a6744c6bf974e066ac97038/FLAGe996da697 [2020-08-18 18:00:27,252 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 18:00:27,253 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 18:00:27,260 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9e51ca672/a8c910542a6744c6bf974e066ac97038/FLAGe996da697 [2020-08-18 18:00:27,635 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9e51ca672/a8c910542a6744c6bf974e066ac97038 [2020-08-18 18:00:27,644 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 18:00:27,646 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 18:00:27,646 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 18:00:27,647 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 18:00:27,650 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 18:00:27,651 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:00:27" (1/1) ... [2020-08-18 18:00:27,654 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@76ffca71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:27, skipping insertion in model container [2020-08-18 18:00:27,655 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:00:27" (1/1) ... [2020-08-18 18:00:27,663 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 18:00:27,681 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 18:00:27,856 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:00:27,898 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 18:00:27,917 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:00:28,071 INFO L208 MainTranslator]: Completed translation [2020-08-18 18:00:28,072 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:28 WrapperNode [2020-08-18 18:00:28,072 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 18:00:28,073 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 18:00:28,073 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 18:00:28,073 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 18:00:28,087 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:28" (1/1) ... [2020-08-18 18:00:28,087 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:28" (1/1) ... [2020-08-18 18:00:28,096 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:28" (1/1) ... [2020-08-18 18:00:28,096 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:28" (1/1) ... [2020-08-18 18:00:28,104 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:28" (1/1) ... [2020-08-18 18:00:28,109 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:28" (1/1) ... [2020-08-18 18:00:28,111 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:28" (1/1) ... [2020-08-18 18:00:28,113 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 18:00:28,113 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 18:00:28,113 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 18:00:28,114 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 18:00:28,114 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:28" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 18:00:28,179 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 18:00:28,179 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 18:00:28,179 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 18:00:28,179 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 18:00:28,180 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 18:00:28,180 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 18:00:28,180 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 18:00:28,180 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 18:00:28,180 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 18:00:28,180 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-18 18:00:28,181 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 18:00:28,181 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 18:00:28,421 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 18:00:28,421 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 18:00:28,426 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:00:28 BoogieIcfgContainer [2020-08-18 18:00:28,426 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 18:00:28,427 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 18:00:28,428 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 18:00:28,431 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 18:00:28,431 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 06:00:27" (1/3) ... [2020-08-18 18:00:28,432 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@445671ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:00:28, skipping insertion in model container [2020-08-18 18:00:28,433 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:28" (2/3) ... [2020-08-18 18:00:28,433 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@445671ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:00:28, skipping insertion in model container [2020-08-18 18:00:28,433 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:00:28" (3/3) ... [2020-08-18 18:00:28,435 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-18 18:00:28,447 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 18:00:28,455 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 18:00:28,476 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 18:00:28,507 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 18:00:28,507 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 18:00:28,507 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 18:00:28,508 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 18:00:28,508 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 18:00:28,508 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 18:00:28,509 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 18:00:28,509 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 18:00:28,541 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-18 18:00:28,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 18:00:28,559 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:28,561 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:28,561 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:28,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:28,568 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-18 18:00:28,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:28,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1795413781] [2020-08-18 18:00:28,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:28,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:28,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:28,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:28,803 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:28,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1795413781] [2020-08-18 18:00:28,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:00:28,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 18:00:28,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193819182] [2020-08-18 18:00:28,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 18:00:28,812 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:28,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 18:00:28,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 18:00:28,827 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-18 18:00:28,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:28,932 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-18 18:00:28,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 18:00:28,934 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-18 18:00:28,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:28,944 INFO L225 Difference]: With dead ends: 42 [2020-08-18 18:00:28,944 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 18:00:28,948 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 [2020-08-18 18:00:28,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 18:00:28,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-18 18:00:28,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 18:00:28,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 18:00:28,984 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-18 18:00:28,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:28,985 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 18:00:28,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 18:00:28,985 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 18:00:28,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 18:00:28,986 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:28,986 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:28,986 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 18:00:28,987 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:28,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:28,987 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-18 18:00:28,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:28,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [118683677] [2020-08-18 18:00:28,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:29,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:29,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:29,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:29,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:29,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [118683677] [2020-08-18 18:00:29,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:00:29,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 18:00:29,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124356766] [2020-08-18 18:00:29,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 18:00:29,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:29,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 18:00:29,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 18:00:29,078 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-18 18:00:29,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:29,192 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-18 18:00:29,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:00:29,193 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-18 18:00:29,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:29,194 INFO L225 Difference]: With dead ends: 36 [2020-08-18 18:00:29,194 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 18:00:29,195 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 [2020-08-18 18:00:29,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 18:00:29,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-18 18:00:29,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 18:00:29,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 18:00:29,202 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-18 18:00:29,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:29,202 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 18:00:29,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 18:00:29,203 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 18:00:29,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 18:00:29,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:29,204 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:29,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 18:00:29,204 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:29,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:29,205 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-18 18:00:29,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:29,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1736393187] [2020-08-18 18:00:29,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:29,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:29,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:29,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:29,301 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:29,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1736393187] [2020-08-18 18:00:29,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:00:29,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 18:00:29,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186514665] [2020-08-18 18:00:29,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 18:00:29,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:29,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 18:00:29,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 18:00:29,307 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-18 18:00:29,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:29,417 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-18 18:00:29,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:00:29,418 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-18 18:00:29,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:29,419 INFO L225 Difference]: With dead ends: 40 [2020-08-18 18:00:29,420 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 18:00:29,420 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 [2020-08-18 18:00:29,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 18:00:29,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-18 18:00:29,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 18:00:29,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-18 18:00:29,427 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-18 18:00:29,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:29,428 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-18 18:00:29,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 18:00:29,428 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-18 18:00:29,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 18:00:29,429 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:29,429 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:29,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 18:00:29,430 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:29,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:29,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-18 18:00:29,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:29,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574018748] [2020-08-18 18:00:29,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:29,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:29,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:29,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:29,516 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:29,516 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574018748] [2020-08-18 18:00:29,517 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:00:29,517 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 18:00:29,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366723444] [2020-08-18 18:00:29,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 18:00:29,518 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:29,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 18:00:29,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 18:00:29,519 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-18 18:00:29,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:29,592 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-18 18:00:29,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:00:29,593 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-18 18:00:29,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:29,594 INFO L225 Difference]: With dead ends: 31 [2020-08-18 18:00:29,594 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 18:00:29,595 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 [2020-08-18 18:00:29,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 18:00:29,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-18 18:00:29,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 18:00:29,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-18 18:00:29,601 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-18 18:00:29,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:29,602 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-18 18:00:29,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 18:00:29,602 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-18 18:00:29,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 18:00:29,603 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:29,603 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:29,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 18:00:29,604 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:29,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:29,604 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-18 18:00:29,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:29,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [715886766] [2020-08-18 18:00:29,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:29,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:29,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:29,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:29,744 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:29,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [715886766] [2020-08-18 18:00:29,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:29,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 18:00:29,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359411135] [2020-08-18 18:00:29,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 18:00:29,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:29,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 18:00:29,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 18:00:29,750 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-18 18:00:29,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:29,866 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-18 18:00:29,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 18:00:29,868 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-18 18:00:29,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:29,869 INFO L225 Difference]: With dead ends: 34 [2020-08-18 18:00:29,869 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 18:00:29,870 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 [2020-08-18 18:00:29,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 18:00:29,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-18 18:00:29,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 18:00:29,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-18 18:00:29,886 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-18 18:00:29,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:29,886 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-18 18:00:29,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 18:00:29,887 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-18 18:00:29,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 18:00:29,889 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:29,890 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:29,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 18:00:29,891 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:29,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:29,891 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-18 18:00:29,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:29,893 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [247739983] [2020-08-18 18:00:29,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:29,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:30,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:30,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:30,094 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:30,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [247739983] [2020-08-18 18:00:30,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:30,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 18:00:30,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146516597] [2020-08-18 18:00:30,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 18:00:30,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:30,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 18:00:30,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 18:00:30,097 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-18 18:00:30,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:30,184 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-18 18:00:30,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 18:00:30,185 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-18 18:00:30,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:30,186 INFO L225 Difference]: With dead ends: 38 [2020-08-18 18:00:30,186 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 18:00:30,187 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 [2020-08-18 18:00:30,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 18:00:30,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-18 18:00:30,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 18:00:30,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-18 18:00:30,192 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-18 18:00:30,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:30,193 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-18 18:00:30,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 18:00:30,193 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-18 18:00:30,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 18:00:30,194 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:30,194 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:30,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 18:00:30,195 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:30,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:30,195 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-18 18:00:30,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:30,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [67527032] [2020-08-18 18:00:30,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:30,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:30,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:30,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:30,328 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:30,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [67527032] [2020-08-18 18:00:30,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:30,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 18:00:30,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100755399] [2020-08-18 18:00:30,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 18:00:30,331 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:30,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 18:00:30,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 18:00:30,332 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-18 18:00:30,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:30,452 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-18 18:00:30,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 18:00:30,453 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-18 18:00:30,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:30,454 INFO L225 Difference]: With dead ends: 42 [2020-08-18 18:00:30,454 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 18:00:30,456 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 [2020-08-18 18:00:30,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 18:00:30,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-18 18:00:30,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 18:00:30,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-18 18:00:30,468 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-18 18:00:30,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:30,469 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-18 18:00:30,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 18:00:30,469 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-18 18:00:30,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 18:00:30,470 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:30,470 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:30,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 18:00:30,471 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:30,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:30,471 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-18 18:00:30,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:30,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1709945545] [2020-08-18 18:00:30,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:30,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:30,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:30,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:30,666 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:30,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1709945545] [2020-08-18 18:00:30,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:30,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 18:00:30,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269858237] [2020-08-18 18:00:30,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 18:00:30,668 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:30,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 18:00:30,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 18:00:30,669 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-18 18:00:30,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:30,790 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-18 18:00:30,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 18:00:30,791 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-18 18:00:30,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:30,792 INFO L225 Difference]: With dead ends: 46 [2020-08-18 18:00:30,792 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 18:00:30,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-18 18:00:30,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 18:00:30,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-18 18:00:30,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 18:00:30,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-18 18:00:30,799 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-18 18:00:30,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:30,799 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-18 18:00:30,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 18:00:30,800 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-18 18:00:30,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 18:00:30,800 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:30,801 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:30,801 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 18:00:30,801 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:30,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:30,802 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-18 18:00:30,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:30,802 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998749427] [2020-08-18 18:00:30,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:30,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:30,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:30,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:30,937 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:30,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998749427] [2020-08-18 18:00:30,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:30,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 18:00:30,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124786357] [2020-08-18 18:00:30,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 18:00:30,939 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:30,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 18:00:30,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-18 18:00:30,940 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-18 18:00:31,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:31,094 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-18 18:00:31,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 18:00:31,094 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-18 18:00:31,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:31,095 INFO L225 Difference]: With dead ends: 50 [2020-08-18 18:00:31,095 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 18:00:31,096 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 [2020-08-18 18:00:31,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 18:00:31,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 18:00:31,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 18:00:31,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-18 18:00:31,102 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-18 18:00:31,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:31,103 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-18 18:00:31,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 18:00:31,103 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-18 18:00:31,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 18:00:31,104 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:31,104 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:31,104 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 18:00:31,104 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:31,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:31,105 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-18 18:00:31,105 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:31,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [658180311] [2020-08-18 18:00:31,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:31,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:31,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:31,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:31,289 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:31,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [658180311] [2020-08-18 18:00:31,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:31,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 18:00:31,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678934475] [2020-08-18 18:00:31,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 18:00:31,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:31,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 18:00:31,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-18 18:00:31,292 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-18 18:00:31,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:31,534 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-18 18:00:31,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 18:00:31,534 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-18 18:00:31,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:31,536 INFO L225 Difference]: With dead ends: 54 [2020-08-18 18:00:31,536 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 18:00:31,536 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 [2020-08-18 18:00:31,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 18:00:31,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-18 18:00:31,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 18:00:31,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-18 18:00:31,543 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-18 18:00:31,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:31,543 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-18 18:00:31,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 18:00:31,543 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-18 18:00:31,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 18:00:31,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:31,544 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:31,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 18:00:31,545 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:31,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:31,545 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-18 18:00:31,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:31,546 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1032063983] [2020-08-18 18:00:31,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:31,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:31,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:31,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:31,719 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:31,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1032063983] [2020-08-18 18:00:31,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:31,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 18:00:31,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809813647] [2020-08-18 18:00:31,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 18:00:31,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:31,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 18:00:31,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-18 18:00:31,722 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-18 18:00:31,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:31,929 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-18 18:00:31,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 18:00:31,930 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-18 18:00:31,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:31,931 INFO L225 Difference]: With dead ends: 58 [2020-08-18 18:00:31,931 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 18:00:31,934 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 [2020-08-18 18:00:31,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 18:00:31,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-18 18:00:31,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 18:00:31,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-18 18:00:31,942 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-18 18:00:31,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:31,943 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-18 18:00:31,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 18:00:31,943 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-18 18:00:31,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 18:00:31,945 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:31,946 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:31,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 18:00:31,946 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:31,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:31,947 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-18 18:00:31,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:31,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1690807154] [2020-08-18 18:00:31,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:31,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:32,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:32,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:32,167 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:32,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1690807154] [2020-08-18 18:00:32,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:32,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 18:00:32,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90979457] [2020-08-18 18:00:32,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 18:00:32,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:32,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 18:00:32,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-18 18:00:32,170 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-18 18:00:32,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:32,392 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-18 18:00:32,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 18:00:32,393 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-18 18:00:32,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:32,394 INFO L225 Difference]: With dead ends: 62 [2020-08-18 18:00:32,394 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 18:00:32,394 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 [2020-08-18 18:00:32,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 18:00:32,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-18 18:00:32,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 18:00:32,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-18 18:00:32,403 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-18 18:00:32,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:32,403 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-18 18:00:32,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 18:00:32,403 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-18 18:00:32,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 18:00:32,407 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:32,407 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:32,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 18:00:32,407 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:32,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:32,409 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-18 18:00:32,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:32,410 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692015130] [2020-08-18 18:00:32,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:32,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:32,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:32,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:32,672 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:32,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692015130] [2020-08-18 18:00:32,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:32,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 18:00:32,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583216023] [2020-08-18 18:00:32,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 18:00:32,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:32,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 18:00:32,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-18 18:00:32,675 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-18 18:00:32,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:32,929 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-18 18:00:32,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 18:00:32,930 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-18 18:00:32,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:32,931 INFO L225 Difference]: With dead ends: 66 [2020-08-18 18:00:32,931 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 18:00:32,932 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 [2020-08-18 18:00:32,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 18:00:32,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-18 18:00:32,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 18:00:32,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-18 18:00:32,938 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-18 18:00:32,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:32,938 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-18 18:00:32,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 18:00:32,938 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-18 18:00:32,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 18:00:32,939 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:32,939 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:32,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 18:00:32,940 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:32,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:32,940 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-18 18:00:32,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:32,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [119671070] [2020-08-18 18:00:32,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:32,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:33,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:33,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:33,179 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:33,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [119671070] [2020-08-18 18:00:33,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:33,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 18:00:33,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9939694] [2020-08-18 18:00:33,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 18:00:33,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:33,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 18:00:33,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-18 18:00:33,183 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-18 18:00:33,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:33,487 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-18 18:00:33,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 18:00:33,488 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-18 18:00:33,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:33,489 INFO L225 Difference]: With dead ends: 70 [2020-08-18 18:00:33,489 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 18:00:33,491 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 [2020-08-18 18:00:33,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 18:00:33,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-18 18:00:33,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 18:00:33,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-18 18:00:33,505 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-18 18:00:33,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:33,505 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-18 18:00:33,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 18:00:33,505 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-18 18:00:33,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 18:00:33,506 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:33,506 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:33,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 18:00:33,508 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:33,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:33,508 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-18 18:00:33,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:33,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1128590215] [2020-08-18 18:00:33,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:33,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:33,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:33,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:33,781 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:33,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1128590215] [2020-08-18 18:00:33,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:33,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 18:00:33,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479591652] [2020-08-18 18:00:33,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 18:00:33,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:33,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 18:00:33,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-18 18:00:33,784 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-18 18:00:34,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:34,161 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-18 18:00:34,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 18:00:34,161 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-18 18:00:34,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:34,163 INFO L225 Difference]: With dead ends: 74 [2020-08-18 18:00:34,163 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 18:00:34,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-18 18:00:34,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 18:00:34,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-18 18:00:34,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 18:00:34,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-18 18:00:34,171 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-18 18:00:34,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:34,171 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-18 18:00:34,172 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 18:00:34,172 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-18 18:00:34,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 18:00:34,172 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:34,173 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:34,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 18:00:34,173 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:34,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:34,174 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-18 18:00:34,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:34,174 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1197167829] [2020-08-18 18:00:34,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:34,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:34,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:34,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:34,461 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:34,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1197167829] [2020-08-18 18:00:34,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:34,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 18:00:34,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031987988] [2020-08-18 18:00:34,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 18:00:34,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:34,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 18:00:34,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-18 18:00:34,467 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-18 18:00:34,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:34,847 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-18 18:00:34,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 18:00:34,853 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-18 18:00:34,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:34,854 INFO L225 Difference]: With dead ends: 78 [2020-08-18 18:00:34,854 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 18:00:34,855 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 [2020-08-18 18:00:34,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 18:00:34,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-18 18:00:34,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 18:00:34,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-18 18:00:34,861 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-18 18:00:34,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:34,861 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-18 18:00:34,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 18:00:34,861 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-18 18:00:34,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 18:00:34,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:34,862 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:34,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 18:00:34,862 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:34,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:34,863 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-18 18:00:34,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:34,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1972998112] [2020-08-18 18:00:34,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:34,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:35,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:35,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:35,141 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:35,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1972998112] [2020-08-18 18:00:35,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:35,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 18:00:35,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333841144] [2020-08-18 18:00:35,143 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 18:00:35,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:35,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 18:00:35,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-18 18:00:35,145 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-18 18:00:35,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:35,510 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-18 18:00:35,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 18:00:35,511 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-18 18:00:35,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:35,511 INFO L225 Difference]: With dead ends: 82 [2020-08-18 18:00:35,511 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 18:00:35,512 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 [2020-08-18 18:00:35,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 18:00:35,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-18 18:00:35,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 18:00:35,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-18 18:00:35,517 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-18 18:00:35,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:35,517 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-18 18:00:35,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 18:00:35,517 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-18 18:00:35,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 18:00:35,518 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:35,518 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:35,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 18:00:35,518 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:35,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:35,519 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-18 18:00:35,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:35,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1953229176] [2020-08-18 18:00:35,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:35,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:35,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:35,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:35,855 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:35,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1953229176] [2020-08-18 18:00:35,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:35,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 18:00:35,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780480331] [2020-08-18 18:00:35,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 18:00:35,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:35,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 18:00:35,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-18 18:00:35,857 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-18 18:00:36,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:36,366 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-18 18:00:36,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 18:00:36,366 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-18 18:00:36,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:36,367 INFO L225 Difference]: With dead ends: 86 [2020-08-18 18:00:36,367 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 18:00:36,368 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-18 18:00:36,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 18:00:36,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-18 18:00:36,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 18:00:36,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-18 18:00:36,374 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-18 18:00:36,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:36,374 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-18 18:00:36,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 18:00:36,375 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-18 18:00:36,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 18:00:36,375 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:36,375 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:36,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 18:00:36,376 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:36,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:36,376 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-18 18:00:36,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:36,376 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2012302298] [2020-08-18 18:00:36,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:36,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:36,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:36,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:36,725 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:36,726 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2012302298] [2020-08-18 18:00:36,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:36,726 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 18:00:36,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304131302] [2020-08-18 18:00:36,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 18:00:36,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:36,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 18:00:36,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-18 18:00:36,729 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-18 18:00:37,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:37,289 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-18 18:00:37,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 18:00:37,289 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-18 18:00:37,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:37,290 INFO L225 Difference]: With dead ends: 90 [2020-08-18 18:00:37,290 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 18:00:37,291 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-18 18:00:37,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 18:00:37,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-18 18:00:37,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 18:00:37,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-18 18:00:37,297 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-18 18:00:37,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:37,297 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-18 18:00:37,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 18:00:37,298 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-18 18:00:37,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 18:00:37,298 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:37,298 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:37,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 18:00:37,299 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:37,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:37,299 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-18 18:00:37,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:37,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [966534271] [2020-08-18 18:00:37,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:37,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:37,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:37,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:37,662 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:37,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [966534271] [2020-08-18 18:00:37,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:37,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 18:00:37,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173346829] [2020-08-18 18:00:37,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 18:00:37,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:37,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 18:00:37,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-18 18:00:37,665 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-18 18:00:38,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:38,270 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-18 18:00:38,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 18:00:38,271 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-18 18:00:38,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:38,271 INFO L225 Difference]: With dead ends: 94 [2020-08-18 18:00:38,271 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 18:00:38,273 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 [2020-08-18 18:00:38,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 18:00:38,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-18 18:00:38,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 18:00:38,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-18 18:00:38,279 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-18 18:00:38,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:38,280 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-18 18:00:38,280 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 18:00:38,280 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-18 18:00:38,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 18:00:38,281 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:38,281 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:38,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 18:00:38,281 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:38,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:38,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-18 18:00:38,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:38,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230180881] [2020-08-18 18:00:38,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:38,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:38,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:38,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:38,693 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:38,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [230180881] [2020-08-18 18:00:38,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:38,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 18:00:38,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400677959] [2020-08-18 18:00:38,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 18:00:38,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:38,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 18:00:38,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-18 18:00:38,696 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-18 18:00:39,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:39,265 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-18 18:00:39,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 18:00:39,265 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-18 18:00:39,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:39,266 INFO L225 Difference]: With dead ends: 98 [2020-08-18 18:00:39,266 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 18:00:39,267 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 [2020-08-18 18:00:39,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 18:00:39,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-18 18:00:39,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 18:00:39,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-18 18:00:39,277 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-18 18:00:39,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:39,277 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-18 18:00:39,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 18:00:39,277 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-18 18:00:39,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 18:00:39,278 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:39,278 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:39,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 18:00:39,278 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:39,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:39,279 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-18 18:00:39,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:39,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [12342720] [2020-08-18 18:00:39,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:39,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:39,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:39,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:39,723 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:39,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [12342720] [2020-08-18 18:00:39,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:39,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 18:00:39,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364192678] [2020-08-18 18:00:39,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 18:00:39,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:39,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 18:00:39,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-18 18:00:39,726 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-18 18:00:40,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:40,361 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-18 18:00:40,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 18:00:40,367 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-18 18:00:40,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:40,368 INFO L225 Difference]: With dead ends: 102 [2020-08-18 18:00:40,368 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 18:00:40,369 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-18 18:00:40,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 18:00:40,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-18 18:00:40,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 18:00:40,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-18 18:00:40,377 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-18 18:00:40,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:40,378 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-18 18:00:40,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 18:00:40,378 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-18 18:00:40,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 18:00:40,378 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:40,378 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:40,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 18:00:40,380 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:40,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:40,380 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-18 18:00:40,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:40,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1232602887] [2020-08-18 18:00:40,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:40,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:40,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:40,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:40,849 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:40,850 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1232602887] [2020-08-18 18:00:40,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:40,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 18:00:40,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973808283] [2020-08-18 18:00:40,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 18:00:40,851 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:40,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 18:00:40,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-18 18:00:40,852 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-18 18:00:41,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:41,617 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-18 18:00:41,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 18:00:41,622 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-18 18:00:41,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:41,623 INFO L225 Difference]: With dead ends: 106 [2020-08-18 18:00:41,623 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 18:00:41,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-18 18:00:41,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 18:00:41,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-18 18:00:41,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 18:00:41,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-18 18:00:41,628 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-18 18:00:41,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:41,629 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-18 18:00:41,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 18:00:41,629 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-18 18:00:41,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 18:00:41,630 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:41,630 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:41,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 18:00:41,630 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:41,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:41,630 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-18 18:00:41,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:41,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [525761639] [2020-08-18 18:00:41,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:41,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:42,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:42,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:42,158 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:42,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [525761639] [2020-08-18 18:00:42,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:42,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 18:00:42,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78610545] [2020-08-18 18:00:42,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 18:00:42,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:42,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 18:00:42,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-18 18:00:42,161 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-18 18:00:42,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:42,934 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-18 18:00:42,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 18:00:42,934 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-18 18:00:42,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:42,935 INFO L225 Difference]: With dead ends: 110 [2020-08-18 18:00:42,935 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 18:00:42,936 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 [2020-08-18 18:00:42,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 18:00:42,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-18 18:00:42,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 18:00:42,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-18 18:00:42,941 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-18 18:00:42,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:42,941 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-18 18:00:42,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 18:00:42,942 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-18 18:00:42,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 18:00:42,942 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:42,942 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:42,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 18:00:42,943 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:42,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:42,943 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-18 18:00:42,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:42,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [51287676] [2020-08-18 18:00:42,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:42,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:43,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:43,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:43,474 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:43,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [51287676] [2020-08-18 18:00:43,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:43,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 18:00:43,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624598500] [2020-08-18 18:00:43,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 18:00:43,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:43,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 18:00:43,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-18 18:00:43,476 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-18 18:00:44,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:44,288 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-18 18:00:44,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 18:00:44,289 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-18 18:00:44,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:44,289 INFO L225 Difference]: With dead ends: 114 [2020-08-18 18:00:44,290 INFO L226 Difference]: Without dead ends: 63 [2020-08-18 18:00:44,290 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 [2020-08-18 18:00:44,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-18 18:00:44,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-18 18:00:44,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-18 18:00:44,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-18 18:00:44,296 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-18 18:00:44,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:44,296 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-18 18:00:44,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 18:00:44,296 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-18 18:00:44,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-18 18:00:44,297 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:44,297 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:44,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 18:00:44,297 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:44,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:44,298 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-18 18:00:44,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:44,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2093044193] [2020-08-18 18:00:44,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:44,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:44,905 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:44,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:44,914 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:44,914 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2093044193] [2020-08-18 18:00:44,914 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:44,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 18:00:44,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73971431] [2020-08-18 18:00:44,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 18:00:44,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:44,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 18:00:44,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-18 18:00:44,916 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-18 18:00:45,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:45,849 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-18 18:00:45,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 18:00:45,849 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-18 18:00:45,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:45,850 INFO L225 Difference]: With dead ends: 118 [2020-08-18 18:00:45,850 INFO L226 Difference]: Without dead ends: 65 [2020-08-18 18:00:45,851 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 [2020-08-18 18:00:45,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-18 18:00:45,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-18 18:00:45,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-18 18:00:45,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-18 18:00:45,857 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-18 18:00:45,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:45,857 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-18 18:00:45,857 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 18:00:45,857 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-18 18:00:45,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-18 18:00:45,858 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:45,858 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:45,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 18:00:45,858 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:45,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:45,859 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-18 18:00:45,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:45,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1236835786] [2020-08-18 18:00:45,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:45,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:46,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:46,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:46,466 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:46,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1236835786] [2020-08-18 18:00:46,467 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:46,467 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 18:00:46,467 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632744260] [2020-08-18 18:00:46,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 18:00:46,468 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:46,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 18:00:46,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-18 18:00:46,468 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-18 18:00:47,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:47,593 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-18 18:00:47,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 18:00:47,594 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-18 18:00:47,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:47,595 INFO L225 Difference]: With dead ends: 122 [2020-08-18 18:00:47,595 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 18:00:47,597 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 [2020-08-18 18:00:47,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 18:00:47,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-18 18:00:47,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 18:00:47,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-18 18:00:47,602 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-18 18:00:47,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:47,602 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-18 18:00:47,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 18:00:47,603 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-18 18:00:47,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 18:00:47,603 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:47,603 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:47,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 18:00:47,604 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:47,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:47,604 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-18 18:00:47,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:47,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1647950777] [2020-08-18 18:00:47,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:47,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:48,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:48,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:48,261 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:48,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1647950777] [2020-08-18 18:00:48,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:48,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 18:00:48,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589381160] [2020-08-18 18:00:48,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 18:00:48,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:48,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 18:00:48,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-18 18:00:48,263 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-18 18:00:49,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:49,371 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-18 18:00:49,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 18:00:49,374 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-18 18:00:49,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:49,375 INFO L225 Difference]: With dead ends: 126 [2020-08-18 18:00:49,375 INFO L226 Difference]: Without dead ends: 69 [2020-08-18 18:00:49,375 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 [2020-08-18 18:00:49,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-18 18:00:49,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-18 18:00:49,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-18 18:00:49,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-18 18:00:49,380 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-18 18:00:49,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:49,380 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-18 18:00:49,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 18:00:49,380 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-18 18:00:49,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-18 18:00:49,380 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:49,380 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:49,381 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 18:00:49,381 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:49,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:49,381 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-18 18:00:49,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:49,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1146167359] [2020-08-18 18:00:49,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:49,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:50,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:50,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:50,104 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:50,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1146167359] [2020-08-18 18:00:50,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:50,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 18:00:50,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938483894] [2020-08-18 18:00:50,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 18:00:50,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:50,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 18:00:50,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-18 18:00:50,107 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-18 18:00:51,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:51,339 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-18 18:00:51,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 18:00:51,343 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-18 18:00:51,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:51,344 INFO L225 Difference]: With dead ends: 130 [2020-08-18 18:00:51,344 INFO L226 Difference]: Without dead ends: 71 [2020-08-18 18:00:51,344 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 [2020-08-18 18:00:51,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-18 18:00:51,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-18 18:00:51,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-18 18:00:51,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-18 18:00:51,350 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-18 18:00:51,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:51,350 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-18 18:00:51,350 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 18:00:51,350 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-18 18:00:51,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-18 18:00:51,351 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:51,351 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:51,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 18:00:51,351 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:51,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:51,352 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-18 18:00:51,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:51,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [163576674] [2020-08-18 18:00:51,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:51,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:52,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:52,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:52,070 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:52,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [163576674] [2020-08-18 18:00:52,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:52,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 18:00:52,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845531870] [2020-08-18 18:00:52,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 18:00:52,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:52,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 18:00:52,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-18 18:00:52,073 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-18 18:00:53,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:53,407 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-18 18:00:53,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 18:00:53,411 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-18 18:00:53,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:53,412 INFO L225 Difference]: With dead ends: 134 [2020-08-18 18:00:53,412 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 18:00:53,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-18 18:00:53,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 18:00:53,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-18 18:00:53,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 18:00:53,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-18 18:00:53,421 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-18 18:00:53,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:53,421 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-18 18:00:53,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 18:00:53,421 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-18 18:00:53,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 18:00:53,422 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:53,422 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:53,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 18:00:53,422 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:53,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:53,423 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-18 18:00:53,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:53,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1005733300] [2020-08-18 18:00:53,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:53,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:54,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:54,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:54,438 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:54,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1005733300] [2020-08-18 18:00:54,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:54,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 18:00:54,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852969416] [2020-08-18 18:00:54,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 18:00:54,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:54,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 18:00:54,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-18 18:00:54,441 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-18 18:00:56,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:56,009 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-18 18:00:56,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 18:00:56,010 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-18 18:00:56,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:56,011 INFO L225 Difference]: With dead ends: 138 [2020-08-18 18:00:56,011 INFO L226 Difference]: Without dead ends: 75 [2020-08-18 18:00:56,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-18 18:00:56,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-18 18:00:56,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-18 18:00:56,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-18 18:00:56,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-18 18:00:56,017 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-18 18:00:56,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:56,017 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-18 18:00:56,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 18:00:56,017 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-18 18:00:56,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-18 18:00:56,018 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:56,018 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:56,018 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 18:00:56,019 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:56,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:56,019 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-18 18:00:56,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:56,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1971601443] [2020-08-18 18:00:56,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:56,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:56,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:56,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:56,963 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:56,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1971601443] [2020-08-18 18:00:56,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:56,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 18:00:56,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525268125] [2020-08-18 18:00:56,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 18:00:56,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:56,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 18:00:56,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-18 18:00:56,965 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-18 18:00:58,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:58,439 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-18 18:00:58,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 18:00:58,441 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-18 18:00:58,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:58,442 INFO L225 Difference]: With dead ends: 142 [2020-08-18 18:00:58,442 INFO L226 Difference]: Without dead ends: 77 [2020-08-18 18:00:58,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 18:00:58,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-18 18:00:58,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-18 18:00:58,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-18 18:00:58,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-18 18:00:58,448 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-18 18:00:58,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:58,448 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-18 18:00:58,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 18:00:58,449 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-18 18:00:58,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-18 18:00:58,449 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:58,449 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:58,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 18:00:58,450 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:58,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:58,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-18 18:00:58,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:58,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [624949212] [2020-08-18 18:00:58,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:58,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:59,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:59,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:59,502 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:00:59,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [624949212] [2020-08-18 18:00:59,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:59,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 18:00:59,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493443934] [2020-08-18 18:00:59,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 18:00:59,505 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:59,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 18:00:59,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 18:00:59,505 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-18 18:01:01,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:01,043 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-18 18:01:01,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 18:01:01,043 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-18 18:01:01,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:01,044 INFO L225 Difference]: With dead ends: 146 [2020-08-18 18:01:01,044 INFO L226 Difference]: Without dead ends: 79 [2020-08-18 18:01:01,045 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 [2020-08-18 18:01:01,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-18 18:01:01,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-18 18:01:01,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 18:01:01,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-18 18:01:01,052 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-18 18:01:01,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:01,052 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-18 18:01:01,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 18:01:01,052 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-18 18:01:01,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 18:01:01,053 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:01,053 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:01,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 18:01:01,054 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:01,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:01,054 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-18 18:01:01,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:01,054 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1868963989] [2020-08-18 18:01:01,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:01,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:02,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:02,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:02,065 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:01:02,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1868963989] [2020-08-18 18:01:02,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:02,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 18:01:02,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544230797] [2020-08-18 18:01:02,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 18:01:02,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:02,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 18:01:02,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 18:01:02,068 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-18 18:01:03,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:03,735 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-18 18:01:03,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 18:01:03,737 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-18 18:01:03,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:03,737 INFO L225 Difference]: With dead ends: 150 [2020-08-18 18:01:03,738 INFO L226 Difference]: Without dead ends: 81 [2020-08-18 18:01:03,738 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 [2020-08-18 18:01:03,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-18 18:01:03,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-18 18:01:03,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-18 18:01:03,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-18 18:01:03,743 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-18 18:01:03,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:03,744 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-18 18:01:03,744 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 18:01:03,744 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-18 18:01:03,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-18 18:01:03,744 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:03,744 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:03,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 18:01:03,745 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:03,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:03,745 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-18 18:01:03,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:03,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653095957] [2020-08-18 18:01:03,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:03,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:04,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:04,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:04,756 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:01:04,756 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653095957] [2020-08-18 18:01:04,756 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:04,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 18:01:04,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135818004] [2020-08-18 18:01:04,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 18:01:04,757 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:04,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 18:01:04,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 18:01:04,758 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-18 18:01:06,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:06,533 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-18 18:01:06,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 18:01:06,537 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-18 18:01:06,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:06,538 INFO L225 Difference]: With dead ends: 154 [2020-08-18 18:01:06,538 INFO L226 Difference]: Without dead ends: 83 [2020-08-18 18:01:06,539 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 [2020-08-18 18:01:06,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-18 18:01:06,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-18 18:01:06,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-18 18:01:06,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-18 18:01:06,545 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-18 18:01:06,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:06,545 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-18 18:01:06,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 18:01:06,546 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-18 18:01:06,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-18 18:01:06,546 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:06,547 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:06,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 18:01:06,547 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:06,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:06,547 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-18 18:01:06,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:06,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [858828550] [2020-08-18 18:01:06,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:06,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:07,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:07,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:07,618 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:01:07,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [858828550] [2020-08-18 18:01:07,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:07,619 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 18:01:07,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867146015] [2020-08-18 18:01:07,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 18:01:07,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:07,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 18:01:07,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 18:01:07,621 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-18 18:01:09,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:09,462 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-18 18:01:09,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 18:01:09,462 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-18 18:01:09,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:09,463 INFO L225 Difference]: With dead ends: 158 [2020-08-18 18:01:09,463 INFO L226 Difference]: Without dead ends: 85 [2020-08-18 18:01:09,464 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 [2020-08-18 18:01:09,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-18 18:01:09,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-18 18:01:09,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 18:01:09,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-18 18:01:09,470 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-18 18:01:09,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:09,470 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-18 18:01:09,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 18:01:09,471 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-18 18:01:09,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 18:01:09,471 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:09,472 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:09,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 18:01:09,472 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:09,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:09,472 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-18 18:01:09,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:09,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1756998813] [2020-08-18 18:01:09,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:09,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:10,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:10,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:10,571 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:01:10,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1756998813] [2020-08-18 18:01:10,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:10,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 18:01:10,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802812713] [2020-08-18 18:01:10,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 18:01:10,572 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:10,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 18:01:10,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 18:01:10,573 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-18 18:01:12,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:12,458 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-18 18:01:12,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 18:01:12,465 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-18 18:01:12,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:12,466 INFO L225 Difference]: With dead ends: 162 [2020-08-18 18:01:12,466 INFO L226 Difference]: Without dead ends: 87 [2020-08-18 18:01:12,467 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 [2020-08-18 18:01:12,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-18 18:01:12,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-18 18:01:12,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-18 18:01:12,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-18 18:01:12,476 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-18 18:01:12,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:12,477 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-18 18:01:12,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 18:01:12,477 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-18 18:01:12,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-18 18:01:12,478 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:12,478 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:12,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 18:01:12,478 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:12,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:12,479 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-18 18:01:12,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:12,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [881442526] [2020-08-18 18:01:12,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:12,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:13,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:13,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:13,802 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:01:13,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [881442526] [2020-08-18 18:01:13,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:13,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 18:01:13,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374927307] [2020-08-18 18:01:13,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 18:01:13,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:13,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 18:01:13,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 18:01:13,805 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-18 18:01:15,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:15,890 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-18 18:01:15,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 18:01:15,891 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-18 18:01:15,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:15,892 INFO L225 Difference]: With dead ends: 166 [2020-08-18 18:01:15,892 INFO L226 Difference]: Without dead ends: 89 [2020-08-18 18:01:15,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 18:01:15,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-18 18:01:15,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-18 18:01:15,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-18 18:01:15,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-18 18:01:15,899 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-18 18:01:15,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:15,899 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-18 18:01:15,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 18:01:15,899 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-18 18:01:15,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-18 18:01:15,900 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:15,900 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:15,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 18:01:15,900 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:15,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:15,901 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-18 18:01:15,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:15,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [604948309] [2020-08-18 18:01:15,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:15,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:17,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:17,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:17,123 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:01:17,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [604948309] [2020-08-18 18:01:17,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:17,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 18:01:17,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333613129] [2020-08-18 18:01:17,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 18:01:17,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:17,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 18:01:17,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 18:01:17,125 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-18 18:01:19,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:19,249 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-18 18:01:19,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 18:01:19,250 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-18 18:01:19,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:19,251 INFO L225 Difference]: With dead ends: 170 [2020-08-18 18:01:19,252 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 18:01:19,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 18:01:19,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 18:01:19,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-18 18:01:19,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 18:01:19,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-18 18:01:19,259 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-18 18:01:19,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:19,259 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-18 18:01:19,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 18:01:19,259 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-18 18:01:19,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 18:01:19,260 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:19,260 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:19,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 18:01:19,261 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:19,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:19,261 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-18 18:01:19,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:19,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602230442] [2020-08-18 18:01:19,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:19,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:20,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:20,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:20,585 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:01:20,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602230442] [2020-08-18 18:01:20,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:20,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 18:01:20,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773432069] [2020-08-18 18:01:20,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 18:01:20,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:20,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 18:01:20,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 18:01:20,587 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-18 18:01:22,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:22,862 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-18 18:01:22,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 18:01:22,864 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-18 18:01:22,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:22,865 INFO L225 Difference]: With dead ends: 174 [2020-08-18 18:01:22,865 INFO L226 Difference]: Without dead ends: 93 [2020-08-18 18:01:22,866 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 18:01:22,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-18 18:01:22,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-18 18:01:22,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-18 18:01:22,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-18 18:01:22,883 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-18 18:01:22,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:22,883 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-18 18:01:22,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 18:01:22,883 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-18 18:01:22,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-18 18:01:22,887 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:22,887 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:22,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 18:01:22,888 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:22,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:22,888 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-18 18:01:22,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:22,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1191441483] [2020-08-18 18:01:22,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:22,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:24,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:24,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:24,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:01:24,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1191441483] [2020-08-18 18:01:24,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:24,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 18:01:24,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449044334] [2020-08-18 18:01:24,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 18:01:24,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:24,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 18:01:24,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 18:01:24,360 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states. [2020-08-18 18:01:26,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:26,677 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2020-08-18 18:01:26,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 18:01:26,677 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 89 [2020-08-18 18:01:26,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:26,678 INFO L225 Difference]: With dead ends: 178 [2020-08-18 18:01:26,679 INFO L226 Difference]: Without dead ends: 95 [2020-08-18 18:01:26,680 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=121, Invalid=1601, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 18:01:26,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-18 18:01:26,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2020-08-18 18:01:26,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-08-18 18:01:26,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2020-08-18 18:01:26,686 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 89 [2020-08-18 18:01:26,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:26,686 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2020-08-18 18:01:26,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 18:01:26,686 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2020-08-18 18:01:26,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-18 18:01:26,687 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:26,687 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:26,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 18:01:26,688 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:26,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:26,688 INFO L82 PathProgramCache]: Analyzing trace with hash 477506189, now seen corresponding path program 38 times [2020-08-18 18:01:26,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:26,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638104126] [2020-08-18 18:01:26,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:26,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat