/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.3 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 04:46:46,676 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 04:46:46,679 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 04:46:46,722 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 04:46:46,723 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 04:46:46,734 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 04:46:46,736 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 04:46:46,738 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 04:46:46,741 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 04:46:46,742 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 04:46:46,744 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 04:46:46,746 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 04:46:46,747 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 04:46:46,749 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 04:46:46,750 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 04:46:46,752 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 04:46:46,753 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 04:46:46,755 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 04:46:46,757 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 04:46:46,761 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 04:46:46,762 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 04:46:46,766 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 04:46:46,767 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 04:46:46,768 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 04:46:46,773 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 04:46:46,773 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 04:46:46,773 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 04:46:46,776 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 04:46:46,776 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 04:46:46,777 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-22 04:46:46,777 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-22 04:46:46,778 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-22 04:46:46,778 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-22 04:46:46,779 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-22 04:46:46,781 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-22 04:46:46,781 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-22 04:46:46,782 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-22 04:46:46,782 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-22 04:46:46,782 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 04:46:46,783 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 04:46:46,784 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 04:46:46,785 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-22 04:46:46,832 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 04:46:46,832 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 04:46:46,834 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 04:46:46,834 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 04:46:46,834 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 04:46:46,834 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 04:46:46,834 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 04:46:46,835 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 04:46:46,835 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 04:46:46,835 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 04:46:46,836 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 04:46:46,836 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 04:46:46,836 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 04:46:46,837 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 04:46:46,837 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 04:46:46,837 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 04:46:46,837 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 04:46:46,838 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 04:46:46,838 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 04:46:46,838 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 04:46:46,838 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 04:46:46,838 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 04:46:46,839 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 04:46:46,839 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 04:46:46,839 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 04:46:46,839 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 04:46:46,839 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 04:46:46,840 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 04:46:46,840 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 04:46:46,840 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; [2020-08-22 04:46:47,121 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 04:46:47,133 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 04:46:47,136 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 04:46:47,138 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 04:46:47,138 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 04:46:47,139 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-22 04:46:47,201 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7a1adfc36/45a8568d73284644a86f4065cc43d6cf/FLAGea2afe7a3 [2020-08-22 04:46:47,626 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 04:46:47,626 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-22 04:46:47,632 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7a1adfc36/45a8568d73284644a86f4065cc43d6cf/FLAGea2afe7a3 [2020-08-22 04:46:47,973 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7a1adfc36/45a8568d73284644a86f4065cc43d6cf [2020-08-22 04:46:47,983 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 04:46:47,985 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 04:46:47,985 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 04:46:47,986 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 04:46:47,989 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 04:46:47,990 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:46:47" (1/1) ... [2020-08-22 04:46:47,993 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1333f6e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:47, skipping insertion in model container [2020-08-22 04:46:47,993 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:46:47" (1/1) ... [2020-08-22 04:46:47,999 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 04:46:48,013 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 04:46:48,171 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 04:46:48,247 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 04:46:48,267 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 04:46:48,404 INFO L208 MainTranslator]: Completed translation [2020-08-22 04:46:48,404 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:48 WrapperNode [2020-08-22 04:46:48,405 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 04:46:48,405 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 04:46:48,405 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 04:46:48,406 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 04:46:48,415 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:48" (1/1) ... [2020-08-22 04:46:48,415 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:48" (1/1) ... [2020-08-22 04:46:48,423 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:48" (1/1) ... [2020-08-22 04:46:48,423 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:48" (1/1) ... [2020-08-22 04:46:48,431 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:48" (1/1) ... [2020-08-22 04:46:48,435 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:48" (1/1) ... [2020-08-22 04:46:48,437 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:48" (1/1) ... [2020-08-22 04:46:48,439 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 04:46:48,439 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 04:46:48,440 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 04:46:48,440 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 04:46:48,441 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:48" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 04:46:48,502 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 04:46:48,503 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 04:46:48,503 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 04:46:48,503 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 04:46:48,503 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 04:46:48,503 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 04:46:48,504 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 04:46:48,504 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 04:46:48,504 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 04:46:48,504 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-22 04:46:48,504 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 04:46:48,505 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 04:46:48,736 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 04:46:48,736 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-22 04:46:48,740 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:46:48 BoogieIcfgContainer [2020-08-22 04:46:48,741 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 04:46:48,742 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 04:46:48,742 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 04:46:48,745 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 04:46:48,745 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 04:46:47" (1/3) ... [2020-08-22 04:46:48,746 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@453245a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:46:48, skipping insertion in model container [2020-08-22 04:46:48,746 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:48" (2/3) ... [2020-08-22 04:46:48,746 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@453245a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:46:48, skipping insertion in model container [2020-08-22 04:46:48,747 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:46:48" (3/3) ... [2020-08-22 04:46:48,748 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-22 04:46:48,760 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 04:46:48,768 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 04:46:48,785 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 04:46:48,812 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 04:46:48,812 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 04:46:48,812 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 04:46:48,813 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 04:46:48,813 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 04:46:48,813 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 04:46:48,813 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 04:46:48,813 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 04:46:48,841 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-22 04:46:48,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-22 04:46:48,854 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:48,855 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:48,855 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:48,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:48,863 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-22 04:46:48,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:48,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [827813847] [2020-08-22 04:46:48,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:48,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:49,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:49,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:49,069 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:49,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [827813847] [2020-08-22 04:46:49,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 04:46:49,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 04:46:49,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883096380] [2020-08-22 04:46:49,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 04:46:49,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:49,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 04:46:49,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 04:46:49,094 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-22 04:46:49,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:49,182 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-22 04:46:49,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 04:46:49,184 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-22 04:46:49,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:49,193 INFO L225 Difference]: With dead ends: 42 [2020-08-22 04:46:49,193 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 04:46:49,196 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 [2020-08-22 04:46:49,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 04:46:49,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-22 04:46:49,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 04:46:49,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-22 04:46:49,236 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-22 04:46:49,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:49,236 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-22 04:46:49,236 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 04:46:49,237 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-22 04:46:49,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-22 04:46:49,237 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:49,237 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:49,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 04:46:49,238 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:49,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:49,239 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-22 04:46:49,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:49,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [129392223] [2020-08-22 04:46:49,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:49,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:49,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:49,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:49,330 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:49,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [129392223] [2020-08-22 04:46:49,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 04:46:49,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 04:46:49,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797025739] [2020-08-22 04:46:49,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 04:46:49,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:49,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 04:46:49,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 04:46:49,337 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-22 04:46:49,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:49,458 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-22 04:46:49,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 04:46:49,459 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-22 04:46:49,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:49,460 INFO L225 Difference]: With dead ends: 36 [2020-08-22 04:46:49,460 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 04:46:49,461 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 [2020-08-22 04:46:49,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 04:46:49,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-22 04:46:49,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 04:46:49,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-22 04:46:49,468 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-22 04:46:49,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:49,468 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-22 04:46:49,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 04:46:49,469 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-22 04:46:49,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 04:46:49,469 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:49,470 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:49,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 04:46:49,470 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:49,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:49,470 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-22 04:46:49,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:49,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [466412718] [2020-08-22 04:46:49,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:49,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:49,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:49,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:49,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:49,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [466412718] [2020-08-22 04:46:49,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 04:46:49,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 04:46:49,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579447853] [2020-08-22 04:46:49,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 04:46:49,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:49,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 04:46:49,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 04:46:49,552 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-22 04:46:49,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:49,671 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-22 04:46:49,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 04:46:49,671 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-22 04:46:49,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:49,672 INFO L225 Difference]: With dead ends: 40 [2020-08-22 04:46:49,673 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 04:46:49,674 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 [2020-08-22 04:46:49,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 04:46:49,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-22 04:46:49,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 04:46:49,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-22 04:46:49,680 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-22 04:46:49,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:49,681 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-22 04:46:49,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 04:46:49,681 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-22 04:46:49,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 04:46:49,682 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:49,682 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:49,682 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 04:46:49,682 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:49,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:49,683 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-22 04:46:49,683 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:49,684 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018480205] [2020-08-22 04:46:49,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:49,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:49,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:49,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:49,766 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:49,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018480205] [2020-08-22 04:46:49,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 04:46:49,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 04:46:49,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175647343] [2020-08-22 04:46:49,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 04:46:49,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:49,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 04:46:49,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 04:46:49,769 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-22 04:46:49,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:49,835 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-22 04:46:49,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 04:46:49,836 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-22 04:46:49,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:49,837 INFO L225 Difference]: With dead ends: 31 [2020-08-22 04:46:49,837 INFO L226 Difference]: Without dead ends: 21 [2020-08-22 04:46:49,838 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 [2020-08-22 04:46:49,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-22 04:46:49,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-22 04:46:49,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-22 04:46:49,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-22 04:46:49,844 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-22 04:46:49,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:49,844 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-22 04:46:49,844 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 04:46:49,844 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-22 04:46:49,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 04:46:49,845 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:49,845 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:49,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 04:46:49,846 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:49,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:49,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-22 04:46:49,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:49,847 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [640615370] [2020-08-22 04:46:49,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:49,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:49,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:49,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:49,959 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:49,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [640615370] [2020-08-22 04:46:49,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:49,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-22 04:46:49,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636861496] [2020-08-22 04:46:49,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 04:46:49,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:49,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 04:46:49,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-22 04:46:49,962 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-22 04:46:50,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:50,038 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-22 04:46:50,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 04:46:50,039 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-22 04:46:50,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:50,040 INFO L225 Difference]: With dead ends: 34 [2020-08-22 04:46:50,040 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 04:46:50,041 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 [2020-08-22 04:46:50,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 04:46:50,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-22 04:46:50,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 04:46:50,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-22 04:46:50,046 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-22 04:46:50,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:50,047 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-22 04:46:50,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 04:46:50,047 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-22 04:46:50,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 04:46:50,048 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:50,048 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:50,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 04:46:50,049 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:50,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:50,049 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-22 04:46:50,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:50,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1138361797] [2020-08-22 04:46:50,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:50,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:50,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:50,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:50,198 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:50,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1138361797] [2020-08-22 04:46:50,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:50,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 04:46:50,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391392309] [2020-08-22 04:46:50,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 04:46:50,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:50,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 04:46:50,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 04:46:50,201 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-22 04:46:50,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:50,279 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-22 04:46:50,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 04:46:50,280 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-22 04:46:50,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:50,281 INFO L225 Difference]: With dead ends: 38 [2020-08-22 04:46:50,281 INFO L226 Difference]: Without dead ends: 25 [2020-08-22 04:46:50,282 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 [2020-08-22 04:46:50,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-22 04:46:50,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-22 04:46:50,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-22 04:46:50,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-22 04:46:50,287 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-22 04:46:50,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:50,288 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-22 04:46:50,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 04:46:50,288 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-22 04:46:50,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 04:46:50,289 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:50,289 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:50,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 04:46:50,289 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:50,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:50,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-22 04:46:50,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:50,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105633509] [2020-08-22 04:46:50,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:50,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:50,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:50,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:50,414 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:50,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105633509] [2020-08-22 04:46:50,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:50,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 04:46:50,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097349818] [2020-08-22 04:46:50,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 04:46:50,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:50,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 04:46:50,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-22 04:46:50,417 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-22 04:46:50,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:50,526 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-22 04:46:50,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 04:46:50,526 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-22 04:46:50,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:50,527 INFO L225 Difference]: With dead ends: 42 [2020-08-22 04:46:50,527 INFO L226 Difference]: Without dead ends: 27 [2020-08-22 04:46:50,528 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 [2020-08-22 04:46:50,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-22 04:46:50,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-22 04:46:50,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-22 04:46:50,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-22 04:46:50,534 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-22 04:46:50,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:50,534 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-22 04:46:50,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 04:46:50,534 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-22 04:46:50,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-22 04:46:50,535 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:50,535 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:50,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 04:46:50,536 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:50,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:50,536 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-22 04:46:50,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:50,537 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1942211010] [2020-08-22 04:46:50,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:50,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:50,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:50,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:50,662 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:50,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1942211010] [2020-08-22 04:46:50,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:50,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 04:46:50,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927998798] [2020-08-22 04:46:50,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 04:46:50,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:50,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 04:46:50,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 04:46:50,664 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-22 04:46:50,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:50,774 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-22 04:46:50,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 04:46:50,774 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-22 04:46:50,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:50,776 INFO L225 Difference]: With dead ends: 46 [2020-08-22 04:46:50,776 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 04:46:50,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-22 04:46:50,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 04:46:50,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-22 04:46:50,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 04:46:50,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-22 04:46:50,782 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-22 04:46:50,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:50,782 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-22 04:46:50,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 04:46:50,782 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-22 04:46:50,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 04:46:50,783 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:50,783 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:50,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 04:46:50,784 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:50,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:50,784 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-22 04:46:50,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:50,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1463067178] [2020-08-22 04:46:50,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:50,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:50,913 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:50,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:50,918 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:50,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1463067178] [2020-08-22 04:46:50,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:50,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 04:46:50,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088542768] [2020-08-22 04:46:50,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 04:46:50,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:50,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 04:46:50,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-22 04:46:50,920 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-22 04:46:51,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:51,051 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-22 04:46:51,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 04:46:51,051 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-22 04:46:51,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:51,052 INFO L225 Difference]: With dead ends: 50 [2020-08-22 04:46:51,052 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 04:46:51,053 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 [2020-08-22 04:46:51,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 04:46:51,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-22 04:46:51,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 04:46:51,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-22 04:46:51,058 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-22 04:46:51,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:51,059 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-22 04:46:51,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 04:46:51,059 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-22 04:46:51,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 04:46:51,060 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:51,060 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:51,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 04:46:51,061 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:51,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:51,061 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-22 04:46:51,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:51,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944224141] [2020-08-22 04:46:51,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:51,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:51,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:51,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:51,242 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:51,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944224141] [2020-08-22 04:46:51,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:51,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 04:46:51,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225051823] [2020-08-22 04:46:51,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 04:46:51,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:51,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 04:46:51,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-22 04:46:51,245 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-22 04:46:51,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:51,430 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-22 04:46:51,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 04:46:51,430 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-22 04:46:51,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:51,431 INFO L225 Difference]: With dead ends: 54 [2020-08-22 04:46:51,431 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 04:46:51,432 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 [2020-08-22 04:46:51,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 04:46:51,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-22 04:46:51,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 04:46:51,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-22 04:46:51,438 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-22 04:46:51,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:51,438 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-22 04:46:51,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 04:46:51,438 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-22 04:46:51,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 04:46:51,439 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:51,439 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:51,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 04:46:51,440 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:51,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:51,440 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-22 04:46:51,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:51,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [683828967] [2020-08-22 04:46:51,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:51,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:51,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:51,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:51,607 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:51,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [683828967] [2020-08-22 04:46:51,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:51,608 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 04:46:51,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658406168] [2020-08-22 04:46:51,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 04:46:51,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:51,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 04:46:51,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-22 04:46:51,610 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-22 04:46:51,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:51,798 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-22 04:46:51,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 04:46:51,798 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-22 04:46:51,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:51,799 INFO L225 Difference]: With dead ends: 58 [2020-08-22 04:46:51,799 INFO L226 Difference]: Without dead ends: 35 [2020-08-22 04:46:51,800 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 [2020-08-22 04:46:51,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-22 04:46:51,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-22 04:46:51,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 04:46:51,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-22 04:46:51,805 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-22 04:46:51,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:51,805 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-22 04:46:51,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 04:46:51,805 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-22 04:46:51,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 04:46:51,806 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:51,806 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:51,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 04:46:51,807 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:51,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:51,807 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-22 04:46:51,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:51,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2004226375] [2020-08-22 04:46:51,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:51,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:51,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:51,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:51,991 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:51,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2004226375] [2020-08-22 04:46:51,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:51,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 04:46:51,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083109278] [2020-08-22 04:46:51,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 04:46:51,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:51,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 04:46:51,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-22 04:46:51,993 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-22 04:46:52,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:52,217 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-22 04:46:52,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 04:46:52,217 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-22 04:46:52,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:52,218 INFO L225 Difference]: With dead ends: 62 [2020-08-22 04:46:52,218 INFO L226 Difference]: Without dead ends: 37 [2020-08-22 04:46:52,219 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 [2020-08-22 04:46:52,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-22 04:46:52,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-22 04:46:52,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 04:46:52,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-22 04:46:52,227 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-22 04:46:52,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:52,227 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-22 04:46:52,228 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 04:46:52,228 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-22 04:46:52,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 04:46:52,231 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:52,232 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:52,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 04:46:52,233 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:52,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:52,234 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-22 04:46:52,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:52,234 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1383202350] [2020-08-22 04:46:52,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:52,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:52,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:52,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:52,489 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:52,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1383202350] [2020-08-22 04:46:52,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:52,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 04:46:52,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883838107] [2020-08-22 04:46:52,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 04:46:52,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:52,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 04:46:52,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-22 04:46:52,491 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-22 04:46:52,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:52,759 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-22 04:46:52,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 04:46:52,759 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-22 04:46:52,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:52,760 INFO L225 Difference]: With dead ends: 66 [2020-08-22 04:46:52,760 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 04:46:52,761 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 [2020-08-22 04:46:52,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 04:46:52,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-22 04:46:52,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-22 04:46:52,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-22 04:46:52,770 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-22 04:46:52,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:52,774 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-22 04:46:52,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 04:46:52,774 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-22 04:46:52,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-22 04:46:52,775 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:52,775 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:52,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 04:46:52,775 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:52,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:52,776 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-22 04:46:52,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:52,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474416400] [2020-08-22 04:46:52,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:52,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:53,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:53,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:53,053 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:53,054 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474416400] [2020-08-22 04:46:53,054 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:53,054 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 04:46:53,054 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101094943] [2020-08-22 04:46:53,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 04:46:53,055 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:53,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 04:46:53,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-22 04:46:53,056 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-22 04:46:53,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:53,332 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-22 04:46:53,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 04:46:53,332 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-22 04:46:53,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:53,333 INFO L225 Difference]: With dead ends: 70 [2020-08-22 04:46:53,333 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 04:46:53,334 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 [2020-08-22 04:46:53,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 04:46:53,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-22 04:46:53,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 04:46:53,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-22 04:46:53,340 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-22 04:46:53,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:53,340 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-22 04:46:53,340 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 04:46:53,340 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-22 04:46:53,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 04:46:53,341 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:53,341 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:53,341 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 04:46:53,342 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:53,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:53,342 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-22 04:46:53,342 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:53,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1983938025] [2020-08-22 04:46:53,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:53,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:53,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:53,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:53,571 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:53,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1983938025] [2020-08-22 04:46:53,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:53,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 04:46:53,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829616] [2020-08-22 04:46:53,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 04:46:53,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:53,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 04:46:53,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-22 04:46:53,573 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-22 04:46:53,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:53,916 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-22 04:46:53,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 04:46:53,916 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-22 04:46:53,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:53,917 INFO L225 Difference]: With dead ends: 74 [2020-08-22 04:46:53,917 INFO L226 Difference]: Without dead ends: 43 [2020-08-22 04:46:53,918 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 [2020-08-22 04:46:53,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-22 04:46:53,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-22 04:46:53,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-22 04:46:53,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-22 04:46:53,924 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-22 04:46:53,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:53,925 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-22 04:46:53,925 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 04:46:53,925 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-22 04:46:53,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-22 04:46:53,926 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:53,926 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:53,926 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 04:46:53,926 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:53,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:53,927 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-22 04:46:53,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:53,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1356590250] [2020-08-22 04:46:53,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:53,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:54,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:54,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:54,236 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:54,236 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1356590250] [2020-08-22 04:46:54,236 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:54,236 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 04:46:54,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692365550] [2020-08-22 04:46:54,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 04:46:54,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:54,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 04:46:54,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-22 04:46:54,238 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-22 04:46:54,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:54,639 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-22 04:46:54,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 04:46:54,639 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-22 04:46:54,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:54,640 INFO L225 Difference]: With dead ends: 78 [2020-08-22 04:46:54,640 INFO L226 Difference]: Without dead ends: 45 [2020-08-22 04:46:54,641 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 [2020-08-22 04:46:54,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-22 04:46:54,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-22 04:46:54,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 04:46:54,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-22 04:46:54,646 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-22 04:46:54,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:54,647 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-22 04:46:54,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 04:46:54,647 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-22 04:46:54,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 04:46:54,647 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:54,647 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:54,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 04:46:54,648 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:54,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:54,648 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-22 04:46:54,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:54,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [530871278] [2020-08-22 04:46:54,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:54,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:54,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:54,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:54,939 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:54,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [530871278] [2020-08-22 04:46:54,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:54,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 04:46:54,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444363533] [2020-08-22 04:46:54,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 04:46:54,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:54,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 04:46:54,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-22 04:46:54,943 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-22 04:46:55,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:55,347 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-22 04:46:55,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 04:46:55,347 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-22 04:46:55,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:55,348 INFO L225 Difference]: With dead ends: 82 [2020-08-22 04:46:55,348 INFO L226 Difference]: Without dead ends: 47 [2020-08-22 04:46:55,349 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 [2020-08-22 04:46:55,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-22 04:46:55,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-22 04:46:55,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 04:46:55,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-22 04:46:55,355 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-22 04:46:55,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:55,355 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-22 04:46:55,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 04:46:55,356 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-22 04:46:55,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 04:46:55,356 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:55,356 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:55,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-22 04:46:55,357 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:55,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:55,357 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-22 04:46:55,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:55,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [983668423] [2020-08-22 04:46:55,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:55,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:55,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:55,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:55,662 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:55,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [983668423] [2020-08-22 04:46:55,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:55,662 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 04:46:55,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58858759] [2020-08-22 04:46:55,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 04:46:55,663 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:55,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 04:46:55,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-22 04:46:55,664 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-22 04:46:56,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:56,137 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-22 04:46:56,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 04:46:56,138 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-22 04:46:56,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:56,138 INFO L225 Difference]: With dead ends: 86 [2020-08-22 04:46:56,139 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 04:46:56,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-22 04:46:56,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 04:46:56,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-22 04:46:56,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 04:46:56,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-22 04:46:56,149 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-22 04:46:56,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:56,153 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-22 04:46:56,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 04:46:56,153 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-22 04:46:56,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-22 04:46:56,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:56,153 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:56,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-22 04:46:56,154 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:56,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:56,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-22 04:46:56,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:56,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [549293788] [2020-08-22 04:46:56,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:56,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:56,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:56,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:56,533 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:56,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [549293788] [2020-08-22 04:46:56,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:56,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 04:46:56,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867586054] [2020-08-22 04:46:56,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 04:46:56,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:56,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 04:46:56,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-22 04:46:56,535 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-22 04:46:57,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:57,023 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-22 04:46:57,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 04:46:57,024 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-22 04:46:57,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:57,025 INFO L225 Difference]: With dead ends: 90 [2020-08-22 04:46:57,025 INFO L226 Difference]: Without dead ends: 51 [2020-08-22 04:46:57,026 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-22 04:46:57,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-22 04:46:57,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-22 04:46:57,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-22 04:46:57,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-22 04:46:57,033 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-22 04:46:57,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:57,035 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-22 04:46:57,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 04:46:57,035 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-22 04:46:57,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-22 04:46:57,036 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:57,036 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:57,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-22 04:46:57,037 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:57,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:57,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-22 04:46:57,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:57,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [570471311] [2020-08-22 04:46:57,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:57,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:57,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:57,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:57,385 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:57,386 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [570471311] [2020-08-22 04:46:57,386 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:57,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 04:46:57,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582713844] [2020-08-22 04:46:57,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 04:46:57,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:57,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 04:46:57,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-22 04:46:57,388 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-22 04:46:58,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:58,000 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-22 04:46:58,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 04:46:58,000 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-22 04:46:58,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:58,001 INFO L225 Difference]: With dead ends: 94 [2020-08-22 04:46:58,001 INFO L226 Difference]: Without dead ends: 53 [2020-08-22 04:46:58,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-22 04:46:58,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-22 04:46:58,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-22 04:46:58,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-22 04:46:58,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-22 04:46:58,007 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-22 04:46:58,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:58,007 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-22 04:46:58,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 04:46:58,007 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-22 04:46:58,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-22 04:46:58,008 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:58,008 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:58,008 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-22 04:46:58,008 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:58,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:58,009 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-22 04:46:58,009 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:58,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [830560411] [2020-08-22 04:46:58,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:58,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:58,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:58,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:58,433 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:58,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [830560411] [2020-08-22 04:46:58,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:58,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 04:46:58,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557664051] [2020-08-22 04:46:58,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 04:46:58,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:58,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 04:46:58,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-22 04:46:58,436 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-22 04:46:59,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:46:59,036 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-22 04:46:59,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 04:46:59,036 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-22 04:46:59,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:46:59,037 INFO L225 Difference]: With dead ends: 98 [2020-08-22 04:46:59,037 INFO L226 Difference]: Without dead ends: 55 [2020-08-22 04:46:59,038 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 [2020-08-22 04:46:59,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-22 04:46:59,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-22 04:46:59,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-22 04:46:59,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-22 04:46:59,043 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-22 04:46:59,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:46:59,043 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-22 04:46:59,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 04:46:59,043 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-22 04:46:59,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-22 04:46:59,044 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:46:59,044 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:46:59,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-22 04:46:59,044 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:46:59,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:46:59,045 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-22 04:46:59,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:46:59,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409815015] [2020-08-22 04:46:59,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:46:59,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:59,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:46:59,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:46:59,459 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:46:59,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409815015] [2020-08-22 04:46:59,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:46:59,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 04:46:59,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276882849] [2020-08-22 04:46:59,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 04:46:59,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:46:59,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 04:46:59,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-22 04:46:59,462 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-22 04:47:00,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:00,221 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-22 04:47:00,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 04:47:00,225 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-22 04:47:00,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:00,226 INFO L225 Difference]: With dead ends: 102 [2020-08-22 04:47:00,226 INFO L226 Difference]: Without dead ends: 57 [2020-08-22 04:47:00,227 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 [2020-08-22 04:47:00,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-22 04:47:00,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-22 04:47:00,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-22 04:47:00,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-22 04:47:00,231 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-22 04:47:00,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:00,232 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-22 04:47:00,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 04:47:00,232 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-22 04:47:00,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-22 04:47:00,232 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:00,233 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:00,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 04:47:00,233 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:00,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:00,233 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-22 04:47:00,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:00,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [93908006] [2020-08-22 04:47:00,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:00,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:00,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:00,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:00,674 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:00,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [93908006] [2020-08-22 04:47:00,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:00,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 04:47:00,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893719766] [2020-08-22 04:47:00,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 04:47:00,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:00,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 04:47:00,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-22 04:47:00,680 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-22 04:47:01,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:01,393 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-22 04:47:01,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-22 04:47:01,399 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-22 04:47:01,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:01,400 INFO L225 Difference]: With dead ends: 106 [2020-08-22 04:47:01,400 INFO L226 Difference]: Without dead ends: 59 [2020-08-22 04:47:01,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-22 04:47:01,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-22 04:47:01,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-22 04:47:01,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-22 04:47:01,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-22 04:47:01,405 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-22 04:47:01,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:01,406 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-22 04:47:01,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 04:47:01,406 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-22 04:47:01,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-22 04:47:01,406 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:01,407 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:01,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-22 04:47:01,407 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:01,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:01,407 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-22 04:47:01,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:01,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [183759560] [2020-08-22 04:47:01,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:01,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:01,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:01,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:01,893 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:01,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [183759560] [2020-08-22 04:47:01,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:01,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-22 04:47:01,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524566774] [2020-08-22 04:47:01,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 04:47:01,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:01,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 04:47:01,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-22 04:47:01,895 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-22 04:47:02,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:02,666 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-22 04:47:02,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 04:47:02,672 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-22 04:47:02,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:02,672 INFO L225 Difference]: With dead ends: 110 [2020-08-22 04:47:02,672 INFO L226 Difference]: Without dead ends: 61 [2020-08-22 04:47:02,673 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 [2020-08-22 04:47:02,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-22 04:47:02,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-22 04:47:02,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-22 04:47:02,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-22 04:47:02,678 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-22 04:47:02,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:02,678 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-22 04:47:02,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 04:47:02,678 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-22 04:47:02,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-22 04:47:02,679 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:02,679 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:02,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-22 04:47:02,679 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:02,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:02,680 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-22 04:47:02,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:02,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1408076171] [2020-08-22 04:47:02,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:02,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:03,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:03,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:03,238 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:03,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1408076171] [2020-08-22 04:47:03,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:03,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 04:47:03,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942290939] [2020-08-22 04:47:03,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 04:47:03,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:03,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 04:47:03,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-22 04:47:03,240 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-22 04:47:04,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:04,022 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-22 04:47:04,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-22 04:47:04,022 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-22 04:47:04,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:04,023 INFO L225 Difference]: With dead ends: 114 [2020-08-22 04:47:04,023 INFO L226 Difference]: Without dead ends: 63 [2020-08-22 04:47:04,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-08-22 04:47:04,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-22 04:47:04,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-22 04:47:04,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-22 04:47:04,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-22 04:47:04,028 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-22 04:47:04,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:04,028 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-22 04:47:04,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 04:47:04,028 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-22 04:47:04,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-22 04:47:04,029 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:04,029 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:04,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-22 04:47:04,029 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:04,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:04,029 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-22 04:47:04,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:04,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1386668969] [2020-08-22 04:47:04,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:04,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:04,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:04,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:04,597 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:04,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1386668969] [2020-08-22 04:47:04,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:04,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-22 04:47:04,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361638862] [2020-08-22 04:47:04,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-22 04:47:04,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:04,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-22 04:47:04,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-22 04:47:04,600 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-22 04:47:05,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:05,491 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-22 04:47:05,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-22 04:47:05,492 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-22 04:47:05,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:05,492 INFO L225 Difference]: With dead ends: 118 [2020-08-22 04:47:05,493 INFO L226 Difference]: Without dead ends: 65 [2020-08-22 04:47:05,493 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 [2020-08-22 04:47:05,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-22 04:47:05,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-22 04:47:05,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-22 04:47:05,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-22 04:47:05,499 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-22 04:47:05,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:05,499 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-22 04:47:05,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-22 04:47:05,499 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-22 04:47:05,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-22 04:47:05,500 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:05,500 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:05,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-22 04:47:05,502 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:05,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:05,503 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-22 04:47:05,503 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:05,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1454487145] [2020-08-22 04:47:05,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:05,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:06,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:06,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:06,086 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:06,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1454487145] [2020-08-22 04:47:06,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:06,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-22 04:47:06,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330522723] [2020-08-22 04:47:06,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-22 04:47:06,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:06,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-22 04:47:06,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-22 04:47:06,088 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-22 04:47:07,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:07,188 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-22 04:47:07,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-22 04:47:07,189 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-22 04:47:07,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:07,190 INFO L225 Difference]: With dead ends: 122 [2020-08-22 04:47:07,190 INFO L226 Difference]: Without dead ends: 67 [2020-08-22 04:47:07,191 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 [2020-08-22 04:47:07,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-22 04:47:07,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-22 04:47:07,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-22 04:47:07,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-22 04:47:07,196 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-22 04:47:07,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:07,197 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-22 04:47:07,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-22 04:47:07,197 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-22 04:47:07,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-22 04:47:07,197 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:07,198 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:07,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-22 04:47:07,198 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:07,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:07,198 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-22 04:47:07,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:07,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1225712386] [2020-08-22 04:47:07,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:07,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:07,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:07,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:07,863 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:07,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1225712386] [2020-08-22 04:47:07,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:07,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-22 04:47:07,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635388959] [2020-08-22 04:47:07,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-22 04:47:07,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:07,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-22 04:47:07,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-22 04:47:07,865 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-22 04:47:08,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:08,960 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-22 04:47:08,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-22 04:47:08,961 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-22 04:47:08,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:08,963 INFO L225 Difference]: With dead ends: 126 [2020-08-22 04:47:08,963 INFO L226 Difference]: Without dead ends: 69 [2020-08-22 04:47:08,964 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 [2020-08-22 04:47:08,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-22 04:47:08,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-22 04:47:08,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-22 04:47:08,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-22 04:47:08,969 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-22 04:47:08,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:08,969 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-22 04:47:08,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-22 04:47:08,969 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-22 04:47:08,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-22 04:47:08,970 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:08,970 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:08,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-22 04:47:08,970 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:08,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:08,971 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-22 04:47:08,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:08,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [635823782] [2020-08-22 04:47:08,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:09,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:09,618 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:09,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:09,627 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:09,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [635823782] [2020-08-22 04:47:09,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:09,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 04:47:09,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843354091] [2020-08-22 04:47:09,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 04:47:09,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:09,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 04:47:09,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-22 04:47:09,629 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-22 04:47:10,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:10,767 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-22 04:47:10,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-22 04:47:10,769 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-22 04:47:10,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:10,770 INFO L225 Difference]: With dead ends: 130 [2020-08-22 04:47:10,770 INFO L226 Difference]: Without dead ends: 71 [2020-08-22 04:47:10,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-22 04:47:10,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-22 04:47:10,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-22 04:47:10,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-22 04:47:10,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-22 04:47:10,776 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-22 04:47:10,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:10,776 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-22 04:47:10,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-22 04:47:10,776 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-22 04:47:10,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-22 04:47:10,777 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:10,777 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:10,777 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-22 04:47:10,777 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:10,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:10,778 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-22 04:47:10,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:10,778 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1788008346] [2020-08-22 04:47:10,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:10,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:11,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:11,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:11,620 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:11,621 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1788008346] [2020-08-22 04:47:11,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:11,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-22 04:47:11,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409626432] [2020-08-22 04:47:11,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-22 04:47:11,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:11,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-22 04:47:11,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-22 04:47:11,623 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-22 04:47:12,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:12,871 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-22 04:47:12,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-22 04:47:12,878 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-22 04:47:12,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:12,879 INFO L225 Difference]: With dead ends: 134 [2020-08-22 04:47:12,879 INFO L226 Difference]: Without dead ends: 73 [2020-08-22 04:47:12,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-22 04:47:12,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-22 04:47:12,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-22 04:47:12,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-22 04:47:12,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-22 04:47:12,886 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-22 04:47:12,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:12,888 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-22 04:47:12,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-22 04:47:12,888 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-22 04:47:12,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-22 04:47:12,889 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:12,889 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:12,889 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-22 04:47:12,889 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:12,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:12,890 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-22 04:47:12,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:12,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [902375753] [2020-08-22 04:47:12,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:12,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:13,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:13,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:13,968 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:13,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [902375753] [2020-08-22 04:47:13,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:13,969 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-22 04:47:13,969 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451454341] [2020-08-22 04:47:13,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-22 04:47:13,970 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:13,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-22 04:47:13,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-22 04:47:13,971 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-22 04:47:15,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:15,451 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-22 04:47:15,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-22 04:47:15,451 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-22 04:47:15,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:15,452 INFO L225 Difference]: With dead ends: 138 [2020-08-22 04:47:15,452 INFO L226 Difference]: Without dead ends: 75 [2020-08-22 04:47:15,453 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-22 04:47:15,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-22 04:47:15,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-22 04:47:15,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-22 04:47:15,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-22 04:47:15,458 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-22 04:47:15,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:15,459 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-22 04:47:15,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-22 04:47:15,459 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-22 04:47:15,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-22 04:47:15,459 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:15,460 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:15,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-22 04:47:15,460 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:15,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:15,460 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-22 04:47:15,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:15,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1623456299] [2020-08-22 04:47:15,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:15,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:16,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:16,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:16,335 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:16,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1623456299] [2020-08-22 04:47:16,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:16,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-22 04:47:16,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595641909] [2020-08-22 04:47:16,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-22 04:47:16,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:16,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-22 04:47:16,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-22 04:47:16,339 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-22 04:47:18,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:18,007 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-22 04:47:18,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-22 04:47:18,008 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-22 04:47:18,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:18,009 INFO L225 Difference]: With dead ends: 142 [2020-08-22 04:47:18,009 INFO L226 Difference]: Without dead ends: 77 [2020-08-22 04:47:18,010 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 [2020-08-22 04:47:18,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-22 04:47:18,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-22 04:47:18,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-22 04:47:18,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-22 04:47:18,017 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-22 04:47:18,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:18,017 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-22 04:47:18,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-22 04:47:18,018 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-22 04:47:18,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-22 04:47:18,021 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:18,021 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:18,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-22 04:47:18,021 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:18,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:18,022 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-22 04:47:18,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:18,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098214319] [2020-08-22 04:47:18,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:18,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:18,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:18,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:18,963 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:18,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1098214319] [2020-08-22 04:47:18,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:18,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-22 04:47:18,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459948298] [2020-08-22 04:47:18,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-22 04:47:18,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:18,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-22 04:47:18,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 04:47:18,966 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-22 04:47:20,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:20,458 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-22 04:47:20,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-22 04:47:20,463 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-22 04:47:20,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:20,464 INFO L225 Difference]: With dead ends: 146 [2020-08-22 04:47:20,464 INFO L226 Difference]: Without dead ends: 79 [2020-08-22 04:47:20,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 04:47:20,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-22 04:47:20,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-22 04:47:20,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-22 04:47:20,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-22 04:47:20,470 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-22 04:47:20,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:20,470 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-22 04:47:20,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-22 04:47:20,471 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-22 04:47:20,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-22 04:47:20,471 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:20,472 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:20,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-22 04:47:20,472 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:20,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:20,472 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-22 04:47:20,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:20,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1693913228] [2020-08-22 04:47:20,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:20,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:21,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:21,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:21,417 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:21,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1693913228] [2020-08-22 04:47:21,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:21,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-22 04:47:21,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095749005] [2020-08-22 04:47:21,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-22 04:47:21,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:21,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-22 04:47:21,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 04:47:21,425 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-22 04:47:23,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:23,001 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-22 04:47:23,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-22 04:47:23,002 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-22 04:47:23,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:23,003 INFO L225 Difference]: With dead ends: 150 [2020-08-22 04:47:23,003 INFO L226 Difference]: Without dead ends: 81 [2020-08-22 04:47:23,003 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 04:47:23,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-22 04:47:23,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-22 04:47:23,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-22 04:47:23,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-22 04:47:23,010 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-22 04:47:23,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:23,012 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-22 04:47:23,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-22 04:47:23,012 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-22 04:47:23,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-22 04:47:23,013 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:23,013 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:23,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-22 04:47:23,013 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:23,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:23,013 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-22 04:47:23,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:23,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [319673709] [2020-08-22 04:47:23,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:23,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:24,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:24,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:24,021 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:24,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [319673709] [2020-08-22 04:47:24,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:24,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-22 04:47:24,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511452664] [2020-08-22 04:47:24,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-22 04:47:24,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:24,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-22 04:47:24,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 04:47:24,023 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-22 04:47:25,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:25,707 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-22 04:47:25,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-22 04:47:25,708 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-22 04:47:25,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:25,709 INFO L225 Difference]: With dead ends: 154 [2020-08-22 04:47:25,709 INFO L226 Difference]: Without dead ends: 83 [2020-08-22 04:47:25,710 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 [2020-08-22 04:47:25,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-22 04:47:25,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-22 04:47:25,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-22 04:47:25,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-22 04:47:25,715 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-22 04:47:25,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:25,715 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-22 04:47:25,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-22 04:47:25,715 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-22 04:47:25,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-22 04:47:25,716 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:25,716 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:25,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-22 04:47:25,716 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:25,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:25,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-22 04:47:25,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:25,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1200846404] [2020-08-22 04:47:25,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:25,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:26,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:26,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:26,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:26,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1200846404] [2020-08-22 04:47:26,745 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:26,745 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-22 04:47:26,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775390013] [2020-08-22 04:47:26,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-22 04:47:26,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:26,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-22 04:47:26,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 04:47:26,747 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-22 04:47:28,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:28,540 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-22 04:47:28,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-22 04:47:28,541 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-22 04:47:28,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:28,542 INFO L225 Difference]: With dead ends: 158 [2020-08-22 04:47:28,542 INFO L226 Difference]: Without dead ends: 85 [2020-08-22 04:47:28,543 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 04:47:28,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-22 04:47:28,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-22 04:47:28,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-22 04:47:28,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-22 04:47:28,548 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-22 04:47:28,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:28,548 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-22 04:47:28,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-22 04:47:28,549 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-22 04:47:28,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-22 04:47:28,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:28,549 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:28,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-22 04:47:28,550 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:28,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:28,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-22 04:47:28,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:28,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077323839] [2020-08-22 04:47:28,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:28,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:29,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:29,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:29,679 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:29,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2077323839] [2020-08-22 04:47:29,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:29,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-22 04:47:29,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574627935] [2020-08-22 04:47:29,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-22 04:47:29,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:29,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-22 04:47:29,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 04:47:29,681 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-22 04:47:31,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:31,500 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-22 04:47:31,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-22 04:47:31,503 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-22 04:47:31,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:31,503 INFO L225 Difference]: With dead ends: 162 [2020-08-22 04:47:31,504 INFO L226 Difference]: Without dead ends: 87 [2020-08-22 04:47:31,504 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 [2020-08-22 04:47:31,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-22 04:47:31,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-22 04:47:31,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-22 04:47:31,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-22 04:47:31,510 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-22 04:47:31,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:31,510 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-22 04:47:31,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-22 04:47:31,511 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-22 04:47:31,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-22 04:47:31,511 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:31,511 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:31,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-22 04:47:31,512 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:31,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:31,512 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-22 04:47:31,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:31,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [486475063] [2020-08-22 04:47:31,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:31,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:32,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:32,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:32,717 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:32,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [486475063] [2020-08-22 04:47:32,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:32,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-22 04:47:32,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562451360] [2020-08-22 04:47:32,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-22 04:47:32,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:32,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-22 04:47:32,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 04:47:32,719 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-22 04:47:34,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:34,774 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-22 04:47:34,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-22 04:47:34,775 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-22 04:47:34,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:34,775 INFO L225 Difference]: With dead ends: 166 [2020-08-22 04:47:34,775 INFO L226 Difference]: Without dead ends: 89 [2020-08-22 04:47:34,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 04:47:34,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-22 04:47:34,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-22 04:47:34,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-22 04:47:34,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-22 04:47:34,780 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-22 04:47:34,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:34,781 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-22 04:47:34,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-22 04:47:34,781 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-22 04:47:34,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-22 04:47:34,782 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:34,782 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:34,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-22 04:47:34,782 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:34,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:34,782 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-22 04:47:34,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:34,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598814443] [2020-08-22 04:47:34,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:34,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:36,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:36,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:36,064 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:36,064 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598814443] [2020-08-22 04:47:36,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:36,065 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-22 04:47:36,065 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997625300] [2020-08-22 04:47:36,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-22 04:47:36,065 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:36,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-22 04:47:36,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 04:47:36,066 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-22 04:47:38,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:38,106 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-22 04:47:38,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-22 04:47:38,106 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-22 04:47:38,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:38,108 INFO L225 Difference]: With dead ends: 170 [2020-08-22 04:47:38,108 INFO L226 Difference]: Without dead ends: 91 [2020-08-22 04:47:38,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 04:47:38,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-22 04:47:38,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-22 04:47:38,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-22 04:47:38,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-22 04:47:38,115 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-22 04:47:38,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:38,115 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-22 04:47:38,115 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-22 04:47:38,115 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-22 04:47:38,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-22 04:47:38,116 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:38,116 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:38,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-22 04:47:38,116 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:38,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:38,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-22 04:47:38,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:38,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [742537920] [2020-08-22 04:47:38,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:38,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:39,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:39,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:39,406 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:39,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [742537920] [2020-08-22 04:47:39,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:39,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-22 04:47:39,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659310442] [2020-08-22 04:47:39,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-22 04:47:39,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:39,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-22 04:47:39,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 04:47:39,408 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-22 04:47:41,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:41,626 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-22 04:47:41,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-22 04:47:41,629 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-22 04:47:41,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:41,631 INFO L225 Difference]: With dead ends: 174 [2020-08-22 04:47:41,631 INFO L226 Difference]: Without dead ends: 93 [2020-08-22 04:47:41,632 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 [2020-08-22 04:47:41,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-22 04:47:41,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-22 04:47:41,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-22 04:47:41,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-22 04:47:41,644 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-22 04:47:41,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:41,644 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-22 04:47:41,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-22 04:47:41,644 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-22 04:47:41,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-22 04:47:41,645 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:41,645 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:41,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-22 04:47:41,646 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:41,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:41,646 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-22 04:47:41,646 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:41,646 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1589206147] [2020-08-22 04:47:41,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:41,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:43,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:43,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:43,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:43,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1589206147] [2020-08-22 04:47:43,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:43,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-22 04:47:43,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678747850] [2020-08-22 04:47:43,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-22 04:47:43,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:43,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-22 04:47:43,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 04:47:43,040 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states. [2020-08-22 04:47:45,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:47:45,290 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2020-08-22 04:47:45,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-22 04:47:45,290 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 89 [2020-08-22 04:47:45,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:47:45,291 INFO L225 Difference]: With dead ends: 178 [2020-08-22 04:47:45,292 INFO L226 Difference]: Without dead ends: 95 [2020-08-22 04:47:45,293 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 [2020-08-22 04:47:45,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-22 04:47:45,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2020-08-22 04:47:45,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-08-22 04:47:45,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2020-08-22 04:47:45,308 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 89 [2020-08-22 04:47:45,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:47:45,308 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2020-08-22 04:47:45,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-22 04:47:45,308 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2020-08-22 04:47:45,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-22 04:47:45,309 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:47:45,309 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:47:45,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-22 04:47:45,310 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:47:45,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:47:45,310 INFO L82 PathProgramCache]: Analyzing trace with hash 477506189, now seen corresponding path program 38 times [2020-08-22 04:47:45,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:47:45,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48744408] [2020-08-22 04:47:45,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:47:45,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:46,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:47:46,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:47:46,768 INFO L134 CoverageAnalysis]: Checked inductivity of 1446 backedges. 2 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:47:46,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48744408] [2020-08-22 04:47:46,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:47:46,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-22 04:47:46,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635693604] [2020-08-22 04:47:46,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-22 04:47:46,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:47:46,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-22 04:47:46,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 04:47:46,770 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 42 states.